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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
yz250 knocking
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[QUOTE="helio lucas, post: 1214972, member: 78346"] it could be the piston banging on the head, try to fit a thicker gasket in the base of the cylinder just to have sure, or else try to get a solder wire trough the spark plug hole and bend it to touch the cylinder wall, then move your kickstarter to crush the solder... if the piston cuts the wire you have your piston hitting your head. if not, just mark the wire or dont touch at all, probably is your big end and the rod. maybe with too much piston to cylinder clearence too... if no one touch your top end since the rebuild and it was good some time ago forget the idea of piston hiting the head i would recomend you to ask a nice shop to rebuild you big end with a new connecting rod, because besides the dificulty to get it right you must have some special and expensive machines... sometimes its cheaper to buy the cranckshaft ready to assemble then is to get your rebuild... do a good search.. its not very difficult to get your crank off, if you know what your are doing, otherwise ask someone to do it since you could easy wreck or damage something oh, change yor bearings to.. good luck [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
yz250 knocking
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