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black goop on outside of spark plug

Posted: Mon Jul 17, 2017 5:45 pm
by Joshoakley15
black goop on outside of the spark plug
really rough at top end and barely accelerates at initial take off
i have a prima pipe,contra 1500,and 5g roller weights
mainly concerned with black goop on outside
wont let me add picture but it is black sticky goop