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Smoking FE350

Joined Oct 2004
6 Posts | 0+
Hi,
Any tips on locating the source of oil causing my '96 FE350 to smoke? It is enough smoke to signal a problem but not an embarrassing amount. Here are some facts:
-replaced piston and rings
-honed cylinder quickly at the time of the new piston install
-smokes only after the bike is at operating temperature
-film of blackened oil in both exhaust ports
-the oil reed seems fine
-runs and starts fine
-bike smoked before and after piston replacement
-no oil in airbox
-I replaced the piston after my oil turned black and the bike started loosing power, after about 5 rides (now I know to check oil more often).
-completely flushed the motor of any remaining black oil
How can I tell if it is a result of valve problems vs. piston problems? Are there any tell-tale signs?
Thanks,
Greg
 
My 501 was burning some oil, and it was the valve guide seals. They were cracked and brittle, and I think one had popped off. I had some oil on the stems that I could see in the intake, so that provided me with some insight.
 

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