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Yamaha 90 ETF, 2 stoke (1989) - runs rough

Siggi_007

New member
My 1989 90 ETF 2 stroke engine all of the sudden runs very unbalanced and rough. It seems, like it is not firing on all cylinders. I removed the plugs. The top 2 plugs look very oily, The 3rd pug looks normal. The engine also spills some oil during the startup progress. The waterfilter is new - it was just replaced in June 2010. Any ideas?
 
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