May 2, 201016 yr A friend dropped off a TY80 for me to repair, and has since bought another bike for his lad and given me unlimited use of the TY until I can buy it off him. Nice. The bike had hundreds spent on it, including a full engine rebuild, so is in great shape mechanically. But suffers from a gear-change problem
May 2, 201016 yr Nice photos - sad gear teeth on the clutch basket but I have seen worse Back on topic about the shifting, one thing you should check is that the hooks that pull on the drum pins are exactly the same distance from their pins when the shift lever sits where it wants to. To set it up to check this, put the indent plunger back in, fit the shift lever and make sure you have it properly in a gear. Once you have done this you can adjust the eccentric screw inside the centering spring to get the hook distances equal.
May 2, 201016 yr thedktor , Those usually sell on Ebay for under $5.00 (about 2 pounds). If you can't find one send me a private email. I have several but I think shipping would make it "not worth wile". Alan
May 3, 201016 yr Author Thanks for the reply feetupfun, good info. I guess these marks should line up: Was thinking I need to get the butchered screw off first but the adjustment is the other end of the mechanism of course.... Alan Edited May 3, 201016 yr by thedktor
May 4, 201016 yr Author While I source a clutch I put everything back together loosely while I concentrate on another bike. I had some suspicions why the cog had shredded its teeth but was quite shocked when I discovered the truth. The crank end is several millimetres out of true!!! On both sides, it
May 4, 201016 yr The last bike I saw that had the primary drive gears damaged like yours was a TY175. The kickstart knuckle clamping screw head had punched a piece out of the clutch casing and the piece had fallen inside. Instead of taking the cover off, the owner patched the hole from the outside. Eventually the piece of casing went between the gear mesh of the primary drive, bending the gearbox shaft and knocking pieces off the gear teeth on both gears in the process. My guess with yours is that something solid went through the gear mesh zone and bent the crankshaft in the process. By the number of damaged gear teeth on the driven gear, the rider kept riding it despite what must have been quite a crunchy-sounding motor. Yamahas motors are truly tough.
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.