Healthy plugs?
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Yea, you need to do something about that. Your losing hp and you could be washing your cylinder walls. Thats no good. Also, you probably arent getting that great of gas mileage.
You should read a plug closer to the base and not at the tip. Also if you really want to read the plug do a third gear pull and kill the engine just after the top of the pull, then take the plug out and check it with a light at the base or lower mid insulator.


