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2008 xcf-w 250 spark plug weep hole

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Hi guys, I've recently noticed that small amount of oil started weeping from mentioned weep hole. What could possibly cause it? I will be opening top end to inspect valve clearance and check piston/rings (and change if needed).

Also bike backfires quite a bit and bogs in higher gear/lower rpm (running rich?)

 

Any feedback appreciated.

20170806_121108.jpg

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Well, I believe that only serves to drain water from the plug base... 

Loose plug?

 

Edited by steve841

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