I got tired of having to teardown the NT carb to change jets. So, I have installed a STEHL Chainsaw Carburetor, 900 series.( $15 - ebay ) Now, I have the High and Low Needle valves. This is for the fine tuning, High end tuned for running in "fat" two stroke and the bottom end "rich" for easy starts and bottom end torque. The "sweet spot" is at 70% cruise throttle. 29-30 mph.

Thank you LA. You never fail us, always on top of your game. Happy Holidays!

These make a good adapter to put a 2 inch inlet uni filter on. Use silicone to seal up the stack to the carb.

lol. i thought i thought of this! i was really bugged by that void between the stack and the carb, so i cut off the end of an old funnel to fit. was really happy with myself!! anyway, i had to jet up to 85 and wow! i too had to scrap the filter, so i went to home depot and got a foam filter designed for a shop vac, cut it to size and hose clamped it on. viola!! love your stuff LA. peace.

Love you man. Merry Christmas!

Merry Christmas and a happy new year..... I'm keeping my velocity stack on... I'll add a half rear fender and eliminate the choke....

When I've run into the seat post problem I added another seat post. Sometimes right behind the stock seat post location or an inch or two behind the stock one. Once the new one is installed then I would cut out the old one or just notch it out. Anything to get performance is how I like to play. Thanks for another good video.

Idk if anyone said this yet, but get a micro drill bit set and a soldering gun. Step up drill bit sizes till it starts 4 stroking then solder the jet shut and drill it out with the last bit size.

Excellent information, thank you. I've found that a used dryer sheet over the intake gives a measure of debris protection with little airflow hindrance. Just a thought.

Merry Christmas LA Hover! Bless you and your motorised bikes! (Also your doggo :D)

Merry Christmas hover.

Same problem i was experiencing. Wow. Anyways, Murray Christmas 🎄

Once again you made a good video and good information on motorized bicycle 🚲💯👍

@11:34 you really seem to be cruising! Good speed!

Merry Christmas from Iowa 🤘

Merry Christmas.. Every time i change something (pipe, air filter, carb )i have to down size the jet must be the difference in elevation i'm at 800 feet. Thanks for the ride along..

Let me make a suggestion. Get a foam filter from a racing kart shop. They will fit over your Velocity stack with a hose clamp.

Happy xmas LA HOVER u always have good advice no matter the rider and give good options for parts and recomendations with tested facts

One of the best channels on KZfaq!

For a filter use one of these free socked that they hand out at the shoe store

Great video! I got a curved air filter on the velocity stack with a Bofeng nt carburetor, .70mm- maybe a .80mm jet, can’t remember.. Do I need to make a adapter for the velocity stack to work? Do I need to remove the choke in the carb like you did? You were getting some amazing pulls

On camera it was hard to make out that hill! In my area it's nothing but hills! Well, the Appalachian !

Hey friend! Thank you for the very informative and insightful video! I’m very new at this hobby and have been devouring these types of videos to help me get started and maybe avoid a few snares. It took me awhile to convert this from a virtual hobby to a physical hobby...and am still breaking in the motor. That being said, I too have a clearance issue with a high performance carb and have order a set of rubber motor mounts that are designed to reduce vibrations into the frame. My hope is that by only utilizing the rear mount bushing, it will move the motor forward enough to provide clearance for the carb to clear the rear down-tube. Not really it’s intended purpose...but it’s kind of a “2 in 1” result. Any chance this may help your situation? I realize this will cause the motor to sit a little higher...but it looks like your spark plug would rise up between the two support arms.

Merry xmas!!

Merry Christmas bro

Merry Yuletime greetings , again usable, concise, practical information you pass on! Nice old school press, you reload lots?

I use the Metalmesh from a small round bluetooth speaker for a filter

I would like to see video about a zeda 80 with 50mm iron cylinder from boy go fast eBay.

LA Hover your videos always 🆒 U always get my 👍's Up. What do you think about of PZ16 carb? I'm thinking putin one on with ported jug soon. Note: I had to weld my frame back together to much vibration caused the welds to break off. By the seat, the two steel rods also the the down V tubes. Ugh! ( Good times ) for sure. I'm also impressed by the cleanliness of your machine. Be well & always ride safe. Head on a swivel!🚴

I am currently in the process of tuning a freshly built bike. It is equipped with a velocity stack, a 36 tooth sprocket, a replica mz65 pipe, and a ported cylinder (ported by myself of course) on a “BT80 Sport” engine. I am also running into the problem of possibly running the engine a little too lean. Which is a big surprise, considering most of my engines have ran rich in the past (Redding California 500 feet above sea level). I have larger jets which I will try installing in my “NT” carburetor. If the larger jets work, Then i would be happy to let you know how it effects the performance of my bike. :-)

I would like to see a viedo on how you added the reed valve and exhaust to yd 100. If you windowed the piston ect... to get it to perform.

Merry Christmas

Dmnn brother almost got yourself a 10 sec bike

Have tried the stubby intake & a small pod air filter?

I need my choke cause it gets cold in the winter so i cant use one. But cool video

How are you able to get moving from a dead stop just like that?

You want your 80cc two stroke to go twice as fast run a chainsaw plug.mine might hit 30 with stock plug but with chainsaw plug itta hit over 50 and still was pulling.ive hit 62 and was pulling but I had to stop for stop sign.mine is a GT 40 80 cc with installing my reed Valve kit or the nitrous oxide,quick easy power,I suggest you try one.

Has any one tried a ram induction set up? Facing intake into the breeze

Merry Christmas.So,do you have any tips for cheap parts that will get me to 50mph?...LOL.kidding.Happy New Year too.

Idea for a video: put an mbk malossi replica cylinder on that bike with a complete intake

So you’re telling me that for like seven years now my Stack has been incorrectly installed? Because my choke is still right where it always was... 😅

I am running the same F2, Stack, Silencer you are. What jet is working for you lately? Mine seems like it wants tons more gas. Plug is white at #80 jet.

I have jetting problems 75 is to rich but when I down jet any it gets jumpy and I have to have it on full rich to get it to run I installed a Reed and windowed piston and a high compression head and can’t get it right I was doing 40mph before this installed and it runs good but rich with a 75 man this is getting hard for me I don’t understand I guess still got the nt carb is that my problem and I have expansion chamber

Maybe you could do video about 3 or 4 base gaskets and decking the top of the cylinder to see top speed have to be on pk80 type engine wouldn't work on one piece jug engine

Merry Christmas bro. Wish our families could get together again.

maybe because de ventury efect?...i am going to order one,I only care about the looks,and the bike can take me from.A to B. thaks againg for a great video

Is the timing adjustable. Slots on the coil ?

Where u use to hill had a really big hill I just jam it and 3/4 had to pedal but yea

Could you make a v. Stack out of a funnel?

Hey you should try messing with pocket bikes. They have a lot of similar parts and are fun to ride. I know your really tall but they do make bigger ones. The one in my profile pic is very small for me lol.

You can always put it on one of your other bikes the velocity stack

So I need help. I built my fist motorized bike today on the HUFFY Cranbrook. It was running fine. Made sure all the bolts all tight and I put locktite on all the bolts. But for some reason my crank chain keeps popping off and eventually the drive chain to the motor came off at a low speed and got stuck between my frame and the sprocket. Bending a couple links and is now unusable and I made sure the chain was tight and there were verry little play. And also my rear wheel is on verry tightly but wabbles. Can you help me understand what I’m doing wrong

I always wonder if that actually does anything.

You have intake pointed up? I guess less dirt that way, but in rain you want it down?

On bike berry you can get an air filter that is by uni and is flexible if it hits your frame it won't affect air flow much Edit: it is green it will match the bike

do you know how to build a bike engine dyno?

Sup ma guy merry Christmas to you and the family 👪 ❤I definitely like the vibe and the video hey brother I have a motor I will like to ither you use for a project or I but I don't have no tools right now so let me know ill send you some pics

Do i need the Lock washer behind the nUT on the MAGNET BECAUSE MINE WASNT PUT BACK ON AND THE PERSON WHO WORKED ON IT DIDNT KNOW WHERE IT GOES??

Hi I have an 80cc Motor don’t know the brand don’t know who made it. it worked fine for months and now it only goes 10 miles an hour when I had it almost doing 45 50 can’t fugue out the problem

How did u quiet it expansion chamber? Mine is identical but is soo loud

Was your needle set at its richest setting ? Perhaps that would help ! 😎

I need jets for my stock carb on my bike, do you have and brands or websites you recommend?

Lol I ride mine with out a air box. But I live in sanded area so yeah I don’t mind.

I have a big question for you! How can i reduce the vibration of the motor bc is a pain in the ass (no joke)

Dang I can hear the difference

I used jb water weld

I have #80 and #85 jets

i'm not sure if anyone will reply on here, but my clutch arm is fully engaged and my flower nut screw is screwed in all the way and the clutch plate won't spring back in, the clutch won't engage (grab) at all, does anyone know what's going on?

I just bought the EXACT same bicycle ...color and all. Now to find a high quality engine! Any suggestions?

Any idea to get more speed out of a 53 cc 4 stroke guys?

What gap should the spark plugs be??

My bike hated it took forever to start and lost 5 mph full throttle would bog down back to back tests, took it off everything back to normal bike cranked 1st pedal and 5 mph faster…

So the PZ 70 might be the best plug n play option

has nothing to do with Video but what's better the poo poo muffler or the mz 65 muffler from Amazon I've been watching your videos pretty sure you have both of them

I just axtently bloo up my motor from over reving

Mine gets it out of the jolr

Let me send you some jets. I’ve got 75-80. I don’t use them, I have a kit with sizes 60-80. Let me know

(exspairmentle) try the ram air with the stack system or ram air cup but best research it on youtube first lol...ok ill shut up about it know------------if im wrong ill eat my own short joke

I got like number 69!!

On speed carburetor is better

Wtf kinda chinese velocity stack is that lmao

Merry Christmas