Need help on which drive

[rdhdfmn]

Hey guys. I’m new to the whole go cart thing and need some guidance. I bought a yerf dog for my grandsons and I don’t have a clue what to do for the drive. I don’t know if I just need a clutch off the motor to the sprocket or if I need the converter type. I have a 13 hp motor I’m putting on it. Also if you could help me with which yerf dog I have that would help as well. Thanks

 

[950speed]

For the drive I would use a 40 series torque converter for the size of engine your planning on using, if you but a kit of some sort it will probably have the drive sprocket with it, as well as everything else needed

 

[landuse]

Comet 40 series is what you need. You can get a centrifugal clutch, but it is going to cost just as much as the torque converter (because it is a 1" diameter shaft its for)

 

[bob58o]

How big are the rear tires (diameter)? How many teeth on the rear sprocket? Is the rear sprocket 1/2” or 3/8” pitch?

 

[rdhdfmn]

Well, I just realized that the crankshaft is tapered, and from what I have read that motor won’t work. Is that correct? I believe it has 8 inch tires on the back of it. There are 60 teeth on the sprocket that is on the axle. What would be a good size motor to get for this? It also came with this other piece but I don’t know what it’s for. Thanks for the replies

 

[JTSpeedDemon]

8 inch tires? I think you mean 8 inch rims. Those do not look like 8 inch tires. Those would be tiny!
Tapered crank eh? That engine was probably intended for a generator or the likes.

 

[rdhdfmn]

So I guess the tires are 18 inches. My bad.

 

[JTSpeedDemon]

Ok, that makes more sense.

 

[J.S.@SMS]

No, that engine wont work. From what I can tell that mystery part is a 20 series driven pulley. It looks like it is in pretty rough condition, but you might be able to clean it with some sandpaper and a wire wheel on a power drill.

 

[rdhdfmn]

Thanks for the help

 

[JP_in_STL]

They do make taper to straight shaft adapters but that usually means going up in size and that puts you into a different class of clutch which are more expensive. Shaft adapters are on eBay for about $60.

That 2nd piece looks like a jackshaft setup for a torque converter, not a centrifugal clutch. You would need a clutch driver and a belt, approx $100. You could pickup a Predator 6.5HP from Harbor Freight for $100 which is a 3/4in shaft and cleanup your existing clutch and run it for awhile.