Cheap torque converter possibly?

[dman]

So I'm building up my new (to me) kart and I have most of the problems figured out. I know that I need a cvt and my kart has a kit available, that I can't afford right now.

I was hoping that I could pull one off an old atv and use it until I can afford the proper one. But the shafts are different sizes.

Would it be possible to drill, or otherwise enlarge, the holes in the Cvt for the 4/3 shafts and add keys.

 

[anickode]

Drilling would not be appropriate. A lathe would be the right way to do it.

I assume you're talking about an industrial type engine with a keyed shaft, so you'd need to broach a keyway as well.

Plus ATV engines typically spin much faster, and thus will be weighted and sprung incorrectly.

Could you? Yes. Would it work well? Probably not without considerable tweaking.

What kind of kart and engine is it exactly?

 

[dman]

What kind of kart and engine is it exactly?

It's a 212cc (predator or clone) on a Murray explorer. But the atv was a 90cc yerfdog. I'm wanting to have something that will work just for now until I can get a proper converter.

 

[anickode]

It's a 212cc (predator or clone) on a Murray explorer. But the atv was a 90cc yerfdog. I'm wanting to have something that will work just for now until I can get a proper converter.

You can get a Chinese TAV2 clone on eBay for like $53 with free shipping... They work great - hundreds of us using them.

I can't speak for you or your financial situation, but my time and effort (not to mention frustration) would cost more than buying the kit, even if it meant waiting a bit.

This will be a lot more involved than ramming a 3/4" drill bit through it. Boring, broaching a keyway, working up a mounting plate, sorting the jackshaft and sprocket, working out the springs and weights so it actually does something etc... There's a chance your predator won't even spin fast enough to engage it, let alone get it out of low range.

Edit: looking at those parts, it sure looks like that's a belt centrifugal clutch, not a torque converter. I see clutch shoes and a cup there. I could be mistaken... I have never torn one apart before.

 

[dman]

Your probably right I'll just wait until I have income to spare.

Side note: the Murray explorer has a jackshaft factory, a 7 inch converter is bolt-on.