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Discussion Starter · #1 ·
Got this old 1990 Fourtrax TRX300FW started today. Seems to be blowing some smoke and oil out of a loose exhaust manifold bolt. What could be the cause of it? Bike has compression and starts everytime right away. Are the valve seals bad?
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Could be bad valve seals or a bad oil ring or a damaged cylinder bore letting oil past the oil ring even though the compression rings are good.
 
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