I put a 5 Speed Transmission on my Go Kart and This Happened…

[@DaCycleDawg]

As a former IKF (International Kart Federation) racer, engine mechanic in the military and currently 45 years aerospace general machinist & tool and die maker, it warms my heart to see a young guy with mechanical skills and a brain put them to use. Kudos to you young man.

[@DesertGeezers]

This young guy may just be the next Adrien Newey.

[@Rose-yx6jq]

It sounds like the best worst idea.

[@jasonsulzer7055]

Maybe with a thicker case on the Lil 6 speed,funny, that I've got the same one on my encore mower.

[@lindenmcilvena9822]

Great ! Does a zx1400 ninja in a small buggy need independent suspension on rear or will it work ok on a swing arm (rear motor)

[@Horespower_23]

You have done everything congratulations 😂

[@garyeickmann511]

I stumbled across this video and watched it and I enjoyed it. I am a retired professional fabricator that ran my own fabrication shop for 30 years. I commented to my wife that this kid is quite impressive. It’s nice to see young folks building and designing things like we old guys used to do. Keep it up 👍 you are practicing a dying art.

[@richarddonegan4666]

Cool story Sir. I just retired sheet metal fab welder. I'm chilling with my Segway Ninebot Pro go cart! I like electric. The technology is ahead of the laws. And my Segway, I can ride anywhere. Bothers nobody!

[@randomdan85]

Facts

[@shadow7796]

I really enjoy seeing young, innovative people doing their thing. Don't stop, please. You give us old genX guys some hope and some satisfaction, knowing the things we love and understand will live on. Thanks, Bubba.

[@benjamincresswell3713]

Hi, I had a Go Kart when I was a kid, in 1965. I started with a Soap Box Derby Cart that my cousin dropped off when he was done with it. It was wooden and had foot steering. Living on a dirt road, it wasn't much fun to push it around, so I took Dad's lawn mower apart and put the frame and everything including the "reel mower blade" under the back end of it. Eventually the "reel" blade was taken off, and as you would expect it only went about 3 mph but I was encouraged by self propulsion. So, I improved it when I found an old Radio Flyer Wheel that the rubber had came off of and used it for a pulley. I drilled holes through the Soap Box Derby Wheel and bolted the Radio Flyer Wagon Wheel to it. I went directly from the engine to the "wheel/ pulley" with a belt using a centrifugal belt clutch on the 3 hp engine. That was a major improvement, it went about 25mph. On my first trip down my street, when I turned the corner the board the engine was "nailed" to broke and the engine fell off and it went tumbling down the street with me by the throttle cable. Then, somebody put a Go Kart frame made out of 1 1/4" water pipe up for sale for $20. I combed the ditches for 2¢ & 5¢ beer & pop bottles, did odd jobs and mowed grass until I could buy it. That one got an 8hp Briggs & Stratton CAST IRON engine with a centrifugal chain clutch. 10 teeth on the clutch and 40 teeth on the axle #35 chain with 4.10 x 3.50 x 12" tires. It went 50mph. I lived on a dirt road, so all of my early Karts had 3 or 4 inches of ground clearance and needed to be able to handle dirt and grass. My last Kart was a low rider with rack & pinion steering. It had an 8hp Aluminum Briggs with a milled head to increase compression ratio, 2 spark plugs running from 2 car coils using a motorcycle battery for ignition. 2 spark plugs made 2 flame fronts acting like advancing ignition timing. Geared 4 to 1 at about 6,000 rpm that Kart went about 55mph. Lots of get up and go, and low center of gravity made it a blast to run. But by then I was moving on to cars. It was a great beginning though and I attribute it to my advancing into automobiles which ultimately landed me at The General Motors Proving Ground in Milford Michigan doing experimental work in advanced engineering. I'm retired now. The last thing I worked on was the Hydrogen Fuel Cell, and I just saw a KZbin video where Mary Barra GM CEO is going to veer away from battery powered EV and go to Hydrogen Fuel Cell powered EV. That's some heady shit right there boy! I hope you can gain something from what I have written here. ben/ michigan

[@volbster2]

Man this world needs more young innovative young people like you. Don't listen to the looser saying it was a waste of time or you should of... They have no respect and envy your skill. Nice work.

[@Will-W]

2 things stick out about the failure. 1 use bigger gears, less torque lost on small diameter sprockets, don't go huge but a 15-17 tooth would reduce parasitic power loss at that point. (I'm not a certified engineer, just some random dude that stayed at a holiday in express a couple times). 2nd, Outer shaft support. Run a nose off the outside with a bearing to reduce stress on the cast aluminum housing that failed. (I'm a welder/machinist/tool maker) having a "nose support" like on a coyote motor crank support for running a blower as well as timing chains to keep the crank from snapping off. Your weak point doesn't look to be the gears themselves, but the housing. Reinforce the shaft and housing on next go round. Good luck man! Stuff like this makes me hopeful for the next generation of gear heads.

[@PaulBrunhammer]

All of the criticism I have read in the comments is just plain unnecessary. This young man is out there doing it. He is not afraid to try something and ultimately he will learn constructive things from this. I am a self taught small engine mechanic and self taught computer tech, this is how I learned, I asked what if questions and dove in head first. Good job man, keep it up!!!

[@DannyNeal-g8y]

Elegant fabrication and attention to details. And an impressive grasp of design flaws. No shame in breaking parts; it's called research and development! Stay after it, young man; you will go far!

[@loganpe427]

I'm not surfing through all the comments to find out if anybody mentioned this but _you used 'way way' too much grease_ in that transmission. Stuffing it like that causes pressure to build up inside, enough too blow out and break the housing as you found out. I seriously doubt the input shaft broke because of the tensioner you made, much more likely the pressure build up was the cause. I'm a retired engineer, I've worked with tons of gearboxes like that over 40 years. Just saying not bragging brother, I really love your adventure with the Go Cart 👍😁

[@garryb6218]

I'm 67, I like this kid, reminds me of me in 1966, keep going kid, do it, you just might end up an Automotive Engineer, like me. How Cool is that!

[@reyalPRON]

Tip from an old fart. Level out your audio levels so the voice is not low compared to the music. Very good for an old mechanic to see the younger generations keep up what we tinkerers started with back in the days :) So young and already welding and fabricating working prototypes. Impressive sir. I wish you the best in not burning out early, keep your interests alive by having many factors to fiddle with is my absolute best tip to never get anything finished ;) Also helmets are cool, brain damage is not. One impaired driver heading towards you and you are done for sir. Helmet!

[@WyFoster]

Shifting technique with a sequential is important to the life of the gearbox. You don't need a clutch, you just need to go from a state of load on the transmission to a state of decel. You want to shift inbetween those two where the gearbox has no load on it. For instance, hard on the throttle, light tug of the shift lever, quick lift of the throttle and it'll drop into the next gear. For a down shift, gentle press forward and tap the throttle. It'll fall into the lower gear.

[@realblakrawb]

In other words, lash and unlash the dogs. Cars will use a strain gauge on the shifter to kill ignition to unload the box. A momentary kill switch on the shifter could be put to use if pedaling it doesn't.

[@peterlopez9403]

Nice work

[@anthonyf8113]

Could get rid of the clutch and do two pulleys with a loose belt and a third one on a spring loaded arm.

[@steven3381]

Better yet delete front tire

[@livergen]

I'm 68 years old and this is exactly what we were doing back in the day. Actually I still have scars on my left foot from riding my mini bike in the field and getting it underneath a chain-link fence because I was going to fast and didn't quite make the turn. I dragged it for a pretty good distance before I could shut my mini bike down, Of course my mom freaked out from my ripped up foot, oh well, She took me to the hospital which was nice of her LOL.... guys, you're living the dream and you're going to be okay, I couldn't even begin to guess how many people out here are so absolutely proud of you guys.

[@nathanlambert3894]

I'm with the last guy. Too many young people with their eyes glued to a screen these days. This thing you do with tools and knowledge....That's cool. Keep up the good work. People notice.👌

[@alaincharron8752]

That young man has my respect because he is making something constructive of his life. Thumbs up man!

[@timhenry4265]

Young man, This old man is now smiling thanks to you. Did the same when I was your age. Keep developing your fabrication skills, which are fantastic. Stay humble and honest. You just learned that a transmission designed for a lawn mower is not appropriate for your inted use. Press on. Use your imagination and you will succeed in life. Be careful on the road, there are others using it who don't have your driving skills. Have a blessed day my friend.

[@bar261]

You my young fabricator, are headed for greatness. Keeping custom builds alive with dudes like you is a good thing. Most kids your age are afraid of grease under the nails. You have a great mind. Bet it runs in the family.

[@professionalmike4189]

I used the same gear box in my lawnmower racing days. You need to open it up and remove the grease and close it up with RTV around the edges and put gear lube in it. You can get it in there after removing the neutral safety switch on the top of the case. The grease flings off of the gears when you run it at such high RPMs and you will burn up the trans pretty damn quick with the grease and not the gear lube. PS a lil will leak out of the 4 brass bushings, but there's not much you can do about it.

[@JRLittleArt]

Impressive young man. Great to see another generation has the itch to improve what they have.

[@robepley2709]

All I can say is, I am damned right impressed. This is what we as young teens did when I was growing up 45-50 years ago. Now 63, It is so refreshing to see a young man living life clean and not being tied to an electronic screen of some sorts. Kudo's young man... you have the whole world in the palms of your hands.

[@doctormcboy5009]

word

[@JacknifeCreations]

Holy shit I knew this was doomed from the start. first off, That's a Peerless 700 series transmission from a Lawn Mower, which is a solid transmission when used correctly, they were VERY common in professional Lawn Mower Racing, and can hold a lot of horsepower, however there is a long list of things this guy has done wrong. 1: When overspeeding the transmission as much as he did, he should have used a thinner grease or oil as that thick grease will simply sling off the gears and no longer coat them at that speed. #2, mounting the trans sideways like that is just asking for trouble, since the casing is not made for the linear force at that vertical angle. #3, these transmissions are not made to shift on the go, especially with a centrifugal clutch like that. there's no syncro gears, so you're essentially just jamming the gears together, destroying them, hence the "rough shifting" he mentioned in the video. If he set up a manual clutch that stops the input shaft completely in between shifts, he might be able to get away with shifting on the go. #4 as you can clearly see in the driving shot where you can see the back of the kart, he placed the chain tensioner on the wrong side of the chain, so all of the torque of the motor is pulling on the tensioner, and bending the frame, probably pulling the input shaft at a weird angle, contributing to snapping it off completely, as shown in the video. What could he have done to prevent all of this, and still have a cool 5 speed Kart? #1, use a thick oil in the trans, #2, mount the trans the correct direction, and use a right-angle gearbox to adapt to the kart motor, #3, use a manual clutch that slow down or completely stop the trans input shaft between shifts, and #4, avoid overspeeding the trans too much by using a larger output sprocket in order to get the ratio you need, instead of a smaller input sprocket size.

[@JacknifeCreations]

Oh yeah, I also forgot, removing the reverse chain, since those tend to fly apart when overspeeding the trans.

[@smekminfisk]

Right on brotherman

[@BeachRacing99]

@@JacknifeCreations And painting it, at speeds those boxes really heat up, and black paint only seals that heat in

[@stuartpham8580]

I like it , I want to see him do it again and let me have it when he's done with it because now I want one

[@stuartpham8580]

kzbin.info/www/bejne/lX-oqYB-nceGp8ksi=FKc7n0HpZV5mpwtV

[@ericcope8216]

Glad to see this, especially now. Nice work engineering parts to make it work, for the most part! Also, shout out to your community on not being dickheads and letting you cruise the streets. No harm, no foul.

[@robertcanup4473]

I'm a retired design engineer who worked at NASA's manned space flight center. I did some hot rodding when I was young. I can well remember what it was like to be young. You have done very impressive work here. You have multiple skills, and those skills are really important, and valuable. The key to good engineering is to think about how things will fail. If you design the failures out, what you have left is success. I'll give an example: when you are doing plumbing, if what you think you are doing is getting water from point A to point B, you are in trouble. What you are actually doing is keeping water out of the rest of the room. That means you have to be certain that your joints don't leak. In other words don't ask yourself "How can I make this work?" ask yourself "How is this going to fail?" Now lets talk about why the gear box was popping out of gear. Why would you expect it to stay in gear? Your shift lever didn't have any sort of detent system to hold the transmission in a particular gear. The torques from the motor apply twisting forces to the structure holding the transmission in place, and vibration is going to cause your shift lever to move from where you left it. When you design your detent system to hold your shift mechanism in place, think about how torques, vibration, thermal expansion, and contraction are going to affect it, and design around those problems. Expect each part to only do one job. A Swiss Army Knife looks like a good idea, until you try to eat a steak with one, and you find out having a fork at one end, and a knife at the other doesn't work very well. Now I want to talk about something no young man ever considers; safety. Humans can run about 17 mph, and the rule of two times the maximum expected stress shows up in our bodies. In other words, any sort of accident at or above twice that maximum body speed (call it 35 mph) is a potentially fatal accident; the human body simply comes apart in such collisions. The connections to the organs break down, arteries are torn loose from the heart, for example, and the body bleeds to death internally. Keep going, have fun, but stay safe. Think about what a tire blowout at high speed would do. Get tires rated for twice your maximum speed.

[@robertmccreary4749]

Motorcycle transmission shifters do not have detents.

[@scarbourgeoisie]

One of the best vids I've seen on KZbin in ages. Love to see these young kids work with their hands instead of goofing on video games. Nice work.

[@lunastrat]

A suggestion, when you ramp the music up, maybe a little less. Every time the music ramped up I had to turn it down, and then back up to hear you speaking.

[@trinidyjohnson9295]

It's awesome to see there's still people in this world who still use there hands and amagination .....just make sure you pass it down to your kids....teach them.....

[@jeffreylindley845]

Use 75w-140 gear oil in the gear case. Add a drain and fill port. Shifting will be much smoother and you will get more power to the wheels.

[@JASPACB750RR]

I’m not that old, late 30s, but what I can say is the world needs more youths like you. I’m guessing your late teens. Sorry if your not. Nowadays kids are too worried about gaming or internet trends. Not too many interested in mechanics, engineering and fabrication. Keep it up man!

[@rsz90182]

My kids are glued to computers playing Roblox or MindCrap.

[@stevepeterson1377]

Don’t let the negative comments stifle you. You are learning by doing and failures give you as much information as successes. 60 years ago I built three, none as innovative as yours. Great to see you building and having fun and success doing it.

[@murrayfarrow866]

What a great video. I'm so pleased to see a young man making productive use of his time versus sitting around playing games. He is steps ahead of others his age, understanding mechanics, using a welder and power tools. I work with adults who don't understand anything about their cars other than it goes or it doesn't (must to out of gas). I look forward to what you'll build next and thumbs up.

[@joemitchell2909]

Young man... It's good to see that you dive into creativity. I'm 63 years old and I grew up riding Mini bikes and gocarts. You are too cool young man!!!!!

[@JeffreyPar-pr2zw]

Yes, you need a clutch. The centrifugal clutch will stay engauged until RPMs at the engine drop low enough. Eventhough you release the throttle the forward momentum will keep the RPMs at the engine well above the release RPM range. You need a positive release means so you can shift without the engine torque or the momentum of the cart torque putting a load on the gears to shift. This is a very simplified explanation. Good luck.

[@charleywaffles6366]

This is the mindset of the folks in the late 40’s and early 50’s that gave us what’s known as hot rodding. Respect to you sir!

[@josephhobbs3009]

Hey dude great build! Sorry the transmission gave up but I really worried about that in put shaft when you have it apart! It didn't look like it would put up with much. The one thing I would have suggested before it broke was less grease in the gearbox I understand why you filled it but they're not designed for that and I think it had more pressure inside then you realize and that aided the breakage of the case and the shaft support! Greece is a great thing but so many people over Greece the hell out of stuff and it causes all kinds of problems just my opinion my friend but great build I enjoyed the video thank you

[@dewey404]

Bro if we grew up in the same neighborhood we’d be best friends 100%

[@willpitts4491]

Pretty much

[@jaybird3651]

Would u guys be kissing buddies

[@Foxracing401]

Grease my shaft ill grease yours kinda friends?

[@Matthew-wj8cm]

Grease my gearbox I'll grease yours

[@cameronvandygriff7048]

I'm 25 and I'd be friends with him me and my buddy actually built one with a 3 speed ours was alot more janky cause we were in highschool and alot less funds but aye

[@AStrangernightApache0864]

Dude whatever you do never give up . I'm old enough to be your grandfather and my younger brother and I had some go-carts when we were younger and man we would have a blast . Had he still been alive we still would be doing our thang . There's nothing like having fun and being young so don't forget to never give up .

[@bonermaroner2453]

My first carts were wood with dads lawnmower engine on a reel

[@danven1256]

Well I'm certainly impressed with your talent. Of my almost 50 years in the automotive industry I've only worked with a handful of people over the years that we're as creative as you and all of them had many more years of experience. Well done !

[@RedlineRick2007]

... Believe me he's a long way from 'WhistlinDiesel' level but it seems like just yesterday I saw Cody's ATV reaper wheel video and thought, welp the kids got welding skills... now if he doesn't kill himself! 🤣🤣🤣🤣

[@mycustomgokart]

@@RedlineRick2007 yeah I’ve got a few comments saying I’m trying to be like him but in reality it’s just fun to “nicely” drive things till something happens

[@RootBoyJim]

It's not the Clutch. It can't handle the Stress of the Street's Rapid Acceleration. This Transmission is one big Granny Gear for a Lawn Turtle.

[@ZelosZelo]

it dropped into neutral because of all of these factors probably: 1 too much power for the gearbox. You will have to calculate your torque to match the rated torque for the input for the gear box. Use a correct gear ratio based on the engines max power to match or under the max of the gearbox 2 yea..you need a better clutch and 3 the case was probably flexing. mount points are put in places that allow the enclosure to "flex" in a balanced way. . not enough space to explain that here.. in short you'll want to mount the gearbox the same way- (direction power is applied, distance from the power and orientation to the torque) to get the best out of it. or gussie it up by welding xtra supports and material on the case.

[@Drmelfrank]

Despite all of the criticism, you did a fantastic job. You are smart, creative, and developing a great set of fabricating and mechanical skills. WELL Done!!

[@jeffmack4995]

Hey man, loved the build! You've found the key... one learns nothing by laying down some cash and buying a rig, but learns immeasurable lessons by building it and solving the problems on your own......

[@zzanatos2001]

I had a Skat Kat minibike when I was your age. It had a torque converter instead of a transmission. Working on it with my dad taught me everything I needed to know about engines when I got my first car. Have fun and stay safe.

[@mwbjgamingprojects]

Hey kid, how ya doin'? I'm a new subscriber with years of mechanical experience since I was 7 years old & I'm 25 years old now, that Geerbox was designed for axial loads and will fail when placed under lateral load-forces. You can find Geerboxes designed for lateral load-forces on there outboard shafts. Looking forward to watching more of your videos so keep up the good work, you'll learn as you go.

[@glmoore001]

I think you stuffed WAY too much grease in the gear box. I would have thought oil would have been used. Didnt I see a drain plug on the case? If so, it is not there to drain grease :) Good job on the build though.

[@Chris-bu2hg]

I owned a garage for many years. I wish there was more kids like you in this world. Keep up the good work you’ll go far in life.

[@yelyab1]

You answered my first question. Don’t give up on the gear box. Get a 10 speed automatic. Junk yards should be filling up with that base Ford engine trans combo. What a rip. I hate to admit to this but the guy that said go electric would make life a lot easier. Naw. Stick with, suck, smash, bag, go!

[@555byron]

Peerless 5 speed transmissions can be converted to gear oil instead of grease. Faster, better shifting, and it's easier on everything because grease is too thick for going fast. These are used for racing lawnmowers all the time and that is where I heard about the gear oil conversion

[@tedgaddy7398]

So great to see a young man with natural mechanical skills like my self, I’m 64, great video

[@dinojimenez6888]

Well said, I’m thinking the same thing. What a good kid he’ll be a great man one day.

[@patrickvanden8322]

7:35 Are you sure you used enough grease?

[@naff81275]

Nice work and video, I really think the grease was your limiting factor. Use 80w-90 and make sure you touch up your seals and seal the case. Probably have better luck. Some single seal bearings would also help. I would like to see you try again. 👍🏽

[@TheBeeMan1994]

Alot of the people are talking about sideload, but the biggest issue with a peerless 700 is they MUST be used with a clutch. They are designed for sideload but not rammerjammin into the next gear, the neutral you were getting was the shift forks not slipping into the next gear, and instead the gears spinning around them. They absolutely need to be used with a clutch

[@borgdrone8369]

Out of all the comments here no one told you to put 90 wt gear oil in that trans not grease !!! That's why that trans broke ...

[@minnesotarc7964]

and Rightly so. That grease likely doesn't have the fluid dynamics that gear oil has going in between the teeth. The amount of friction being built up on a part that wasn't getting enough of the multipurpose grease to fully incase the sprockets in a continuous fluid. Some parts got hot enough because of lack of lube that something had to break.

[@american23t]

I was going to say that. Only it's probably SAE60 non detergent Harley-Davidson.

[@duanebaalson2287]

Upgrade your lube to synthetic. It’s more forgiving when it comes to heat….

[@nicolec7290]

That went through my brain to. Bet your right

[@bob1947essex]

Way too much grease, it'll absorb power, and then get very hot. Thick oil may have been better as long as the shafts have seals fitted.

[@chefscorner7063]

Heat also weakens the metal. Good call.

[@fatttony9156]

90 weight would of been my choice . Not grease.not for a gearbox. I have never drained grease out of a gearbox before.. you live you learn ya know . Kid has a good aptitude for mechanics .

[@stevenklein8245]

Morons. Thats literally the manufacturer recommendation for almost all sequential gear boxes. A pound of grease.

[@bob1947essex]

@@stevenklein8245 Rubbish. I used to work for Ricardo's. Worked on the design of the McLaren F1 gearbox, and the Bugatti Veyron. You need an oil with GL4 or GL5 specification.

[@alancooper7062]

That gearbox will have so much drag with all that grease ? Surely oil filled would be so much better ???

[@leave_me_alone_im_trying_t9685]

Well you dont know if you dont try. Dont listen to negative comments, those people probably never have and never will be able to fabricate or build anying in there lives. Cool project 👍

[@jasoncummings4994]

Exactly! I couldn’t have said it better myself. 98% of the neg comments haven’t taken their fingers off the computer long enough to try! Better to try and fail than to never tried at all.

[@jimbo44cc13]

Nice, impressive fabrication. Great job. YOu have a bright future ahead of you.

[@keithsteinle747]

A centrifugal clutch don't disengage until the RPM of the engine is close to idle (depending on how heavy the springs are) you need an actual clutch system to make the gear box work. Now if you can find an external motorcycle transmission you might be able to power shift it by dropping RPM to shift.

[@woodsmn8047]

the gearbox is designed for a lawn tractor that goes 5 to ten MPH tops when you geared it up to 50 MPH it subjected the gearbox to strains way beyond it's ability and it self destructed ... get an engine trans from a small dirtbike that will stand the strain ...!

[@BobbyRiggs-d2k]

50hp racing lawn mowers say different

[@mitchellwoodham28]

1. Thanks for sharing your talents. 2. You remind me of my twin bro at that age... Always "hopping up" bikes/carts with whatever parts he could find (chainsaws/mowers/farm equipment) from belts to chain drives. Give him a stick welder/hammer and he'd make it work. He's a successful mechanical engineer now... So keep it up. 3. Take care of your body now because when you get in your 50's all those bumps/bruises will take its toll.

[@AEON.]

TIPS: REMOVE the REVERSE from that gearbox!!! - look up how racing lawn mowers use that peerless gearbox - and how they make it race ready and reliable and so they don't destroy themselves - also use roller bearings on the casing - not the stock copper bushing (no bearings just a copper sleeve) do not use ball bearings there - they are not as effective especially with the torque from stop and go and heavy acceleration. You can find these gearboxes for dirt cheap to free from most REAR ENGINE LAWN MOWERS! John Deere and Snapper mowers that have the rear engines will most likely have these gear boxes.

[@KapiteinKrentebol]

7:30 Don't overdo it with the amount of grease, too much grease and the gearbox will overheat. Usually the manufacturer states a certain weight of grease to put in.

[@patrickvanden8322]

ik denk het meer een probleem is het een versnellingsbak voor stilstaand schakelen ofwel geen syncromesh

[@circomnia9984]

Honestly, when I saw you shoving that much grease in there, I was like, that gearbox is gonna explode!! Imagine my surprise when I got to the end. Anyway, you live and learn. Main thing is you're doing something you love, and it shows. Great to see young kids having healthy fun. Keep going, you'll be great some day.

[@highnoonsmallenginerepair]

Dude! Your channel is so underrated! You deserve more subs. I can tell you put a good amount of effort into these videos with the carts and the video editing. Props to you!

[@highnoonsmallenginerepair]

Also I'd love to see that gearbox with a proper manual clutch or possible torque converter

[@mycustomgokart]

Thanks dude! 🤙

[@highnoonsmallenginerepair]

@@mycustomgokart For sure! 👍

[@carlschroeder6811]

Nice job for such a young guy, you are very talented! Those transmissions need "00" grease (Snapper part #7061017), much thinner "flowable" grease than what you used, fill case about half way.(the grease will be slung and flow into all areas needed). This transmission is also not designed to be shifted on the fly or run at that high RPM with the side load/torque of your primary chain setup, those bronze bushings will wear very fast compared to ball/needle bearings.

[@shanew.williams]

What a great idea ! Don't know if those old mower gearboxes were ever meant to shift while moving or "on the fly" but your imagination, enthusiasm & skills make me remember what it was like to be young.

[@quantumleap359]

The chain snap can be eliminated by putting the tensioner on the slack side of the chain, not the pulling side. Also, an outboard bearing on the transmission input shaft will take the side load off the input shaft bearing. Also, centrifugal clutches are tough on transmission gears, the engagement chatter tends to break things.

[@theguitarlocust]

Awesome project. Love all the negative comments from the game boys who never get their hands dirty.

[@Krytren]

As a kid my Dad and I built a go cart with a 440 liquajet snowmobile engine. It was really fun, spent way more time broken then running. First take off it burned the rubber between rim and tire lol. Had to hard mount tires for it. (Lawn mower tires) Second take off, it lifted the wheels and the pully split, lol luckily we planned for that potential and had guards. Shortly after it was finally good to go, we moved and sold it to a friend.

[@JMMACxXxSHELZ]

Dude u have a sick ass natural sleekness to your build style. its just clean.

[@teddypamperin6232]

Freaking Fantabulous job! My only suggestion would be to not overload the gearbox with grease. Too much and it will lead to overheating because of all the extra friction from churning the grease....

[@sarcastrophe6992]

i agree

[@ronnyeverett9687]

The reason this did not work is because this is what's called a centrifugal clutch. The clutch engages when you Rev it and stays engages when you stay in the revs. When he was running the engine up and trying to shift the clutch was still engaged which causes a shockload on the system and therfore breaking the output shaft of the gear box. Hope this helps:)

[@secondhandlyon2603]

I think a motorcycle transmission would be a better idea. Ideally the ratio should be 1:1 in second gear. Pretty cool project.

[@bthompson101202]

Even though it broke..i call that a win. Id rather have more torque vs not enough. Great video man

[@jimmcallister3795]

dudes a hero, great video. don't pay attention to the naysayer comments about what you should use. keep doing what your doing as long as your still having fun doing it.

[@rogermitchell6272]

You renew my hope for young guys of today. To see a young nan working with his hands and not a game controller.. im a old gear head from 1960s i was under cars more then in them , it all started with building Go-Karts keep up the great work😊

[@John-wx6wj]

Some young folks with game controllers in their hands are controlling submarines, UAV drones, fighter jets, robots, tanks, etc. Just because you don't understand, doesn't mean it's bad. I'm 100% sure the kid in this video owns plenty of game controllers as well. Get with the time boomer man, or get obsolete.

[@dorun2002]

I'd be curious to see how this worked. Those transmission required Bentonite not grease. Also landscapers killed these in one season my trying to change gears on the fly. They were only effective when stopping the machine changing gears and then proceeding. I do applaud his skills in design and building this cool little cart.

[@gandyrick6425]

This reminds me of when I was that age, 50 years ago, and constantly played/tinkered with snowmobiles. The one thing that is a lot different however, is that I couldn't move the track of my sleds without having my helmet on...or my Dad would have instantly grounded me. While I thought that was harsh back then, too many people I know of through the years have been killed or maimed riding bikes without a helmet and I now know how right he was. All of y'all need to start wearing helmets...and setting a better example.

[@demonicsquid7217]

To be honest, he's welding without gloves, and doing all sorts of other stuff with no safety gear. He'll wake up once he loses a finger or two, or is having paramedics try and save his life after electrocuting himself. A for effort, F for everything else.

[@rodgers1161]

You are obviously a diamond in the rough with your ingenious intelligence - I'm sure it goes well beyond gocart building, much much more? Keep up your passion as you go in life as I'm excited to possibly see more of what you have to offer in this life? I am richer for it after just one video

[@gerrywood5325]

With the type of transmission you had on the kart, you shouldn't have let off of the gas every time you shifted. That transmission was a straight shift without the use of a clutch similar to a CVT transmission like you find on a Can Am Spyder, that's why it kept going into neutral and that's why the shaft broke out of the transmission.

[@sofy5432]

Theory abt transmission fatigue: 1) Gearbox & sleeve bearings not designed for these speeds 2) Your grease as gentleman mentioned below thou acceptable in low speed applications may not be compressing fast enough as it passes btwn gear teeth pushing them apart. 90-80wt typical 3) Axial shock load fatigue, maybe added support on trans'n output shaft . .

[@aaronmoss5366]

Are you certain that gearbox is supposed to be packed with grease like that? 80-90w instead of a ridiculous amount of red and tacky would be better I think.

[@wildchildss15]

You did a great job, but please wear a helmet. You have a great mind. Don't waste it sir.

[@rmckayne]

You are a genius! I hope more young guys follow your jorney. America Need youth creating . Applause for all your team. God bless all of you.

[@70FordMach1]

I bought one with a older 250cc Suzuki engine years ago. It already had 5 speeds in the engine. Would easily pop a wheelie. Very dangerous. Why don't cart racers use motorcycle engines? Changing gears adds to the fun.

[@ianmurphy2580]

Rules, it's usually stock appearing engines, fairly strict rules

[@RAV21-32]

Keep building and coming up with new and better ideas!! Good video work!

[@blue68chevelle]

Me and a few of my friends used to build racing lawnmowers. The rules were pretty simple. other than larger pulleys, and some type of gas pedal arrangement, basically everything had to come off of some kind of a lawnmower. that type of transmission is OK but if I remember correctly, there isn’t a lot of bearings in it. The main shaft that holds your gears have bronze bushings and that’s it. Also, I believe reverse is a pretty flimsy chain drive. It’ll work, but the bushings will be worn out before too long. The transmissions we never did destroy were the Spicer six speed slide shifts. They are pretty easy to recognize because the mower has the gearshift between your knees and the shift pattern is R. N. 123456 in an arc. Those things don’t have any space between the gears so you can’t really miss the gear. You can skip a gear, but it just goes into the next one. On the mowers, we would only use the clutch for first gear and reverse. All the other gears it was just mash the gas, let up, slam it into the next gear, mash the gas again. But they are transaxles so a little different setup.

[@comethiburs2326]

these gearboxes arent meant to be slam shifted, even with that centrifugal clutch it was getting beat pretty hard. Nothing's worse for torsional loads than a 90° bevel drive, the case just wasnt built for this kind of abuse. It was meant for a 5/6hp briggs on granny gears most likely. if you want to try again, try to work with a chinese honda clone pit bike engine, or a seized 2 stroke 250cc or more. delete the cylinder, cut the crank out, connect the predator by making an adapter in situ of the ignition flywheel, by chopping off the magnets. that's only possible if the ignition side of the block is dry. like on 139FMB engines. you'll get a really simple 4 speed gearbox that runs on oil, not grease (the heat caused by the friction and the rpm on that 90° trans didnt help) and can hold up ~20hp before it breaks. assuming you're not dumping it down on pavement like a caveman. or just get a 250cc+ 4 stroke motorcycle engine. might want to stretch the frame or make a new one though.

[@chesterholland5017]

Great job on the cart, a career awaits you but I would have used 85W-140 gear oil in the gear box and only half full. I don't know if that would have saved the gear box but it would have shifted much smoother and dissipated heat better. That red grease you used is for slow moving applications.

[@tmikemay6223]

Dang im impressed as hell. Youve got all the skills of an Engineering expert. Get yourself a degree you’ve definitely got what it takes.

[@baddage]

Great enginuity, young man. You will have a good future and a lot of fun in life.

[@ast-og-losta]

I push paper for a living. I've always been in awe of people who can fabricate. They are the true heroes of humanity.

[@Tenasedeinc]

I marvel at fabricators

[@dand3975]

Best way to learn fabricating and welding is by trying. Get a mig welder from harbor freight, watch some KZbin videos, and just keep trying till you get it right.

[@Tenasedeinc]

@ might try this

[@tman6762]

You have a lot of great compliments and you deserve them! But..... be safe.... you are young and you need to consider longterm effects of some of this stuff. Be careful with fumes and dust and noise. Keep the passion going and live it! Your a great inspiration....

[@philchristensen2787]

You’re a smart young man! Respect.

[@douglascushenbery1747]

My experience, lawn mower transmission housing are not thick enough material to handle that level of abuse. Also if you synchronize the gears (bevel the teeth) if done correctly, you won't need a clutch. For go carting a 3 speed transmission works better than a five. you will find the gear is similar, but quicker, less moving parts to fail, less time shifting. Last thing, use a l synthetic oil, not grease, in the gear box.. Good video, show more than pavement and turning tires next time. Enjoyed watching.

[@BuceGar]

Every time I see someone use a lawn mower transaxle for a go kart, I always wonder why they don't use gear oil in stead of grease in the transaxle.

[@genefogarty5395]

Beveling a gear doesn't make it synchronized. Synchros make it synchronized. My Jerico 4 spd has straight cut gears and I can upshift at full throttle with no clutch.

[@timeforbigchange9417]

I agree with the thick grease comments, but always remember when doing your own build from scatch the weekest part is gonna break through trail & error. I think that aluminum gear box case at the output shaft can be aligned and welded reinforced and used again. Don't give up and don't get married, remember your dreams.

[@milescarter7803]

Assuming the shift pin would hold up: lose the bevel drive and extend the input shaft out the side. Connect the input directly to the engine with a sleeve for example and then it will not only get lubricated properly it completely removes the drag and weakness of that bevel drive.

[@mycustomgokart]

Thanks man

[@cantseeneedcaps]

AFTER 50 YEARS IN THE BUSINESS, IKNOW TALENT AND YOU HAVE IT YOU DO GOOD WORK KID STICK WITH IT

[@77.88.]

You bet he has what it takes, if he dose not QUIT?

[@flightschoolcountyHelicopter]

Find a Harley transmission! 4 or 5 speed and there is a 6 speed too. When i was a kid i put a hd 4 speed on a mini bike with a 5hp Briggs. It was very reliable and excellent when i had a friend on going up hill. Eventually changed out the centrifugal clutch for a cone belt Tc while still using the Harley transmission. Drove that minibike every place...made a lot of chain whine noise because of the jack shaft and the different size sprockets but it sounded like great gear whine. Just wanted to say you're a good mechanic keep up with it.. Geat projects come out of little garages. Subbed

[@TripMeister]

As others have suggested, bone yard bike motor/tranny. My suggestion is a Kawasaki 3-cyl, 2-stroke w/a 5-speed. Talk about TORQUE!! I'm very impressed with your talent and determination!! Keep it up!

[@tresfingeros]

You'll tear up a frame or twist it...( understanding it's come a long ways since the 80s when i race pro karts) back then 175cc was the max ppl experimented with 250cc and had problems with axels and twisted frames.

[@TripMeister]

@@tresfingeros funny how motorcycle frames that hold these torque monsters from the factory never tear or twist. Someone needs to do their homework.

[@Displacement-destroyer]

Only thing I can think of is you dumped way too much grease in there and she probably could have got away with gear oil like half quart of 80/90 weight oil instead but otherwise it was a really nice build.