Looking for advice on refitting Sears 2 Seater w/ 6.5 HP 4 cycle

[billchang2]

Have an old Sears 2 seater which had 2.5 HP B&S. Bought 6.5 HP 4 cycle from Harbor Freight. Looking for chain and clutch to go faster.

Engine 3/4 shaft. Wheel sprocket is 72T, welded to wheel

Could I use a hi tooth count clutch (17T?) with this sprocket?

Will There be enough torque from a 6.5 HP 4 cycle to drive this 4.25: 1 ratio? I know that the old 2.5 HP motor would take a few seconds to get up to speed.

Where can I get a high tooth count 3/4 clutch?

What size chain should I use with this clutch and sprocket combo?

Thanks in advance

 

[Big Slappy]

I'd go with a torque converter setup instead of a centrifugal clutch. That way, you can get maximum torque as well as look for the correct size (14-17T) sprocket to attach to the jackshaft, and if it isnt enough torque just change the jackshaft sprocket instead of the whole clutch setup. The torque converter setup is much more expensive, though.


39-40 chain should be sufficient

I got everything I needed from gokartsupply.com

 

[Doc Sprocket]

If you could put up a pic or two to help us asses your needs. Also, give us an idea on what terrain you intend to drive, how much the approximate weight of the human occupancy, etc.

 

[redsox985]

TS, there are 2 s's in assess. Anyways, I doubt that a 4.5:1 gear ratio would work too well but, like said before, what kind of weight, terrain, and tires are we dealing with here?

 

[karl]

Have an old Sears 2 seater which had 2.5 HP B&S.

Does it happen to be one wheel drive? Dont scrap the motor, put it on craigslist so it can be used by someone else.