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yz400 stumper...
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[QUOTE="Rich Rohrich, post: 61837, member: 16241"] Will - With all due respect to the guys at Stroker there is NO WAY on earth that a worn cam chain can cause the orientation of the cams to be off be exactly 180 degrees on this engine. The chances of the chain jumping time are miniscule, the chances of the chain jumping a FULL crankshaft revolution without noticeable signs of damage are infintesimal. While I agree that the cam chain should be changed regularly (mine get tossed after the second season), if the cams were timed correctly with the new chain then the likely reason for the cams being 180 out was the piston was not residing at TDC when they were checked. I really don't have the answer to your problem, but I have noticed a tendency of the earlier 400s to wash the oil off the cylinder walls when they sit overnight with the intake valves open, killing compression. Usually once the engine is fully up to temperature this is not an issue so it may not be relevant in the case of you idling up to the starting line. A leakdown test at the time of the problem is probably the only way to know for sure, but that may be a bit difficult at the starting line :( ------------------ Rich Rohrich == "Wisdom is not a product of schooling but of the life-long attempt to acquire it." - Albert Einstein [/QUOTE]
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Dirt Bike Brands - Other
yz400 stumper...
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