Howdy from West Texas

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jamyers

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Greetings, all!

Great site, I've been lurking for awhile and finally got off my rear end and registered.

Our gokart project is an old Thunder-Kart 2-seater. We welded on about a foot and a half of frame on the back, added a 1" live axle, went from the worn pull-start Briggs 5 horse to a worn Briggs 8-horse with electric start, using the old engine plate to mount the battery in front of the new engine.

The only issue we used to have was that the driven sprocket on the live axle was noticeably smaller (72 teeth, 31-pitch chain) than the old one (I forget the tooth count), so even with the 8-horse engine it was a bit of a dog out of the hole with 2 kids (or my 190-lb butt), but the top end was pretty spectacular/scary. :wai: (I manage and live at a Church Camp, so there's a good bit of room to go blasting around, although none of it's paved.)

Unfortunately, the Briggs seized up last weekend. I haven't torn into it yet, but I'm betting it's toast.

So now I've got this other Briggs 5-horse that's in pretty good shape, only I'm thinking that it's going to really need some help, like one of those Comet torque converter CVT's to help it get going, unless anybody here has a simpler idea.

I've got plenty of tools and pretty good mechanical experience, and I'm open to any suggestion - especially the half-baked ones! :D
 

Doc Sprocket

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Welcome to the forum!

Feel free to start up a thread or two- maybe showcase your kart, and perhaps one in the engines section to deal with that seized-up powerplant of yours....
 

used2jeep

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Greetings, all!

...
So now I've got this other Briggs 5-horse that's in pretty good shape, only I'm thinking that it's going to really need some help, like one of those Comet torque converter CVT's to help it get going, unless anybody here has a simpler idea.

I've got plenty of tools and pretty good mechanical experience, and I'm open to any suggestion - especially the half-baked ones! :D

Maybe the least expensive way out, as far as get up and go, would be to sacrifice your top end speed and gear that puppy down some. New sprocket is in the $5-$20 range.

If that is in the neighborhood of suggestions you were looking for anyway... :eek:
 

jamyers

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Maybe the least expensive way out, as far as get up and go, would be to sacrifice your top end speed and gear that puppy down some. New sprocket is in the $5-$20 range.

If that is in the neighborhood of suggestions you were looking for anyway... :eek:

That's my other thought as well...the sprocket I've got has a seperate hub that the sprocket bolts to - I don't see any brand names or numbers on it, are they universal?

I'll get some pictures and post.
 

used2jeep

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Well, I am just about at the sprocket purchase stage myself. As far as name brands go AZUSA has a bunch of different number value sprockets. My choice will be the split ring variety so you don't need to dismount your axle to put on your new sprocket. The only other difference is that there are mini sprocket hubs that have approx 4 mounting bolts and regular sprocket hubs that have abotu 6 mounting holes (3 per side in the split style case). Maybe you could call one of the resellers and say "I have a wheel that is xx" tall. What is the largest sprocket that you have that would fit?"

Or something similar anyway.

* the only other thing re: universality is to make sure that the chain size (35/40, etc) is correct.
 
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