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Spark Plug Heat Range Chart For Visual Comparison.


jayzx10r

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Good post for sure! My plug colour has been kinda making me paranoid because they are a medium grey kinda inbetween pic #19 & 20 and I felt maybe it was running lean, but even the Clymer manual says light tan to grey is acceptable. I have never seen a grey plug before, all of my 2 strokes run light to dark tan which I was told to understand as ideal. At least I can breathe a bit easy now knowing grey is ok.

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Good post for sure! My plug colour has been kinda making me paranoid because they are a medium grey kinda inbetween pic #19 & 20 and I felt maybe it was running lean, but even the Clymer manual says light tan to grey is acceptable. I have never seen a grey plug before, all of my 2 strokes run light to dark tan which I was told to understand as ideal. At least I can breathe a bit easy now knowing grey is ok.

 

Unless the grey color is from the aluminum that the pistons are made from. :biggrin:

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