Spark Plug Check

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parky
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Mon Jul 09, 2018 5:33 pm

Having checked my plug after a run of about 15 miles it looked quite a bit lean. I have checked for air leaks and could find none. I have adjusted the mix screw slightly and have now cleaned and refitted the existing spark plug. How many miles will I need to do before a plug chop would give me a good indication of the current situation? I have done a chop after a couple of miles but the plug is still very clean and giving me no indication either way as yet.

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garry inglis
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Mon Jul 09, 2018 5:42 pm

What you need to do is put masking tape on the throttle side and Mark 1/4 1/2 3/4 and full throttle or wo wide open go for a run to warm the scoot up and try and find a stretch of road with a slight incline ride around at each setting and check the plug at each setting and this will show what throttle setting is lean it's a mess about but it's the only way unless you get it dynod witch I would recommend

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