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Old 04-09-2010
hath's Avatar
hath hath is offline
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Join Date: Jan 2006
Location: Slowtown,NSW
Posts: 34
Have you looked at your valves?

Hi there, I took my carb off to look at the jets cause my wr450 runs black out the pipe and i look down the inlet port and see that the two outer valves have a black crusty collar around the stems and a little black on the top but the centre valve is spotless. Also there was a yellow substance where the valve stem exits the valve guides don't know if it is oil or residue from fuel. Has anyone seen anything like this before, it's a bit concerning.
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