putting a 7 hp on a formally 150 chinese quad. have to use a jackshaft for proper rotation. Quad has a 50 chain w/ 36 teeth rear axle sprocket, jackshaft has 50 chain w/14 teeth. motor has 35 chain w/ 12 teeth. need sprocket for input of jackshaft. Due to the differences in the sprocket sizes and diameters i'm stumped. Tires in the rear of quad are 22". Jackshaft is 1/2 dia.
anyone have algebra for ratio's 2 diff chains
- Thread starter dthela
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r_chez_08
Should be in the shop...
I would go for approximately a 36t or larger on your jackshaft input if you can find that sprocket.
36/12=3:1
36/14=2.57:1
2.57x3=7.7:1
This will give you approximately 30mph @3600rpm. What engine and clutch do you have, and what terrain do you plan on? What is the weight of the kart? You may need to gear down further.
Oh and 1/2" is very thin for a jackshaft. I would reccomend 5/8" minimum depending on the amount of support. Pics?
36/12=3:1
36/14=2.57:1
2.57x3=7.7:1
This will give you approximately 30mph @3600rpm. What engine and clutch do you have, and what terrain do you plan on? What is the weight of the kart? You may need to gear down further.
Oh and 1/2" is very thin for a jackshaft. I would reccomend 5/8" minimum depending on the amount of support. Pics?
devino246
Official DIYGK Chem Nerd
Just to make sure you understand the concept, if your driveline has multiple gear-downs, you just multiply the ratios together.
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