Question for you Ray. I have an onroad Nova 21+3. It only has about 1.5 gallons on it and was running great when the tune went off and will not tune back in right. Upon inspection I noticed that the piston on the exhaust port side is black from top to bottom. Sounds like a lot of blow by to me. The piston isn't scratched, just black. Do you think a pinch might fix this? The motor is so new with a great crank that I would hate to scrap it already.