Do folks tend to narrow your spark plug gaps when you increase compression? Is there a rule of thumb, e.g., if 0.04 at 9:1, then x% of 0.04 at 11:1?
H hivolt132 · Premium Member Joined Jan 27, 2007 · 469 Posts #5 · Feb 20, 2007 View full thread Go to nightrider.com he has the formula.