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Old 08-08-2014, 05:12 PM
cschade cschade is offline
Motorized Bicycle Senior Member
Join Date: Aug 2014
Location: United States
Posts: 50
Default Use current bicycle gears??

Hello, I'm thinking about building a motorized bike using a Harbor Freight 3hp engine. Two questions -- first, on the Harbor Freight website it says the shaft rotates counter clockwise. Is this counter clockwise as viewed from the visible end of the shaft? Also, I'm thinking about using the pedals of the bike as a jackshaft. For instance, mount the engine so the engine shaft is sticking out the left side of the bike as viewed from the seat. Then, run a chain from the clutch to a sprocket mounted on the left side of the pedal crankshaft, opposite of where the sprocket is normally mounted. Then, let the engine turn the bikes gears. I've attached a sketch. Can this be done. I'd have to cut off the pedals and mount foot pegs somewhere else. Thoughts?

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