mini bike motor

[rocko]

just last weekend i bought my friends mini bike frame for 40.00 u no that old school type i have both wheels including the one with the sprocket attached so now all i need is a motor.well just this morning walking down my ally i found a toro snow blower and it runs perfect and even has electric start the only problem is it is a two cycle motor not a four.is there any way i could use it maybe with a jack shaft to lower rpms so i could ase a clutch and if you know could you tell me the gearing

 

[RobertD]

go kart clutches lock up at 2200 RPM. So, you'll need to get it down to around 4000 RPM max.

 

[rocko]

gearing

so what gearing should i have

 

[RobertD]

it's going to depend on what gears you can find available, but in a "pure" sense...

if the engine turns 10,000 rpm, a 2.5:1 ratio brings it down to 4000 max (at the clutch). Then your 12 tooth clutch and a 72 or 60 tooth final sprocket.