Sprockets?

[mycoyote]

New here and need help.recently purchased a klipper kart with a 13hp Honda engine on it,has 60 tooth axle sprocket and 13"tall tires.question is how many teeth should the drive sprocket have?thanks for any help

 

[Hellion]

10. 10 would be good, giving you the proverbial best gear ratio of 6:1.

I might assume that your drive sprocket is attached to a centrifugal clutch. No wait, I'm not going to assume. ...carry on.

 

[anickode]

10. 10 would be good, giving you the proverbial best gear ratio of 6:1.

I might assume that your drive sprocket is attached to a centrifugal clutch. No wait, I'm not going to assume. ...carry on.

13 hp, so a 1" shaft.

What pitch is the axle sprocket? Do they even make a 1" clutch with a 10t #35 sprocket? You need to know the pitch of the sprocket before you buy.

With 13 hp, you could probably pretty easily get away with a 12t.

 

[mycoyote]

I believe the pitch of axle sprocket is .5. The kart came with a broken clutch that was a 17 tooth but I thought that was a bit much.thanks for the info guys.much appreciated.

 

[mckutzy]

They do... It's basically a custom job, it has a stepped driver shaft, So it'll sit on the end of the PTO shaft, and have a reduced diameter to accommodate the 12t sprocket... 12 I think is the smallest they have for this type...


Edit: let's see som pics of the current clutch you have... You might be able to convert.....

 

[mycoyote]

Current clutch is missing 1 spring and some i.d. pieces cause it's way too sloppy on the 1 " shaft. Was thinking of buying a Hilliard but the smallest tooth count I can find is 14 .is that brand any good?

 

[mckutzy]

Yes, I have one..
Very nice, you can use various strengths of springs to tailor the engagement point....

 

[OzFab]

0.5"=#40/41 so 14t sounds about right; however, that will give you a drive ratio of 4.2:1 which is a bit tall but, with 13hp & 13" tyres, you may be ok (don't quote me on that)...

Chances are the kart originally had a torque converter...

 

[mycoyote]

Would I be better off trying to use a torque converter instead of a centrifugal Clutch?

 

[KingCobra]

Would I be better off trying to use a torque converter instead of a centrifugal Clutch?

Of course you would be and if you have room for it. Any photo of the engine area would be cool. Just use a jack shaft set-up with a 1" driver to the appropriate 'driven',and use the jack shaft sprocket to feed your axle sprocket.

Check out this thread and hunt EBAY for a DRIVER clutch for a 1" shaft.

http://www.diygokarts.com/vb/showthread.php?t=12946

https://www.gokartsupply.com/4044seri.htm

 

[anickode]

Would I be better off trying to use a torque converter instead of a centrifugal Clutch?

A clutch with 14 teeth would more than likely be just fine on that setup. Clutches however, like full or nearly full throttle. If you're planning to do trail riding, climbing steep hills, or driving around slowly, a clutch is not what you want, regardless of gear ratio.

A torque converter with a 12t sprocket, on a 13 hp engine driving a 60t with 13" tires would take off like a bat out of ****.

You'd need a 40 series to handle that kind of power though. No TAV2 for you.