I have a YerfDog frame that is in decent shape. The engine and clutch are gone. I want to make a cart for my 7 year old so I don't want it to go very fast. I want to use a centrifugal clutch (10 tooth) on a HF 6.5 hp driving a 25 tooth sprocket on the jackshaft reducing it to another 10 tooth sprocket driving the 40 tooth axle and 16 inch rear tires. If my calculations are correct it would go about 10 mph. Has anyone used this type of setup? What do you think?
Why not use a centrifugal clutch
- Thread starter sdavisrt
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BradenM
Etre Et Durer.
Why use a 6.5hp engine if you only want it to go around 10mph? Perhaps downsize engine, and cut costs.
Kenny_McCormic
Kartless....
That will be fine, it will climb/pull anything. Thats 17mph by the way, 1440 rpm at the jackshaft full throttle(3600rpm). You want somewhere between 68 and 72 on the axle for 10mph.
I have a HF 6.5 sitting around so it's cheaper than buying a new one. and in the future I would upgrade to the torque converter that it should have.
BradenM
Etre Et Durer.
I see. Best of luck mate 
Jerryburger
Admiral Annoy
With that gearing, it'll climb trees. You could also limit the throttle lever opening on the HF engines on the linkage.
r_chez_08
Should be in the shop...
sounds fun for offroad, with that gearing, it must have massive torque
i wish i had a clone layin around. sure would beat my 5horse tecumseh. but yes. with that setup, you could keep him in a cart until he turned 14 then get him a bigger engine. that 6.5 can make a lot of power by the way. good luck
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