Honda Nighthawk 700s Transmission broken shift fork

This is one of the problems with the transmission. This is a shift fork from an 85 Honda Nighthawk 700s. The clutch had huge play in it and was slipping and grabbing, slipping and grabbing. Looks like this is the primary problem, but I'll have to install the new (used) forks and see if the play is gone. The spare engine has a MUCH tighter transmission

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How Sequential Manual Transmissions Work! (Animation)
http://www.bring-knowledge-to-the-world.com/ This animation explains the basic principles of sequential manual transmissions as they are often used in motorcycles. For this animation a 5-speed gearbox is explained. Contents 1) Basic components (shift forks, gear shift drum, pins, gears) 2) Using the gear shifter and the claw arm (gear shifter assembly) 3) Shift forks and their cam follower pins 4) Input und output gears 5) Shifting different gears 6) Upshifting without using the clutch





Honda Nighthawk 700s transmission
Finished the teardown of the spare engine on the Honda Nighthawk 700s. I need the shift forks for the other engine.





700S_Transmission.avi
Taking apart a Honda NightHawk 700S engine/transmission. This bike would pop out of second gear under moderate to heavy throttle.





Honda Nighthawk 700s transmission: How It Works, shift drum
How a motorcycle shift drum works: The shift drum controls three shift forks by a stub that rides in a slot. The slot moves the fork which moves a slider gear. The slider gears has pegs that fall into holes in the driven gear. The slider gears engage on either side, 3 sliders X 2 sides = 6 gears. Sometimes if your gears clash, the slots and dogs will round off, this can cause the gear to pop out when you apply torque. The drum is shifted with a ratchet system operated with your foot.




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