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Yamaha MX & Off-Road Dirt Bikes
Yamaha Powervavle Pictures
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[QUOTE="steve.emma, post: 1192872, member: 36039"] hi, i used to have a 89 yz250, last year with the steel bore great bikes.... anyway this problem used to be fairly common and Eric Gorr talks about it in his books, basically the valve has a stop plate on the l/h side of the cylinder that limits the valve from turning too far when it moves. however the stop plate is made of alloy and over time it wears and allows the valve to spin further than it should. after a while it can turn so far that it starts to hit the piston rings and makes a ticking sound, when its real bad it can cause the rings to snap and make a real mess.... easy to repair however, replace the stop plate and file the valve to give a little more clearence. check this by turning the valve to full travel while the head is off looking down the bore as the piston passes the exhaust port. hope this helps. :cool: [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
Yamaha Powervavle Pictures
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