1976 YAMAHA XS 500 replace the timing chain with the original part number 94862-09104-00

SOURCE: gladiator chain problem

I hate to give you the bad news but it is not likely the damaged sprocket is under warranty. The sprocket was not bent when it left the showroom floor and Yamaha Corporation has no control where and how you drive.

Chains should run true and not be forced to move side to side to fit a bent sprocket. The sprockets are hardened steel. It is not a good idea to bend them back and forth.

You didn't say which sprocket had the problem. A front sprocket will cost around $30 and a rear sprocket will cost around $60. Installation will also cost unless you do it yourself.

Please rate this solution. Thanks!

SOURCE: yamaha tt 600 re.removle of drive chain,fit new

just find the chain lock and take it off then take off also the engine spraket cover.

SOURCE: Yamaha warrior chain.

HELLO; Heres all you should have to do this,set your quad up on a atv jack or on a milk cartoon.Loosen the four bolts that hold the rear bearing carrior and back off your adjusters then push the carrier forward till it stops,relay your chain and adjust it leaveing a little slack, tighten your mounting bolts then, something I do, spin the rear tires to see if the slack is right if not loosen the bolts and proceed again with the proceedure turning out the adjusters a little more look at the chain as you dothis and you will see the slack in the chain on the top. GOOD LUCK.

SOURCE: Yamaha SR 400 timing chain

Hi There honzakot
Yup, SR400 and 500 are the same engine in this respect. Seems most top end parts for the 500 fit the 400. . Check this link (yoshimura) for some supporting evidence. sr400 jumps straight to the SR500 at Bike Bandit also.
regards robotek

SOURCE: 1980 yamaha 400 xs starter spins engine doesent turn over

The starter clutch needs to be replaced. At the other end of that chain is a wheel with a couple slots cut at angles. Inside each of these slots is a small cylindrical piece of metal. The whole unit fits over the end of the crankshaft and because of the angle of the slots those cylindrical pieces of metal (which move freely in the slots) will be forced against and grip the crankshaft when the starter is operated. If they become worn down they are no longer able to exert enough pressure on the crankshaft in order to turn it. Buying a starter clutch 2nd hand is not recommended. If you are unable to source one from a bike shop, try and have them made. Take the old ones to an engineering shop. Unless you know how to temper/harden metal of course.