Kawasaki KH250 (1972-1976) [44/129] Operation

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42 1 Operation The diagrams below show die 5 spccd constantmesh return change type transmission of the S and KH Series Each selector fork is kept in its groove on the gear shift drum by a guide pin The other ends of the three forks set astride output shaft 4th gear drive shaft 3rd gear and output shaft 5th gear respectively As the shift drum turns the selector forks follow their slots moving to the right and left and sliding the gears into different meshing arrangements Neutral Location When the shift pedal is operated one full step cither down or up the shift drum rotates one full interval as decided by the drum pins Neutral however is located halfway between first and second so to make this half step operation easily possible three steel balls are contained inside the output shaft fourth gear and three grooves are cut into the output shaft where fourth gear rides When the output shaft is turning inertia keeps the balls away from the shaft and out of the grooves But when the shaft is at rest one or more of the balls drop down into the shaft groove When shifting from low to neutral fourth gear moves along the output shaft until the ball or balls inside it hit the end of the groove and stop the gear Since the groove extends only half the length of the fourth gear s travel this gear stops halfway and its selector fork is stopped by the gear thus preventing the change dmm from turning fully And therefore other gears do not mesh and all gears stop in the neutral position Transmission Gear Positions First Gear Neutral

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