thedktor Posted May 2, 2010 Report Share Posted May 2, 2010 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 Quote Link to comment Share on other sites More sharing options...
feetupfun Posted May 2, 2010 Report Share Posted May 2, 2010 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. Quote Link to comment Share on other sites More sharing options...
alan_nc Posted May 2, 2010 Report Share Posted May 2, 2010 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 Quote Link to comment Share on other sites More sharing options...
thedktor Posted May 3, 2010 Author Report Share Posted May 3, 2010 (edited) 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, 2010 by thedktor Quote Link to comment Share on other sites More sharing options...
alan_nc Posted May 3, 2010 Report Share Posted May 3, 2010 Sent you a message. http://i226.photobucket.com/albums/dd165/Alan_nc/80002.jpg Alan Quote Link to comment Share on other sites More sharing options...
thedktor Posted May 4, 2010 Author Report Share Posted May 4, 2010 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 Quote Link to comment Share on other sites More sharing options...
feetupfun Posted May 4, 2010 Report Share Posted May 4, 2010 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. Quote Link to comment Share on other sites More sharing options...
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