Muncie Posted April 27, 2018 Share Posted April 27, 2018 If you were worried about shearing off the bolts on ya rear wheels sprocket I'm chucking 18-20hp through same setup and its been sweet even with a bitey clutch that grabs at 2500rpm. Kind of like a bumble bee it shouldn't work but just does. 3 Quote Link to comment Share on other sites More sharing options...
SOHC Posted April 27, 2018 Author Share Posted April 27, 2018 8 hours ago, Muncie said: If you were worried about shearing off the bolts on ya rear wheels sprocket I'm chucking 18-20hp through same setup and its been sweet even with a bitey clutch that grabs at 2500rpm. Kind of like a bumble bee it shouldn't work but just does. Thats nice to know, its super strong now, I spent hours making that rear wheel. what engine are you using? Quote Link to comment Share on other sites More sharing options...
Muncie Posted April 27, 2018 Share Posted April 27, 2018 Honda GX610 Works pretty well sounds awesome. 3 1 Quote Link to comment Share on other sites More sharing options...
SOHC Posted April 28, 2018 Author Share Posted April 28, 2018 Haha nice, I did LOL when I saw that. Quote Link to comment Share on other sites More sharing options...
Muncie Posted April 28, 2018 Share Posted April 28, 2018 Longer you can make it the better mine does it's best to spin the scooter around the back wheel with me on it. 6-10hp is plenty on small wheels. Quote Link to comment Share on other sites More sharing options...
SOHC Posted April 28, 2018 Author Share Posted April 28, 2018 21 minutes ago, Muncie said: Longer you can make it the better mine does it's best to spin the scooter around the back wheel with me on it. 6-10hp is plenty on small wheels. Dose that engine spin clockwise and what dia is the PTO shaft? I made my frame tall enough to fit most engines in there, the big Kohler fits in the rails. Quote Link to comment Share on other sites More sharing options...
Muncie Posted April 28, 2018 Share Posted April 28, 2018 Standing at the flywheel it spins clockwise. It's a 1" shaft it does limit the size of sprocket you can get on the clutch I just run a 5/8 jack shaft to get the gearing where its happy. It had gearing that in theory would of been good to 100mph reality was it threw me off at half that...... lesson learned don't tempt yourself gear it to 80kph tops that will give you plenty of tyre smoke. 2 Quote Link to comment Share on other sites More sharing options...
SOHC Posted June 4, 2018 Author Share Posted June 4, 2018 I just picked up today a Tecumseh 8 HP engine, I was bidding on it wile I was in Japan, its in mint condition, it came off an industrial vacuum, its like new, it will bolt right on to my mounting plate but I need to space the rear sprocket over a bit as the engine is a bit wider and I will need to cut and reweld my rear mudguard mount, I may not need to do anything if I use a gokart veroator drive thing. https://www.trademe.co.nz/business-farming-industry/industrial/engines-motors/other/auction-1651226130.htm?rsqid=3176e9748e7142e393eefc3180413f0b What do you think, should I get one or just use the clutch? Quote Link to comment Share on other sites More sharing options...
SOHC Posted June 5, 2018 Author Share Posted June 5, 2018 2 Quote Link to comment Share on other sites More sharing options...
Muncie Posted June 5, 2018 Share Posted June 5, 2018 Definitely go the CVT regret using a clutch on mine it slips down low if i gear for speed have to rev it do death geared for fun and acceleration but have no top end. Quote Link to comment Share on other sites More sharing options...
Kimjon Posted June 6, 2018 Share Posted June 6, 2018 Cvt is best. And belts are cheap to replace. Clutch is okay...but a disposable item. And if geared incorrectly won' last long at all. Either way will be fine though. Your project is looking pretty sweet! Quote Link to comment Share on other sites More sharing options...
Muncie Posted June 6, 2018 Share Posted June 6, 2018 I like how you could fit a beer crate in front of the engine for a small dog or something else cool. 1 Quote Link to comment Share on other sites More sharing options...
JustHarry Posted June 9, 2018 Share Posted June 9, 2018 Why not use two engines to fill space? 3 Quote Link to comment Share on other sites More sharing options...
Muncie Posted June 10, 2018 Share Posted June 10, 2018 Half a 12A as a supercharger ? 21 hours ago, JustHarry said: Why not use two engines to fill space? 2 Quote Link to comment Share on other sites More sharing options...
SOHC Posted June 10, 2018 Author Share Posted June 10, 2018 I ended up buying a 1" heavy duty clutch but I could only get it in a 14 tooth sprocket, I am going to make a jackshaft set up. I will have 14 teeth on the front and 37 on the rear I am running a 420 chain and sprockets, wheels are about 10" tall, how do I work out what size the sprokets need to be on the jackshaft? Quote Link to comment Share on other sites More sharing options...
SOHC Posted June 10, 2018 Author Share Posted June 10, 2018 I just found a sprocket calculator, I reckon if I gear it for 30 MPH should be enough. Engine RPM 3600 Engine clutch sprocket, 14t Jackshaft input sprocket 14t Jackshaft output sprocket 10t Rear sprocket on wheel 37t Tire height 10" 3.7:1 Dose that sound about right? or should I try to just find a bigger rear sproket? Quote Link to comment Share on other sites More sharing options...
Muncie Posted June 10, 2018 Share Posted June 10, 2018 I used this https://www.gokartsupply.com/mobile/ratios.htm Then mixed and matched what i had and what could be bought to get a decent top end. Dont be tempted to gear it for max top end or itll be hard on the clutch down low i geared mine for 50ks at 3800rpm. Then you can gut the governor if you run out of legs. 1 Quote Link to comment Share on other sites More sharing options...
Muncie Posted June 10, 2018 Share Posted June 10, 2018 Motive parts supply co on Facebook are cheap. Starchy on trademe. Quote Link to comment Share on other sites More sharing options...
SOHC Posted June 10, 2018 Author Share Posted June 10, 2018 My current set up with no jack shaft it says it will do 40 MPH, do you think my clutch would work with that? 1 Quote Link to comment Share on other sites More sharing options...
Muncie Posted June 10, 2018 Share Posted June 10, 2018 It might slip the clutch . Its not super overkill I'd try it might be a bit doughy or clutch wont fully engage at normal speeds. They grab fully at around 2200rpm recalculate back to that and see how fast that would put you. Depending where you intend to ride it might be sweet. Quote Link to comment Share on other sites More sharing options...
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