Barstool Kart Jackshaft Add-on

[tmarsh0494]

Hey guys first post here. I have a Barstool kart I bought a few years ago because I thought it looked fun. I have since made a few necessary modifications to it for stability and steering. Its a blast to ride, pretty quick. But I have found myself trying to use it as a yard tractor too, as redneck as that sounds. Ive used it to pull a lawn thatcher, aerator, garden cart, and a small tractor trailer around the yard many times, but the clutch does not handle that well especially trying to maintain a slow speed for the thatcher or aerator.

Im wanting to add a jackshaft directly above the rear axle. Two 10 tooth sprockets to keep the same ratio it currently has when riding it for fun(would also keep cut down on sticks getting caught between the chain and sprocket). I also want to add a large sprocket to the shaft to create a low gear for using it with my lawn equipment. What would be some recommendations on how to go about this? Space is definitely an issue on this thing. And I don't have the space or need for a tractor if this can do the job.

At least, could someone tell me how many teeth should the larger sprocket have to give me my slow speed with the clutch fully engaged?

Briggs Intek 206cc, 10 tooth clutch to a 40 tooth sprocket with 11x6.5-5 tires.

Thanks for brainstorming.

 

[Denny]

You could just go to a 30 series TAV II CVT with a Genuine Comet belt and it would do exactly what you want.

 

[madprofessor]

Denny's right about the 30 series CVT, they start moving at about a 3:1 belt ratio before gradually shifting. I just don't know how you'd fit it in there, but then again, I've never been able to fit my own feet into a pair of cowboy boots.
Jeremywell Torque Converter Go Kart Clutch kit 30 Series 1 inch 12T #35 Chain | eBay
Doesn't look like you have the ground clearance for a larger axle sprocket. You could however, look for a smaller clutch sprocket (9-tooth?) to get more torque at a slower speed.

 

[tmarsh0494]

I think it would fit if I moved the seat post. I’ll have to double check.
Could it be mounted vertically on the engine(driven pulley above drive pulley) or would that cause too much strain somewhere? I do believe it would fit that way.

There is no room for a larger sprocket on the axle, that one already takes a beating. I need to form some sort of belly guard for it.

 

[anderkart]

I seen serveral CTV's installed in the upright position:

 

[tmarsh0494]

Well then I can definitely make it work with it mounted upright.

 

[madprofessor]

Attaching a couple of pics of TC mountings, horizontal with a slight downward angle on a minibike, and straight down on a gokart.............

 

[tmarsh0494]

Update- torque converter installed. Can’t believe it fit this way. Only had to trim a small portion of the “duct” piece that guides air over the cylinder fins, and the cover for the exhaust pipe/muffler. In my short test drive tonight, it is going to do exactly what I need it to do. And seems to be overall better than the centrifugal clutch in the short time I rode it tonight. Thanks for the suggestion.

 

[Denny]

Glad we could help. Think of it this way, you just added an automatic transmission. And it has an almost infinite number of gears!

 

[karl]

Can’t believe it fit this way.

That's a tight fit, with the OG tank and muffler. Impressive!

 

[madprofessor]

Awesome job on that TC! Please say you'll never ride it without that cover on it!

 

[tmarsh0494]

I did ride it for about a minute without the cover just to test and see it function and check belt alignment. But yes, the cover is on and will always be on!

 

[madprofessor]

I did ride it for about a minute without the cover just to test and see it function

Just to scare you for your own good: Suzuki 90 enduro with part of the sidecover extended to cover the drive sprocket, that piece broken off and exposing sprocket before I got the bike. Test puttputt idle around out front by the edge of Adams St., pants leg got caught in chain/sprocket, sucked bare foot up tight to case.
Didn't stop it right, fell over to left side after stopping because foot was stuck. Passerby locked up his brakes, jumped out of his car hollering "I'll save you!", and started dragging the bike off of my leg. Bare foot still pinned to the bike.
Ground the meat off my foot down to the bone on the ragged asphalt. Got blood poisoning from the wounds, and nearly killed the podiatrist with my bare hands that had to gouge out the infected craters later to save my life.

I did ride it for about a minute without the cover just to test and see it function

That was a minute longer than smart. As if I have any room to talk. Sound like a mother hen, don't I? Comes from experience.

 

[Denny]

Mad, that could not happen to him. It’s in the wrong spot to do that. It might however steal his marble sack and marbles.

 

[madprofessor]

that could not happen to him. It’s in the wrong spot to do that.

??? I might be looking at the wrong pictures. The red and black frame with the checkerplate footboards has the cover sitting on the seat, and the CVT is right up against where the left ankle would be. Still, YEEOUCH! My marbles are too precious to even think about that cat's-eye scenario. I think my voice rose 3 octaves just reading that.

 

[Denny]

Like I should have said, I’d give up a little meat off my foot to keep my marble sack and marbles!