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Dirt Bike Brands - Other
yz400 stumper...
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[QUOTE="kevkon, post: 61848, member: 21927"] If the bike had been running ok before this problem you can be certain that the timing could not have been far off, certainly not 150 deg. Since you are judging the compression loss by turning the motor over, it must be substantial. I am not too familiar with the Yamaha motor, but the only thing I know of that would cause the symtoms that you describe is a timing gear slippage. I know you have been told that the Yamaha gears don't slip because they are tough to get off. Well, I have seen gears that would not come off easily and nevertheless still spun on the shaft (thats why keys are used).I really don't see any other way your timing could be that far off. ------------------ [/QUOTE]
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Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
yz400 stumper...
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