I have a question on which clutch I should get. I have a 6.5 predator engine, 17inch tires with a 60 (#35)tooth sprocket on the axle. It's a homemade kart, I bought from a friend. When I bought it,it had an old 5 hp engine with a 12 tooth clutch and it just wasn't taking off very fast so I decided to buy a new engine. I put the clutch from the old engine on it and when I tested it the thing smoked like crazy and was red hot. I'm not sure if I have the right gear ratio for the engine. I believe it's a max torque clutch, but it's an old one. Any help would be great!
Gear ratio
- Thread starter Andrewc
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firemanjim
Just kartin' around....
Welcome to DIYGK! Im no expert but i think you want more like a 72 on your axle. Ideal ratio would be like 6:1..... Im on my phone so its hard to post link. Use search bar for gear ratio calculator. ..... we have one on this forum. Someone with more experience with gear ratios will chime in shortly....
OzFab
Well-known member
5:1 is a bit steep, even 6:1 is pushing it with 17" tyres. The larger the axle sprocket, the better it'll be.However, there's always a trade off; you either have good acceleration or a high top speed, you cant have both...
grif
New member
30 series torque converter
I have the same 212cc Predator on 18 inch rear wheels. I use a 30 series comet torque converter (www.bmikarts.com on sale $140) I use a 9 - 60 tooth ratio. Decent acceleration and top speed. Maybe not the best and depending on the chain you use, you might have to have a little different setup (I dont think #35 chain goes down to 9 tooth, so maybe 10 - 66 or 70 tooth), but it's a start?
I have the same 212cc Predator on 18 inch rear wheels. I use a 30 series comet torque converter (www.bmikarts.com on sale $140) I use a 9 - 60 tooth ratio. Decent acceleration and top speed. Maybe not the best and depending on the chain you use, you might have to have a little different setup (I dont think #35 chain goes down to 9 tooth, so maybe 10 - 66 or 70 tooth), but it's a start?
It would definately be better, but 17" tyres are still big. You are going to have to test. If it were me, I would be gearing at least 7:1 with those tyres
I've only go room for the 72 unfortunately
Them that is what you have got to try. You will only know if you try it
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