750 Cross Kart | DUAL CARB Swap + Jetting!

Рет қаралды 285,461

5 жыл бұрын

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We're still having terrible problems with our 750cc engine above 7,000 RPM- The lower 2/3rds of the power band feels great, the kart has tons of power, but when you get it under very heavy load high in the RPM range, it continues to break up and lose power. We're still chasing down the issue, so today we're drilling the emulsion tubes on the stock carburetors, and when that doesn't work, we build intake manifolds out of PVC pipe and swap the CB750 engine over to dual 34mm Mikuni carburetors.
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Пікірлер: 1 800

@jasonolson3322 5 жыл бұрын

"IGNITION!!!" I really believe you have a spark issue. Breaking up at high rpm its likely the secondary circuit of the ignition coils. I would replace the coils and throw some proper temp and gap spark plugs in. If that doesn't cure or improve even a little then cdi box or stator would be the next step. Make sure the coil ground is good as well as the engine ground. It just really sounds like the spark is falling off under high load causing the break up and limited rpm. Hope you see this and it helps 👍🏼👊

@blackice8705 4 жыл бұрын

I was gonna say the same thing. Smaller engines have the same problem at high rpm. That's why you can get a plv ignition for predator engines and have less problems getting proper spark at higher loads.

@ZippoVarga 4 жыл бұрын

My thoughts went toward the Advancer being the issue. Common issue with these older Honda engines. the springs get weak, so the Advancer isn't pulling in the spark to the optimal 18-22 degrees at WOT. Your thoughts? Zip~

@ThatEngineerDad 4 жыл бұрын

I was going to make the same comment about ignition but it still doesnt explain the wide open throttle issue to me, I do not envy John and Isaac at this point.

@CarsandCameras 4 жыл бұрын

Thank you! We figured it out😉 you'll see soon!

@MikeZ32TT 4 жыл бұрын

@@CarsandCameras Awesome. I cant wait to see that video. You guys have done so much stuff. Its been fun to watch you tinker.

@bigtony7451 5 жыл бұрын

Had a Cb, ran just like that once the mufflers were removed, I’d strongly recommend an exhaust. Eliminate that first and if it doesn’t work continue with your current method

@keystonerider1308 5 жыл бұрын

Big Tony exactly my thought too. I was searching the comments to see if someone else said it b4 me. 2x2-1 would solve a lot of problems.

@joshmoles3833 5 жыл бұрын

Agreed

@thatbuelldude189 5 жыл бұрын

@@keystonerider1308 4 into 1 would also work

@dallasfingrocks 5 жыл бұрын

When you remove the muffler restriction you'll get more airflow through the engine at top-end which means you need more fuel at top end AKA a bigger main jet

@jjecarte 5 жыл бұрын

back pressure is your friend

@pathbelow6652 5 жыл бұрын

We have a model a 2dr that is in decent shape. Motor and trans was missing when we bought it. We didn't restore it, We rat it out instead. We updated the drivability and stopping. We installed a kz1000 Kawasaki engine in this car. We mated it to a Nissan 5spd out of sentry. It took a lot of bookwork and time to make this happen. Instead of the engine/trans in side ways, we turned it inline. Where the axle shaft went in, we devised a drive shaft to the rear quickchange axle assy. The other a cap and seal. This is a fluid engine. Radiator is needed. Original fuel system was rebuilt and kept stock. Sensors and other portions were replaced before we continued. This sucker is crazy. Motorcycle engines are the way to go in small cars.

@williamstamper442 5 жыл бұрын

Been watching for at least 6 months now and finally got to where i see y'all stuff when it comes out. I looked so forward to today's video for example! Love ya both, keep it up. This is new school entertainment...at least thats how i put it!

@levelupbytyson5451 5 жыл бұрын

Have tried setting spark plug gapping I had similar problem thought it was fuel but it turned out too be spark plug gapping

@mehgusta 5 жыл бұрын

the little things matter lol

@killaz123456789100 5 жыл бұрын

I hope they see this comment

@greenmountainsuriving 5 жыл бұрын

@@killaz123456789100 I do

@crazyasspotter 5 жыл бұрын

Tighten the gaps up.

@Rocketman442-RC 5 жыл бұрын

That's true also. If the gap is too big the plug will burn too hot and unless they have a big coil throwing out a major spark having a hot plug gap won't do any good. Also needs mufflers for back pressure

@steve310t 5 жыл бұрын

There is another guy on you tube called, Classic octane. He is always working with these old honda engines. I know in alot of his videos he runs the carbs with pod filters with no issues, he also says what jets he is running. May be worth it to check out his stuff for some tips

@preez77 5 жыл бұрын

Steve Godfrey He runs older mechanical slide carbs, not CV carbs. It’s not as difficult to dial them in

@MrGixxer1300r 5 жыл бұрын

he also know what he is doing, and not drilling jets and crap like that.

@billcohnen6326 5 жыл бұрын

Also, Put an exhaust system on it, these small engines require a certain amount of back pressure to create vacuum.

@TangoOne 5 жыл бұрын

Thats a myth. only 2 strokes require back pressure.

@LemmingGoBoom 5 жыл бұрын

4 stroke engines create vacuum on the intake stroke, as the only path for air into the cylinder is through the intake valve and thus through the carburettor. No exhaust pipe needed.

@rarbaugh07 5 жыл бұрын

Back pressure is a myth in all engines, exhaust velocity is what you want.

@tebibyte2357 5 жыл бұрын

@@rarbaugh07 Two strokes hate you

@MrCrazyking81 5 жыл бұрын

We all hate 2 strokes so we are even

@ErvahNoir 4 жыл бұрын

I have a 71 cb that I'm looking to get running again so all of these videos are not only entertaining (because cross-kart) but informative as I still have some tests I need to run on that motor. Keep it up guys!!

@batsoupbukake7057 5 жыл бұрын

"It'll be fine" when you add some mufflers...just sayin...

@safetyboots2642 5 жыл бұрын

Was thinking about that. For grind hard plumbing co it sorted out their 450. I know its not the same by any means but sometimes the silly things end up being the culprits.

@luccaspenceley2366 5 жыл бұрын

@@safetyboots2642 grind hard had a baffle stuck in their pipe which was stopping air flow.

@jackmehoff2961 5 жыл бұрын

my thoughts exactly, need back pressure.

@Xer0Hypnotic 5 жыл бұрын

i was thinking the same thing

@derschwarzgeist 5 жыл бұрын

@@jackmehoff2961 No, you don't need back pressure in an exhaust system.

@khrprod 5 жыл бұрын

use a digital laser thermometer or thermal camers to see which one of the headers are hot and wich not. that way you could see which cylinder is lean and which one rich

@leskobrandon538 5 жыл бұрын

Harbor freight has em cheap

@liljohnp132 5 жыл бұрын

A squirt of water on the header tube can tell you alot.

@gooblio 5 жыл бұрын

That's how i tuned my old 750 four SOHC , I put a set of smooth bores on it, but it wasn't breaking down ever like that, it would still rev to red line. But it's a great way to set your jetting and not be too lean or rich. I'm afraid these guys are going to cook a valve or piston with all the playing around with the carbs. I'm thinking it's not a carb problem at all. I think another problem is no exhaust back pressure.

@leskobrandon538 5 жыл бұрын

I'd check the ignition coils, plugs and wires, it sounds like one of the coils secondary winding is breaking down.. and the stock carbs are filthy, soak them in some gumout in a ultrasonic cleaner...

@khrprod 5 жыл бұрын

@@gooblio yeah

@Buck1954 4 жыл бұрын

I like it! It's a step closer. Love the PVC piping. Work out the ignition next. Then go back with messing with the fuel. I always hated syncing those carbs.

@michaelwoodsdale460 4 жыл бұрын

Oh man - how happy you guys were to fab intakes out of PVC...that’s the stuff that makes this a favorite channel 👍🏼

@hicksvilleshick 5 жыл бұрын

Whats up with the right front wheel trying to live stance life??? Ya'all tree it already??? lol

@ChrisEsposito 5 жыл бұрын

Looks like he damaged the right front wheel... Looks like it has way too much camber now

@Lance_59 5 жыл бұрын

ChrisEsposito I was gonna say something about it I noticed it and was about to comment before I saw this

@geecee4 Жыл бұрын

The good fortune of them having John’s father (and mother), such a great father, a) to have the means and b) being nice enough to allow the use of his yard and garage for all of this is simply amazing.

@eriknulty6392 5 жыл бұрын

EXHAUST, grind hard plumbing had a very similar issue. they ended up buying a new motor only to find out it needed a factory spec. exhaust system. sometimes uncorking something isnt the best idea. they said it was there most expensive easy fix. lol

@DeliciousDeBlair 4 жыл бұрын

Typically exhaust issues are more of a 2 stroke problem... Not always, but most of the time. What would be right on for a 2 stroke COULD cause an exhaust problem for a 4 stroke though...at certain speeds and tube lengths.

@Steelythestacker 4 жыл бұрын

I saw that GH vid and their motor was sounding more like it wss chetting choked where CC's issue sound s more like it scatters when the rpms get up.

@nothingtoseehere4026 5 жыл бұрын

Dead set on keeping that eye poking phallus, huh?

@byron7165 5 жыл бұрын

When John loses an eye over a huge bump, they'll cut that thing down to a reasonable size and put a knob on it. Not before. You can't tell these guys anything at all. How long have we been on them about _trying_ a muffler? Engines are designed to run with specific air box and exhaust restrictions.

@motomatt6099 5 жыл бұрын

He said he couldn't get the butterflies lined up. With a Honda thats everything.

@braapmoto9268 5 жыл бұрын

Nothing to see here “it’ll be fine”

@nothingtoseehere4026 5 жыл бұрын

@@braapmoto9268 No doubt. That's why we have two eyes. 😜

@braapmoto9268 5 жыл бұрын

Nothing to see here one is none, two is one👍🏻

@ruubjumper126 5 жыл бұрын

Too smooth intake runners or ports wont make an engine run that bad. Too short exhaust or air filters wont either. Maybe the problem is in the engine itself. Maybe test compression and valve clearance first. Carb should be fine with stock jets if everything is proper. Good luck

@modifiedunlimited8028 5 жыл бұрын

Absolutely perfect guys this is test and tune :)

@todorow22 5 жыл бұрын

Time to invest in a wide band O2 sensor. Specifically to debug situations like this.

@CarsandCameras 4 жыл бұрын

Good idea, we just got one the other day!

@lawrenceveinotte 5 жыл бұрын

i have a feeling its a valve clearance issue, also i'd check the compression, check the timing with a light, i think it should scream with the dual carb setup.

@Fontanamotorsport 5 жыл бұрын

i agree, many years ago i saw the dual cam 750/900 engines with valve clearance issues, to the point of burned valves...

@pkuudsk9927 5 жыл бұрын

I said the same thing 3 days ago the valves tighten up over time holding the intake open, causing back pressure in the carbs

@fofosu 5 жыл бұрын

rory fontana .

@fofosu 5 жыл бұрын

Fell. Asleep with my hand on the keyboard, sorry!

@andrewfortier88 5 жыл бұрын

I agree 100% I have an 83 gs850 that ran that way too long and burnt the valves. I checked clearance and it was less than none. Made it 45,000 miles tho.

@Vintageguy73 5 жыл бұрын

On the old SOHC 750's, the coils were notorious for going bad.

@tommarkovich6720 5 жыл бұрын

Guys. Get a infrared temp gun. Test each exhaust tube right off the head and that will let you know which hole is running rich or lean. Synch the air then start checking exhaust temps. High lean low rich.

@Chris-yy7qc 4 жыл бұрын

Or buy a cheap wideband instead of guessing...

@CarsandCameras 4 жыл бұрын

We figured it out! It wasn't the coils!

@fidenziogarza1388 4 жыл бұрын

@@CarsandCameras what was the issue?

@nielsenl4171 4 жыл бұрын

That's not a SOHC that's a DOHC sohc didn't have diaphragms on the carbs

@ProlificInvention 5 жыл бұрын

THIS IS WHY I WATCH!!! Great video guys.

@cesarpena1392 5 жыл бұрын

Yall inspired me to make my channel where I make videos on all kinds of small engine vehicles. Keep up the good work guys. Great videos.

@EdWolfram 5 жыл бұрын

Time to start checking timing and spark quality. One of your setups should have been close enough to run it into high rpms. I had a 850 Suzuki that had a junk stater was just putting out weak spark spent all winter fooling with carbs.

@TheGreyTest 5 жыл бұрын

To me, it sounds like the ignition timing is out when it gets to the higher rpms. Do these engines have anything that automatically advances/retards the timing in relation to load/rpm?

@TheGreyTest 5 жыл бұрын

Oops, that post was supposed to go in the main comment thread. 🤦🏼‍♂️

@jeffrey717 5 жыл бұрын

Boys, 1 and 4 are most likely lean. "Y" the intake manifolds for even delivery. And yes, get some mufflers on it.

@jakeds84 5 жыл бұрын

You guys are awesome. It's so fun watching your KZfaq channel channel.

@jacobdunne571 4 жыл бұрын

Absolutely crazy machine keep up the good work can't wait for more, love it 🤘🤘

@jacobford5529 5 жыл бұрын

Sounds like you should put some kind of exhaust probably doesn't have enough back pressure

@brettcanosa3601 5 жыл бұрын

The guys from grindhardplumbing had the same issue with a 450 kart. As soon as the exhaust went on it ran like a champ.

@LemmingGoBoom 5 жыл бұрын

@@brettcanosa3601 That was taking the exhaust off... they took the baffles out of the exhaust and REDUCED the back pressure not increased it.

@MegaKencam 5 жыл бұрын

I'm with you. I think you are not getting a proper spark at high RPMs. I do think you need to redo the compression check and have a look at your plugs. If it's running lean at high RPMs the plugs will tell you. I love the dual carb setup. Getting rid of those CVs has to help. Just fab up a proper Y shaped intake.

@williamstamper442 5 жыл бұрын

Coil gap

@Vintageguy73 4 жыл бұрын

Anxiously awaiting next episode!

@mblizzy 4 жыл бұрын

Man that thing is sooo sick! I still can’t believe how awesome this thing came out. Great work boys! By far my favorite build so far. I’d take this over a quad I think.

@Archermboi 5 жыл бұрын

I don’t see a issue with the dual carb pvc intake ( hit the inside of the runners with some 36 grit) I feel it’s a ignition issue for sure

@butchs.4239 5 жыл бұрын

Depends on whether or not the fuel is melting the PVC. If not I'd prefer a setup where the intake runner length is mostly the same, with the current version the inner two cylinders have a straight shot from the carbs while the outer two have two 90 degree bends between the intake ports and the carbs. There's no way the flow between all the cylinders is balanced.

@phoenixeragon6404 4 жыл бұрын

@@butchs.4239 if they put the carb between the two then put 45 bands it would probably be better

@butchs.4239 4 жыл бұрын

@@phoenixeragon6404 Exactly. Issac made the comment about having to support the carbs if using a long runner y-pipe intake. I'd agree with that, but if they're trying to keep the runners short and the carbs close to the motor they need a T fitting and two 90 degree elbows similar to how they did the single Mikuni intake. That way the runners are close to the same length, and each has a bend in the airflow so the cylinders should be well balanced.

@mitchthompson3246 5 жыл бұрын

@15:54 I swear it sounds like one cylinder has no compression while you are turning it over. Have you done a compression test?

@josteincarlsen2905 5 жыл бұрын

Mitch Thompson or spark ⚡️

@Grungydan 4 жыл бұрын

Guys, the "horror music mad science" sequence is the best thing you've ever done from a production/art standpoing. Fantastic! :D

@CrazyWillification 5 жыл бұрын

Amazing build and congrats on 700K. 1M right around the corner.

@CarsandCameras 4 жыл бұрын

Thanks!!

@allenmckinney9533 5 жыл бұрын

Look into a full size fuel filter for a car that will last longer than a little Briggs filter.

@danmackintosh6325 5 жыл бұрын

Personally with gravity feed I'd prefer a strainer/screen or sedimenter setup over a "proper" filter since they can be so restrictive to flow. At the end of the day, you're in control of what you put in your tank & clean fuel in = clean fuel out.

@MTFT_atomicgarage 5 жыл бұрын

Maybe some turbos will help?!?!?🤔

@aidenhopkins4421 4 жыл бұрын

Maggie The Farm Truck I was thinking 4 😂

@MTFT_atomicgarage 4 жыл бұрын

Aiden Hopkins would be awesome, but what if they do dual carb/dual turbo set up🤔 that would be sick.

@aidenhopkins4421 4 жыл бұрын

Yup bit a nitros to 😂

@CarsandCameras 4 жыл бұрын

DEFINITELY

@hommyy-c5494 3 жыл бұрын

they should try to find gpz 750 turbo it would rip

@shark11175 5 жыл бұрын

Amazing editing

@kennethdispain1807 5 жыл бұрын

can't wait to see that bad boy full throttle love watching you guys

@Jacksonkellyfreak 5 жыл бұрын

Gotta put the mufflers back on it. They're tuned with the airbox and mufflers installed. Open pipes tend to lean em out.

@disabledede1818 5 жыл бұрын

Get pods for each carb and tape them 3/4 the way up and it needs the muffler for the back pressure

@duckytheduck3127 5 жыл бұрын

Back pressure hurts performance. They need headers for the exaust from one cilinder creating a vaccum and pulling the exhaust gasses faster from the other cylinders.

@killaz123456789100 5 жыл бұрын

But with the muffler off it should still go to full 9500rpm the pods might be on to somthing there

@ruubjumper126 5 жыл бұрын

@@duckytheduck3127 Wont make the engine run that bad.

@flhusa1 5 жыл бұрын

@@duckytheduck3127 cutting out at 3/4 throttle hurts performance

@redneckswitwheels 5 жыл бұрын

@@duckytheduck3127 u sir have no idea about anything

@jeffyates4813 5 жыл бұрын

Geez Isaac you look like a mad scientist cutting the pipe.

@mowler8042 5 жыл бұрын

All the vintage Japanese bikes I’ve owned had carb issues and if I was smart would have bought new ones for all the hassle they were. Your mods make it look scary fast

@TheGingerJonny 5 жыл бұрын

It sooooo sounds like coils/cdi :) awesome though!! Love your stuff!!

@christiantorres5282 5 жыл бұрын

Nice video havent watched it keep it up

@ejs6097 4 жыл бұрын

Can't remember if you guys ever did a compression test...? I call this a success at the end of the day fellas! No good idea was ever proved or disproved with out trial and error being involved... I also wanted to take a quick moment to say that everything is really looking and functioning very well! You guys went from chassis build, to trying to get this engine configured into the cart so fast, that i don't feel like you guys were payed homage on how well your guys cart is actually working! Well done!

@billcohnen6326 5 жыл бұрын

Great video, Awesome creativity, keep the dual carbs, replace ignition parts and new plugs as well. Making sure the gap is correct. I love the crosskart, makes me want to build one.

@matthews852 5 жыл бұрын

Can the guy in the hat please say “damn it Bobby” in the next vid. Thanks.

@TheBunnyDeveloper 4 жыл бұрын

That's ike

@brandons.9731 5 жыл бұрын

I had a similar problem with a 86 Honda shadow I had a few years ago and it was the coils just not firing hot enough

@CarsandCameras 4 жыл бұрын

Ours are still original, but it turned out to not be coils!

@ihatejoze 5 жыл бұрын

Man I loved that mad scientist montage!

@holysavage6548 5 жыл бұрын

You guys really inspire me to make my own go kart!!!

@patsguitar5187 5 жыл бұрын

Issac: We need to get a heat shield going on this thing *3 episodes later* Issac: I think we should put a heat shield on the kart

@cole33333333 5 жыл бұрын

When you were synchronizing the carbs on the last video one had a fluctuation. valve, tappet, flat cam lobe?

@ratman5727 5 жыл бұрын

I also noticed that..

@sweeneysweeney1901 5 жыл бұрын

I like the dual setup. Looks awesome . Lets see where we go from here

@chrisburns7036 5 жыл бұрын

It goes like hell boys!👍

@djohnson1110 5 жыл бұрын

You are running straight pipes. Zero engine back pressure. Could be several small problems together

@alt7488 5 жыл бұрын

back pressure is a myth ...just ask uncle tony

@zethloveless7238 5 жыл бұрын

Al T back pressure on cb750 is not a myth. Try doing homework buddy

@alt7488 5 жыл бұрын

@@zethloveless7238 lol...well it seems to work on top fuel dragsters ...among other things

@zethloveless7238 5 жыл бұрын

Al T taking off stock mufflers on a cb750 can cause it to run lean. Would need to add more fuel. Not saying you can’t run straight pipe you just need to address the problems it causes

@alt7488 5 жыл бұрын

@@zethloveless7238 wow...so upping the jet sizes will fix that ...and it seems to have solved the problem didn't it ...get a fucking grip adding a full exhaust won't solve the issue ..the issue is more likely ignition let the boys fix that before filling thier heads with stupid redundant ideas

@kenmullins8176 5 жыл бұрын

Sometimes an engine needs a little back pressure with the exhaust. Just saying

@jofishisawsome 5 жыл бұрын

Ken Mullins back pressure is a myth, just needs headers that are a good diameter for that motor, it’s not much displacement so a small diameter pipe would allow the exhaust to scatter better

@Catholic647 5 жыл бұрын

I love it Isaac the mad scientist the music is so glorious keep up the good work guys I love the gokart it is sick!!! ✌️

@1775bobcat 5 жыл бұрын

I remember watching an episode rather B welding, he was having troubles with his engine with the new build as soon as he added dual exhaust the motor was happy as hell

@Extrmmitch 5 жыл бұрын

It's the Venturi effect. If you made a plenum (chamber) for the carbs to filled and plumed from the chamber to the intake ports. you won't be robbing the two cylinders of air & fuel on high revs.

@hunter100t 4 жыл бұрын

is that a round about way of saying it needs a common rail.

@CarsandCameras 4 жыл бұрын

Good point, I'm making steel manifolds for it

@Extrmmitch 4 жыл бұрын

@@hunter100t It has Carburetors not a fuel injection system, The two cylinders inline with the Carbs on high revs will suck the air flow backwards from the two outside cylinders because rapid air & fuel passing through the T fitting causes a vacuum. It's a Venturi valve. So to be able to stop the carbs playing favorites with the cylinders, a space between them needs to be made. That Fuel & air can mix around and fill. The cylinders can pull from the space when they need too

@Extrmmitch 4 жыл бұрын

@@CarsandCameras Are you still thinking of what you can build with Yamada 18hp diesel engine? It should have tracks.

@sunsetsportbikes9435 5 жыл бұрын

I'm no expert butt.... the free flowing exhaust (no mufflers) the high flowing air filter pods or your air box, youll need aftermarket jets. bigger mains and pilots. I'm sure dyno jet still makes a jet kit for it. I had a 95 fzr1000 with the same problem, breaking up in high RPM

@scottwarren1226 5 жыл бұрын

I am an expert butt...

@kaisantiqueengines569 5 жыл бұрын

Congratulations on 700k subscribers

@theirishaxe9405 5 жыл бұрын

Hey guys just wanted to say congrats on hitting 700k you guys deserve it 👍 please make a mean sized crawler!

@bolsen1981 5 жыл бұрын

hey Isaac. 3:40. you missed a hair while shaving :-D

@MegaKencam 5 жыл бұрын

Been there, done that...

@LittleMikeStarCraft 5 жыл бұрын

lol saw it too

@pterodox123 5 жыл бұрын

I like it,,,,,,,,, looks fashionable.

@devicemechanix9049 5 жыл бұрын

Saw that too. Lol

@charliewolf7500 5 жыл бұрын

I was almost yelling at the screen, from the first time I heard it run. "Weak spark". Other than that, I liked it. Thank you for the entertainment.

@jbncnow 5 жыл бұрын

I totally agreee

@caseybrunson541 5 жыл бұрын

the poor spark plugs are prolly killed with fuel

@robinward3003 2 жыл бұрын

Run your engine with a new spark plug for long enough to warm up, and run it at the rpm range your testing for, shut it off and remove the spark plug. the color of the residue will tell you for sure, if it needs a larger or smaller jet. This method of tuning is old-school, but it works. One more thing I wanted to say about tuning is that unless you have increased the cubic inches by boring out the cylinder, or a longer stroke crank, changing to a larger carb to increase power usually has the opposite effect because the larger carb will have a lower velocity air flow, which screws up all your jet settings, and causes dead spots between circuits. Hope this helps, love that 750, don't over-carb it, your best build ever. PS like to see you put a predator212 on a mountain bike, and see how close you can get to motorcycle performance.

@fofosu 4 жыл бұрын

I really enjoy all of your videos guys. Keep up the good work. FWIW, I think that 750 has a spark problem, good luck.

@mybackhurts7020 5 жыл бұрын

Mario kart is looking great

@22Steez 5 жыл бұрын

two aspects: let a dude print the intake of a 3d-Printer... it works great! the right front wheel has a lot of camber!

@Turbochargedtwelve 5 жыл бұрын

You need someone who can print in a material that will cope with heat and fuel exposure. Nylon 6-6 works.

@22Steez 5 жыл бұрын

@@Turbochargedtwelve we used PLA and it worked great. I would try to support the structure with some feet caused of the mass of the carbureto. We have a 19mm carburetor mounted with pla with a lever of 100mm without support and without problems moving the bike off road

@Turbochargedtwelve 5 жыл бұрын

22Steez PLA will melt in the sun on a hot summer day.... it’s good “for testing purposes” bu I wouldn’t expect it to last long.

@curtism7203 5 жыл бұрын

@@Turbochargedtwelve Exactly, PETG is better suited for chemicals and heat not to mention its stronger

@drift_boi2843 5 жыл бұрын

Lol i am not the only one who noticed✋

@maxbelikov3571 5 жыл бұрын

great project love it just thinking you might want to look into a Y pipe to split both carbs. As the T fitting helps the middle 2 flow as the outer carbs get less air. This becomes more pronounced in the high revs

@gregmyatt9932 4 жыл бұрын

Coils and leads guys. Check cam timing aswell this can also put timing out and restrict air flow. This old 750 were known to skip timing on cams especially with some miles on them at high rpm. Put the old carbies back on with standard jets. Check the idle ports in old carbies and float levels. Some back pressure would help too.

@justinhunt5370 5 жыл бұрын

Pull the plugs out you’ll see if your to lean or to rich

@KCbuffalo 5 жыл бұрын

Justin Hunt it’s like people don’t understand how to read a plug. Put some fresh ones in, run it at full throttle and pull the plugs to see if you’re lean or rich 😂

@colossebdumont879 5 жыл бұрын

I must say, one of your videos is a very nice birthday present for me ! Turning 16 today !

@propaneandpropaneaccessori3446 5 жыл бұрын

Enjoy the next two years

@isaacitllbefine7231 5 жыл бұрын

Happy birthday

@colossebdumont879 5 жыл бұрын

@@propaneandpropaneaccessori3446 ty man XD

@colossebdumont879 5 жыл бұрын

@@isaacitllbefine7231 the man himself responded to my comment, well fuck now it's an even better gift !

@StupidTeenageVideos 4 жыл бұрын

I love the music playing while Isaac is making the intake! Lol

@Mustangfleming 5 жыл бұрын

Check the timing and the clearance on the points. they might need some fine tuning or they could be getting weak and need replacement. My 1979 gs850g had this problem and it fixed my issue.

@MD-bk7kb 5 жыл бұрын

You must have the most understanding neighbours on the planet......I need to get me one of those, do you make them to order? Ship to the UK maybe?

@rcplayer7581 4 жыл бұрын

Word

@Chris-yy7qc 4 жыл бұрын

True. My neighbor is yelling at me because Im watching cars and cameras videos too loud in his opionion. lol

@rcplayer7581 4 жыл бұрын

I got to fight my neighbor over a rc truck lol

@rcplayer7581 4 жыл бұрын

I got told my yard not a stadium its a residential neighborhood tired seeing flying rcs out his Windows

@CarsandCameras 4 жыл бұрын

Hahaha we do have AWESOME neighbors

@DocumentaryHub 5 жыл бұрын

For the forth time.... IT NEEDS A GOD DAMN FUEL PUMP!

@hunter100t 4 жыл бұрын

maybe maybe not, are you sure, you don't sound convinced lol

@DocumentaryHub 4 жыл бұрын

@Skott at high RPM gravity isn't enough to fill up the carbs. The bike this engine came from has a fuel pump originally.

@Onemattressatatime 5 жыл бұрын

Crazy sick wonderful

@Shishkahn 5 жыл бұрын

Wow, you guys blew up! GJ!

@dirtpro4142 5 жыл бұрын

Front right wheel has a lot more camber then the left

@drift_boi2843 5 жыл бұрын

I know right 😂???

@feeterican 5 жыл бұрын

Is it me or is the right side front wheel Cambered (bent) out more than the left?

@seanclay4188 5 жыл бұрын

Epic love the video

@ricooo3159 5 жыл бұрын

It shoots flames😂 I love it

@felixfischer4947 5 жыл бұрын

It could also be the exhaust You have to weld two pipes togehter into one so they could help each other to pull the gases out Just like a Xpipe in a car exhaust

@swandonovan 5 жыл бұрын

Remember, I work at eBay's largest used motorcycle parts dealer, MRC cycle, and offered to sponsor you. We've got TONS of engines

@DeliciousDeBlair 4 жыл бұрын

Are they AFFORDABLE...? ~( ,m,)~

@rcplayer7581 4 жыл бұрын

You guys buy enginges i have a trx 450

@mathdebates7936 4 жыл бұрын

Have any 50cc 2 strokes of parts? I'm cooking up something crazy.

@swandonovan 4 жыл бұрын

@@rcplayer7581 not really

@swandonovan 4 жыл бұрын

@@mathdebates7936 moped or shifting?

@thomasbarnardjr9657 5 жыл бұрын

Add some exhaust, check the spark plugs, the gap and the overall condition of them. Coils could very possibly be the issue, but it's not really likely given the symptoms. If the coils were going bad, it would usually start breaking up almost immediately upon acceleration... especially once the the engine gas gotten hot. The same can be said for the ignition modules. Keep in mind, I'm no expert, but in my experience that has been the case. And usually it's the simplest things like not having that exhaust, or having fouled or dirty plugs that can give you the most fits. Good luck. I love the build so far.

@troycrowder9942 4 жыл бұрын

i have had the top end cutout like that on the hondas it has turned out to be simply one field wire broke on the charging mag and the only time it cut out was at the top end i always thought it was carbs but i found the wire turns out the early hondas that problem its just not talked about a friend of mine at one time was rated to be in the top ten honda tecks in the world and he is still the best i have ever seen he is the one that put me on to the short i the charging mag

@justinchain1668 5 жыл бұрын

Also good job guys, oh it might be timed wrong on the higher end of the rpms

@killaz123456789100 5 жыл бұрын

Also a thought of mine.. could be slightly pre det at top end

@justinchain1668 5 жыл бұрын

FunkyQuetzalCoat126 yeah, but pinging sounds different and if it is using an older coil then it could missing at a higher rpm, I’m pretty sure my moms rm 85 does the same thing in mid range

@killaz123456789100 5 жыл бұрын

@@justinchain1668 so throw a new coil on it and some fresh wires ect?

@justinchain1668 5 жыл бұрын

FunkyQuetzalCoat126 not yet

@killaz123456789100 4 жыл бұрын

@@justinchain1668 yea dude just put a new coil new wires ecu on and on they will get it eventually

@ronaldseabury734 5 жыл бұрын

It's running on three cylinders you've got a bad coil.

@Chris-yy7qc 4 жыл бұрын

You could really tell 1 cylinder is not running right when it first ran with the 2 carb setup, sounding like a harley. Bad secondary circuit (for high rpms) on at least 1 coil...

@CarsandCameras 4 жыл бұрын

Turns out it was actually running on TWO cylinders at times

@jgoopra 4 жыл бұрын

@@CarsandCameras ignition module or pulse generator?

@robbovius 4 жыл бұрын

Guys, yeah, ignition. I had exactly the same problems with a Yamaha xs850 - breakup over 4000rpm - and it turned out to be the old original ignition coils failing. I swapped in 3 Suzuki samurai coils, that was in 2010, and its run great ever since. Try it, trust me.

@teltwosheds2972 5 жыл бұрын

Ok guys great vids. You need to chuck some mufflers on it, or go way over on the jetting- though you will push the flat spot to mid range wth the bigger jets. Keep up the good work.

@ps3joey6583 5 жыл бұрын

The old carbs are most likely fine they just need bigger main jets there’s to much air not enough fuel

@shark11175 5 жыл бұрын

Its 2 rich

@juttdavies5643 5 жыл бұрын

Sounds like spark the way it's braking up on the top end

@CarsandCameras 4 жыл бұрын

Ding ding ding

@justinc8638 5 жыл бұрын

Awesome build guys! upgrade those coils that's spark is breaking up

@minibikeaction4266 4 жыл бұрын

The PVC pipe is brilliant!

@patricktolmie6985 5 жыл бұрын

Hey guys Isaac and whatever try changing the spark plugs NGK racing plugs

@losi8ightyew 5 жыл бұрын

Yeah, my cb750 nighthawk is super picky about plugs. the standard NGK copper plugs work best. Iridiums don't throw a hot enough spark, copper cores are best.

@peytonyoutubee 5 жыл бұрын

C&C: (goes offroad) (doesn’t get stuck) Me: how?

@safetyboots2642 5 жыл бұрын

As Jeremy Clarkson would say... MORE POWERRR!!!

@stevemaccollum4688 5 жыл бұрын

I can’t wait until you get the engine to run on full throttle so you can get onto adding paddle shifters. Lol. My lord that shifter looks bothersome. Keep up the good work guys. This stuff is gold!