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.
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.
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.
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.
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.
Allen McKinney looks good but are u able to get rid of some slack in the first gear chain? Between the looks and sound i thought it was gonna come off.
Me too. I thought that chain would hop the sprocket too. Also, open up the holes in that disk so they are more elongated. That should make shifting a little faster with reduced grinding.
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.
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!
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....
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
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 ..
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).
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...
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.
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.
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.
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.
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.
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.
Need smaller steering wheel. Take my advice add roll bar. In 80's I flip similar go-cart about 40mph , took hide off both arms. The problem was ,wife was at work about 20 miles away, and no way to get to hospital, wrap towels around arms and waited. Never rode another cart. No roll bars,if had them would not have been as bad.
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
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!
I know this video is old now and I'm sure you probably already came up with a good way to hold the shifter. But my first thought is either simply putting 2 springs. One spring pulling the lever back, one forward, at the correct angle the spring tension will decrease on both springs when either forward or back. Or a single tensioner working in the same manner..
If you use a bike brake or something close to it you can slow down or stop the driven pulley so you can put it in gear and shift easier and not grind the fingers as much. Great Job!!!!
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.
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
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.
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.
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.
I suggest you chamfer the holes the dogs engage into in a tear drop shape to lessen the wear otherwise an innovative, effective garage built go kart, looks like a lot of fun, enjoy! Thanks for making the inspiring video..........
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.
^^^^I like the slots idea But you'd need a milling machine and a rotory table to make those rounded slots(or a cnc machine). Also, having the slack in between the pins and the plate might accelerate wear, or shear those pins. I think I heard chatter in his setup as it was. Also, the less consistent power of the single cyl engine increases the chatter. Just in my thinking, though.
Just leave them both engaged, add another torque converter and switch between them. That's how many modern vehicles work, no more grinding and instant shifts.
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
The first video I saw of yours was a weak ass attempt at building a kart using a self propelled mower engine. I told you to quit wasting your time and build something worth your time and money. Well, you did just that... I was blown away with this build. You did a fantastic job ! I have a 2 speed automatic transmission on my Sears roper mini bike. It has enough torque in first to ride a wheelie and hits 65+ in second gear. It is comprised of 2 cent clutches , one using a one way bearing.. it's an N.O.S set up I bought off eBay. It ran around $300 in total , plus a reproduction mount I had made . I believe it was from a company called black widow.... I want to put it on a light street kart.... I think it would be a blast.... and in thinking of how the transmission works, a 3 or 4 speed could be engineered , I'm sure.... Love the new skills you have acquired. You got a new subscriber....
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! 👏👍
A spring on the L shaped piece of your shifter linkage would hold pretty good in Both gears, you just have to build an mounting point in the back side of the L
For the fast gear, shouldn’t the sprocket be smaller? I thought that big sprockets on the axle meant lower speeds but faster acceleration. Feel free to educate me lol
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 !
There's a reason why go-karts have low profile tires, the larger diameter would make any kart unstable. You want more speed(????) add another tooth to each sprocket. Very impressive young man. VERY!!!
It's already geared alittle to high as he even said. Putting tires 4" taller will add so much circumference it will want to do 80+mph but won't have the torque to ever get there..lol
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.
The two marches were super legal, but you would have to make it easier when you make the changes by improving the holes' entrances with small wear on the side that enters and not that they are front. Monica
Wow, you stopped just in time, or you may not have found that part of the torque converter. Trans seems to work really well! the bolt seemed to just back out, you were really lucky.
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.
I don't know if you've done it in recent video, but I would have an idea for a clutch system. I would put a longer belt on the motor and put a third pulley that act as a tensioner. So there you have, a working clutch and a long lasting "transmission"
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!!
So basically you have an underdrive gear and a direct drive gear. Think you can up the ante and include an overdrive gear in your next build or possibly modify this one to include an OD gear?
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??
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 👍
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
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.
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?
right .... i see what you did now, left the cent. clutch and gave it a two speed rear end. clever. here's what you do if you want it to last: take a couple of 6" circular saw blades, cut the teeth off and make them the same diameter as your outboard wheel plates - the ones with the sprockets on them - make these into wear plates to catch the lugs on the drive plate. this hardened steel will not wear out as fast and will prevent ovulation on the outboard plates. doing so will make the drive lugs the weak point, and the wear point. replace those with grade 5 shoulder bolts. you may need to do some reconfiguring on your drive plate, but, basically, you'll want to make it so the drive lugs can be threaded out and replaced. using some hex stock may work ok. if you don't accomodate for wear, this mild steel will not last long. perhaps there may be a better way to do it, but, off hand, this is the simplest fix i can think of. good luck.
I see you have your kingpins angled in at the top toward the center of the cart. Do you have any "caster" built into the kingpins. This would be a rearward angle at the top. This would improve the stability of the steering. Great job.
Looks like BIG fun to drive this....Love it! But this is totaly forbidden here in germany. You can lost the car driving license if the police find you on public streets with this. :-/
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!
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.
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!
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.
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.
I too watch project binky. lol
RichieRichOverdrive ateunoitepag
RichieRichOverdrive ate
J&A Lawnmowers you need to add akerman to your steering geometry. Your steering arms should point to center of rear axle, and be BEHIND front axle.
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Find 'em and grind 'em, still an awesome setup nonetheless, makes me want to try and build one
damn never expected it to work that well, good job man!!
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.
carabela125 a cush like a street bike
Put some spring pushed friction plates that spline with the transfer wheel. Could make shifting alot smoother by acting as synchronizers.
I was expecting to the 1st gear chain to come off.
Me too, he might need a half link rather than a full for that one.
Allen McKinney looks good but are u able to get rid of some slack in the first gear chain? Between the looks and sound i thought it was gonna come off.
Me too. I thought that chain would hop the sprocket too.
Also, open up the holes in that disk so they are more elongated. That should make shifting a little faster with reduced grinding.
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 JOB....... DON`T LISTEN TO THE HATERS. KEEP DOING WHAT YOU DO.
buck tooth bettys boyfriend he literally has none
buck tooth bettys boyfriend
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!
good work bro....i think no one can hate your work brother.....u explains in the much understandable way...
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....
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
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 ..
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).
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...
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 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.
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.
I agree amazing. But I disagree on adding more unnecessary moving parts. He just needs to adjust the tension on the chain alittle.
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.
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.
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.
A longer fan belt and a Idler Pulley on a Cam/Lever between your existing Pulleys Can engage and disengage completely acting as a clutch.
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.
You should make some kind of synchronizing ring out of rubber or something
Hunter Petrovich was thinking thesame thing
Hunter Petrovich he could make the holes for the studs to go in oval.
He could cannibalize an old th350 or something for the frictions lol
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.
Rupp had a 2 speed setup that used a one way clutch and two centrifugal clutches. Worked real slick, all automatic
Need smaller steering wheel. Take my advice add roll bar. In 80's I flip similar go-cart about 40mph , took hide off both arms. The problem was ,wife was at work about 20 miles away, and no way to get to hospital, wrap towels around arms and waited. Never rode another cart. No roll bars,if had them would not have been as bad.
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.
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
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!
I know this video is old now and I'm sure you probably already came up with a good way to hold the shifter. But my first thought is either simply putting 2 springs. One spring pulling the lever back, one forward, at the correct angle the spring tension will decrease on both springs when either forward or back. Or a single tensioner working in the same manner..
Good build but a two speed automatic transmission can be made with two automatic clutches and a sprocket with a one way clutch in it.
If you use a bike brake or something close to it you can slow down or stop the driven pulley so you can put it in gear and shift easier and not grind the fingers as much. Great Job!!!!
Awesome ! Glad the converter came off at stop.Wouldn't have found it all if at speed.REally Great build>Thanks for showing us.
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.
believe that if you make a radial opening of a few millimeters in each hole it will give more synchronism in the gear changes
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
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.
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.
Ace! NOW TURBO IT 😂
Very nice and simple design that worked. liked it very much. keep up the good work.
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.
Looks great only one thing I would do differently is tighten the chains
This would be crazy on a mini bike! Sprocket on each side of the wheel with this contraption in between the engine and wheel
I suggest you chamfer the holes the dogs engage into in a tear drop shape to lessen the wear otherwise an innovative, effective garage built go kart, looks like a lot of fun, enjoy! Thanks for making the inspiring video..........
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.
^^^^I like the slots idea
But you'd need a milling machine and a rotory table to make those rounded slots(or a cnc machine).
Also, having the slack in between the pins and the plate might accelerate wear, or shear those pins. I think I heard chatter in his setup as it was. Also, the less consistent power of the single cyl engine increases the chatter.
Just in my thinking, though.
It'd be clunky. Literally. When ever you applied/released the throttle, it would clunk as the drive would catch up axle or vice versa.
good point. maybe having slots that start at the face of the disc and gradually deepen, though he would still need a mill
Just leave them both engaged, add another torque converter and switch between them. That's how many modern vehicles work, no more grinding and instant shifts.
I really like your design. I think it could be improved using some heavy duty springs and gears from a "lunchbox locker".
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
I realize it would complicate the machining process, but shifting would be easier if you were to elongate those engagement holes into arcs.
11:05 The weld on the big sprocket is cracked. Very nice project though :-)
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
Flute the pin holes to help engage. Plus build box around and use grease
The first video I saw of yours was a weak ass attempt at building a kart using a self propelled mower engine. I told you to quit wasting your time and build something worth your time and money.
Well, you did just that... I was blown away with this build. You did a fantastic job !
I have a 2 speed automatic transmission on my Sears roper mini bike. It has enough torque in first to ride a wheelie and hits 65+ in second gear. It is comprised of 2 cent clutches , one using a one way bearing.. it's an N.O.S set up I bought off eBay. It ran around $300 in total , plus a reproduction mount I had made . I believe it was from a company called black widow....
I want to put it on a light street kart.... I think it would be a blast.... and in thinking of how the transmission works, a 3 or 4 speed could be engineered , I'm sure....
Love the new skills you have acquired. You got a new subscriber....
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! 👏👍
Put an over-center spring on the bell crank linkage to keep it in the selected gear.
Looks like some fun roads to drive on, lots of curves. 2 speed without a clutch is awesome.
A spring on the L shaped piece of your shifter linkage would hold pretty good in Both gears, you just have to build an mounting point in the back side of the L
That works much better than I thought it was going to. Good job!
I've followed your transmission build. and I'm impressed. Nicely done.
Fuggin love this channel!!!
Great work man keep it up!!! So badass!!
For the fast gear, shouldn’t the sprocket be smaller? I thought that big sprockets on the axle meant lower speeds but faster acceleration. Feel free to educate me lol
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 !
cody cheney reverse would be awesome!
cody cheney i
cody cheney i think he needs a shift lock just a little lever on the shift handle to release it if he pulls it
There's a reason why go-karts have low profile tires, the larger diameter would make any kart unstable. You want more speed(????) add another tooth to each sprocket. Very impressive young man. VERY!!!
It's already geared alittle to high as he even said. Putting tires 4" taller will add so much circumference it will want to do 80+mph but won't have the torque to ever get there..lol
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.
is there any explanation regarding that driver pulley,why the kart did not jump right away during 1st gear?
Wow that’s pretty ingenious! I build all kinds of crazy/wacky stuff myself but that trans is really cool!
Put an offset spring mechanism on it to hold it in gear. Use a detente to hold low-neutral-high.
The two marches were super legal, but you would have to make it easier when you make the changes by improving the holes' entrances with small wear on the side that enters and not that they are front. Monica
Wow, you stopped just in time, or you may not have found that part of the torque converter. Trans seems to work really well! the bolt seemed to just back out, you were really lucky.
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?
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.
I don't know if you've done it in recent video, but I would have an idea for a clutch system.
I would put a longer belt on the motor and put a third pulley that act as a tensioner. So there you have, a working clutch and a long lasting "transmission"
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!!
I wonder if you lowered the idle speed it would allow the drive sprocket to engage smoother from a stop.
Hey you figured out a " Crash box!" Lots o fun!!
You're thinking,planning,building and learning. Awesome keep it up young man!
What a beautiful part of the country. Where abouts are you? Oh yeah, excellent job on the cart!!
Awesome work. Been thinking minibike the whole time too. Looking forward to your next build with this limitless potential.
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.
So basically you have an underdrive gear and a direct drive gear. Think you can up the ante and include an overdrive gear in your next build or possibly modify this one to include an OD gear?
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??
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 👍
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 hear you screaming "I live I die, I live again!" -from Mad Max Fury Road
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.
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👍👍
pretty cool yes the torque converter is the same thing but still it gives you more
Ive been following your videos for a few years now and dude your getting better and better hell my uncle subscribed as well
That's pretty darned smooth.
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?
Great job. What about lubrication? Maybe Zerk grease fittings?
right .... i see what you did now, left the cent. clutch and gave it a two speed rear end. clever.
here's what you do if you want it to last:
take a couple of 6" circular saw blades, cut the teeth off and make them the same diameter as your outboard wheel plates - the ones with the sprockets on them - make these into wear plates to catch the lugs on the drive plate. this hardened steel will not wear out as fast and will prevent ovulation on the outboard plates.
doing so will make the drive lugs the weak point, and the wear point. replace those with grade 5 shoulder bolts. you may need to do some reconfiguring on your drive plate, but, basically, you'll want to make it so the drive lugs can be threaded out and replaced. using some hex stock may work ok.
if you don't accomodate for wear, this mild steel will not last long. perhaps there may be a better way to do it, but, off hand, this is the simplest fix i can think of. good luck.
What is the material of yours transmision? May i see the detail design?
Very nice project. I hope the transmission will not break without clutch
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
I see you have your kingpins angled in at the top toward the center of the cart. Do you have any "caster" built into the kingpins. This would be a rearward angle at the top. This would improve the stability of the steering. Great job.
Looks like BIG fun to drive this....Love it! But this is totaly forbidden here in germany. You can lost the car driving license if the police find you on public streets with this. :-/