Join Date: Apr 2002
Location: Dandridge (Near Knoxville), TN, USA
Re: How does reverse gear system work?
The front shaft of the starter motor drives a gear train in the engine, which has a "sprag" (one way) clutch in the last gear. When the motor is used to start the engine, the sprag clutch grabs, locking the starter motor action to the gear which in turn spins the crankshaft.
The other end of the starter motor shaft drives a gear in the transmission. When the knob on the side of the bike is turned to engage the reverse gear in the transmission, the starter motor then turns the transmission gears when it is run. This only works when the engine is running, and the sprag clutch on the engine side will then not lock up, because the engine is running faster than the starter gear.
Rather clever arrangement to use the same motor for dual purpose. The sprag clutch however is a real witch to replace if it gets gummed up with carbon and no longer grabs when you try to start the engine! DAMHIK!
I don't want to achieve immortality through my work...I want to achieve it through not dying.
EX: '01 Black LT, BAT BYKE (Totaled at 110,000 miles)
IBA SS, BB, BBG, 10/10ths.
No bike now, but maybe in the future.