Yeap, the transmission did it's thing a lot better than I thought it might. What a screamer...51 MPH that close to the ground has got to feel like 100 in anything else.

It shifts better than I thought it would. The drive pins act as a synchromesh to get the sprocket hubs up to speed. Pretty cool!

damn never expected it to work that well, good job man!!

Find 'em and grind 'em, still an awesome setup nonetheless, makes me want to try and build one

Back in the day, Heathkit used to sell a 2 speed minibike with a similar shift but it was really lightweight; it could only be shifted when not moving. This is a great build ! My suggestion is to rubber mount the shifter. On motorcycles they have rubber in the back wheel to take the shock of shifting.

Nice video and really cool transmission! I think you should just add a mechanism to fix the shifting lever in the three different positions. (1st, 2nd & neutral) You could do it simply by adding a spring that pushes the lever in a grooves on a vertical plate.

Great video. On the issue of a two speed mini bike I used to have a fox that had a two speed. The way it worked as that the engine was fixed with two centrifical clutches that engaged as different times. When it got to the speed that the second clutch would engage the second over ran the first and there was a one way bearing on the jacks shaft that let the first run freely. I believe there was also a one way bearing on the second that the first gear would use when the second was not engaged. Was a real cool system and compact. Just thought I would share.

Good job on the shifter setup! Shame about the torque converter, I'm sure you can work it out though. What you should really look into for your karts is caster and ackerman angles. Caster helps autocenter at speed so your steering isn't so jumpy, it'll always return your wheels to straight forward. Ackerman angles has to do with your steering arms on the spindles. They should point towards the center of your rear axle. They just help with your turning radius. With the correct ackerman angles, on turns your inside front wheel should turn sharper than your outside wheel. Just some suggestions.

11:04 good thing you shut it down. Those little weights cause alot of damage when they fly off. Don't ask me how I know!

good work bro....i think no one can hate your work brother.....u explains in the much understandable way...

I was expecting to the 1st gear chain to come off.

Very good job man, I'm planing to make a 2 speed bike with belts. Do you have video how you made the gear system?

Love it! An ingenious design. Back in the 1970's Kawasaki sold a trail bike with relatively low power that was compensated with a 2 range transmission. It had 3 or 4 regular gears, but when stopped, you chose high or low range depending on the type of riding you planned on doing. Low for trails, etc., and high for on road for top speed. That is the only way I could make sense of you using an infinitely variable transmission (that shifts automatically) with a 2 speed transmission. No disrespect, because it is an awesome design and well carried out, but other wise, with enough power, you don't need 2 transmissions. A simple centrifugal clutch would also work well for shifting a 2 speed and might be even better (simpler).

What might help, is to bevel the leading edge of the receiving holes, so that the pins are already below the face of the discs, by the time they are directly over the holes.

Awesome work. Been thinking minibike the whole time too. Looking forward to your next build with this limitless potential.

Amazing. Just add some idler gears to stop the chains flapping and you going a real good gear train. Look up "dog clutch", it's the same idea as your prongs and holes system but more robust.

Fuggin love this channel!!! Great work man keep it up!!! So badass!!

GREAT JOB....... DON`T LISTEN TO THE HATERS. KEEP DOING WHAT YOU DO.

Put some spring pushed friction plates that spline with the transfer wheel. Could make shifting alot smoother by acting as synchronizers.

That was awesome man!!! That two speed worked beautifully and I love that camera angle by the way. The test drive was a little long but man pat ur self on the back. That was a huge success!

I seen this done before with the transmission being it on unit, you did a great job on your design by using one less shaft and bearing. less moving parts means more power to the tires. Good job

So imagine if your rear tires were 4" taller ! Your speed would be perfect ! I looks to be a fun cart I will have to look at the build video again and see how you made it ! 2 Thumbs up ! Maybe try a heavy duty spring to keep it in gear ! I think that you really have a winner here now if you could figure out a reverse gear to go with it ! Can you do a video just on how you made the 2 speed with the torque converter that is in iits self a two speed so you really get 4 speeds on paper any way ! great idea !

Ive been following your videos for a few years now and dude your getting better and better hell my uncle subscribed as well

You're thinking,planning,building and learning. Awesome keep it up young man!

excellent design and workmanship !!!! chains need some tightening maybe try a HALF LINK if the chains sprockets or shafts can't be moved... on the device that comes un done possibly use locktite on it, failing that you could try left hand threads re thought - you could use safety wire to lock the bolt in place much easier / simply drill a hole thru the bolts head and a hole thru something else to wire the bolt too . the slider on its shaft, possibly use 2 or 3 keys / key ways, giving more longevity / strength.. excellent keep up the great work. used to do this kind of stuff in another lifetime.. you make me proud brother ..

Awesome job man !! Everybody needs to realize this was it's first test drive. I'm sure hes gonna adjust the chains and do many tweaks. If you watch the previous video he pretty much freehand engineered it. Just grabbing pieces of metal holding it where it looked good and welding it just to test and see if the transmission even worked.

That works much better than I thought it was going to. Good job!

Looks great only one thing I would do differently is tighten the chains

Great job. I believe Northern Tool has a little rack and pinion that would work for the steering .That might make it a little less sensitive, but still give a relatively fast response, just a little more turning of the steering wheel.

That thing works really good. I wasn' t expecting that. You have got a winner there. You are right, a minibike with that trans would be killer.

Why don't you all relax and give the dude some credit'.He said it would go faster.To me that's fast enough with a twitchy steering.But it should go faster like he said.By the way,lets see all your builds..........Yeah Thought So!

Very nice and simple design that worked. liked it very much. keep up the good work.

I've followed your transmission build. and I'm impressed. Nicely done.

Man I love it hahaaa you're crazy but it's good to have confidence in even the most thrown together go kart hahaaa great stuff :)))

Wow that’s pretty ingenious! I build all kinds of crazy/wacky stuff myself but that trans is really cool!

You should make some kind of synchronizing ring out of rubber or something

Not to say I was thinking it was going to be a failure because I am VERY impressed with how well it works. You could play around with different tire sizes. You made it this far. You can figure it out and make it work. Good job and and nice video! 👏👍

Very well made. When I was younger we just used the secondary and gear case off a bombadier snowmobile, and ran a yamaha two cylinder 399 engine. We achieved speeds of about 50mph, but the torque was where the fun was at. The only thing that I really hated was the solid rear axle. Next time I'll use a rear differential so we can turn much nicer. Good video though!

Dude..that's insane..haha..looks like a great project..nice job ..keep safe so you can keep posting videos of all your cool project..there exciting to watch..thanks for posting

This is freakin awesome nice job man btw can’t wait to see more videos on the dune buggy

Looks like some fun roads to drive on, lots of curves. 2 speed without a clutch is awesome.

Pretty cool cart there! i machine a lot and this gives me some idea's for my buggy i have!! I like the build video where you show how to mill the parts for the 2 speed system, You ought to take a look at the first gear chain and take one link out of it as there is far to much slop and play and at high speed it could catch and bind the gears. Still...it is an epic build and nicely done!!

Congratulations on your success, it takes a lot of thinking and will to achieve things , keep it up you will make great things

Ace! NOW TURBO IT 😂

Cool project, it reminds me of the way dog boxes are made. To make the shifting easyer. You could have your "dog" engage into slots that are larger than the pins, so that when you shift it's more likely that the pins will hit a hole than skate along the plate, the only problem with that is that you add extra lash to your drivetrain, just a suggestion though, and super cool. Is it a waist of time? only if you didn't learn anything doing it.

Hey you figured out a " Crash box!" Lots o fun!!

Hang on a minute, you have effectively added high and low range to an infinitely variable transmission to begin with. Nice work you do BTW.

Awesome ! Glad the converter came off at stop.Wouldn't have found it all if at speed.REally Great build>Thanks for showing us.

That's pretty darned smooth.

That's an awsome build bro...great job. You have a really nice work shop.!!

Very interesting, i watch you fromage France still 6month you have really good ideas i love your videos👌🏼

Cool idea seems to work well to lock it in first or second move the pivots of gear lever together so when in 1st it goes over center forwards then second is over center back

Your 2 speed trans design is elegant and simple. I think it has a lot of potential. It might be easier to shift if you made slots instead of holes for the bolts to catch in.

Do you have any tips on how to tackle the sensitive steering issue. I have the same problem with my karts rack an pinion setup. Only way I can see is to increase the size of the pinion sprocket??

works better then i had expected and no where near as much grinding and missing of holes that i thought they would be well done

Could you make a 4 gear using two of this in cascade? Or use two arms to go from second to third gear and so on? Thanks

well done buddy hope to see you on a near future owning a car factory thats how most of the well-known car brands started their bussines thumbs up👍👍

Awesome work I really like it . It work like a old gear box and one think more, if you work on gear ratio you can definitely achieve good speed and a synchronise dog clutch mechanism that care your gear shift mechanism

I reckon that shifts similar to Semi transmissions. Those aren't synchronized like car transmissions so you either have to double clutch or float the gears. Keep shifting that thing smooth and you'd be able to ride a big rig down the road.

Truly a good build man... I wish I had more friends like yourself....

is there any explanation regarding that driver pulley,why the kart did not jump right away during 1st gear?

Rupp had a 2 speed setup that used a one way clutch and two centrifugal clutches. Worked real slick, all automatic

You also can make your steering awesome, use a rack and pinion from a worn out boat steering cable, I have done this and they work great, no vibration feedback in the steering wheel, the cable go's bad but the rack and pinion units are still good, plenty are thrown out at boat shops.

Genius !! man that thing flies !

What a beautiful part of the country. Where abouts are you? Oh yeah, excellent job on the cart!!

It is amazing how well your two speed works.

Awesome job. Great idea. Check out how a 2 speed transmission works on a gas powered R/C car. Very simple, adjustable, and automatic.

I was thinking it might be good to make the holes in the transmission thing bigger. So it could go into gear easier, however it might feel weird when u go on or off throttle. Awesome go kart btw.

To help with the transmission popping into neutral you could use an old deck height locker from a riding mower. Squeeze on the spring actuated handle to release and let the spring pull the pin into the slot to lock.

Didn't think itd work but did very well. Nice job bro

Over 50 mph dam that's fast for a home made go cart super video thums up buddy

First super great job! Your ability to build the cart is great. Because you are able to reach 50 miles per hour your engineering skills must catch up with your building skills. 50 mph has more than enough kinetic energy to get you killed. The previous comments mentioned steering Caster, camber Ackerman Angles, Loctite, safety washers, the steering linkage geometry, roadworthy tires, and wheels. Your achievements are great, I just don't want them to get you killed. Lastly driving on the highway is dangrous. Old farts like me may not see a little cart. Being squashed may not be so much fun.

Just subscribed and I think you should use one of those manual 3/4 inch shaft clutches I think 3d motor sports has them

Thanks for the ride

Add a sheet metal plate with cut outs for the shifter to rest in and then have a spring pulling the shifter towards the cut out, so it locks in gear, Great job on the build

Is it possible to downshift rev match im curious i bet this system has an edge over using a motorcyle gearbox two speed seems like the ideal number fo go kart on a circuit and no heavy casing for lubrication which could be a downside depending on how you ride it and exposure to the element which could have gritty things but an upside since its lighter no resistance from the viscosity of the oil.Theres room for improvement and improving the gear synchronising method and dayum it got my brain spinning hard when im not suppose to.

11:05 The weld on the big sprocket is cracked. Very nice project though :-)

I'm very intrigued by your two speed transmission. It could use some tweaks, but you proved that it works. The hard part is done. You could always spring load it to the high gear position. You hold it in low until ready to shift into high. Then, let off the throttle and shifter, to go into high. Or, you would work out an over-center linkage that will hold it in each gear.

What if you extended the rear and moved the axle behind the transmission setup, then you can add a large sprocket on the axle for first gear. Also, you could a 3 position shifter by making a plate with three slots in it and make the shifter on a hinge that hinges away from you. Put a spring on the shifter handle so it pulls it against the plate and when you move it, it drops into one of the slots

Shift lock....simple....move lever to side, spring loaded, move forward (or back) and let the spring pull it back into a detent (notch)....2 notches, 1ea gear...you'd have to build it, simple tho, and I'd recommend install just above the base so you keep the same pivot point for forward and backward movement....

With a first gear like that, who needs second? he he. I was surprised to hear that the steering was too sensitive because it seemed to handle very well on the corners. Maybe it took a lot of upper body strength to keep it in line though. I also found the gear shifting surprisingly smooth. Overall very impressed with that build.

Kudos on the successful 2 spd transmission! Gotta do something about that sloppy first gear chain though. As far as the shifter, maybe design it with a pin and rail. If you push down on the shifter (spring loaded to pop back up into place), it'll drop out of the front hole in the rail. Once you pull back to second, the pin should align with the second hole and lock back up into place.

Why not heavy duty electro magnet on both sides as a clutch instead of those studs? Those studs break alot whenever it grabs 2nd stage?

Buen trabajo amigo. Felicidades. ..

I like the 2 speed transmission makes me want to make one as well but I would like to see u make or build a 3 speed transmission

Flute the pin holes to help engage. Plus build box around and use grease

That worked really well I can't believe that It shifts both up and down so smoothly on the move Aim for around 5.5:1 for first gear and 3.5:1 for second on your next gearbox 👍

if all of those gears are welded to the axles how exactly does it change the ratio I see no bearings when it changes gears one set of gears would have to spin faster then the other and that would wear out metal to metal?

good stuff man.ingenious.. watch them sketchy tires..50 mph is no joke

I do envy where you live & that you can drive your kart on the roads without police attention. If you look at Frazer Nash cars they had a "chain gang" gearbox with up to 4 chains / gears on these lines. The engine & clutch drove a prop shaft to what looks like a diff but is only a crown wheel & pinion turning a solid shaft thru both sides. Two chain sets each side are controlled by a wonderful sliding contraction designed to engage one gear at a time - most of the time! Tyres & road then were low grip so the diff wasn't needed, they corner in long rear end drifts. Thank you & good luck.

Just some ideas. I was thinking you could bevel the holes to help it line up smoother. It would act like a guide, maybe hard to get it balanced tho.

on your shifter... spring-loaded trigger connected by a rod to a pin down below... a simple fore-aft gate shifter, a slot with a hole on each end... pull the trigger, move the lever forward, drop the pin into first... pull the trigger, move the lever back, drop the pin into second...

Great work man! Also it's a nice place where you live, much space and surronded by trees, I'm a little jalous ;-P

if you found one of those manual clutch set ups ( im looking for one right now) i think it would help you alot

Great job. What about lubrication? Maybe Zerk grease fittings?

Nice job. You didn't listen to the doubters (myself included) and it worked!

Jeez. That thing friggin rips

believe that if you make a radial opening of a few millimeters in each hole it will give more synchronism in the gear changes

Wow it actually works, with a small bit of grinding. Amazing. Hey they place where you live looks really amazing.

I just subscribed to your channel. And I had an idea to gear shifting mechanism. Try to use something like the bicycle that can stop spinning when you stop acelerating. Sorry for my english. I dont talk very well. Lolzz