ToRqUe
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I recently was cleaning out my OS .18 and my TRX 2.5. I Have ran around a half a gallon through my .18 and the pistion and sleeve is in great shape amd alot of compression and i really didnt have to do anything major to clean it. My TRX 2.5 has a gallon throught it and the pistion has turned black and so has the top of the sleeve and around part where the glow plug come out. I figured where the black was where the combustion was happining but why is it pitch black ??? i tried 2 get it off but it wont come off. I compared it to the pistion that came w/ my Hot Bodies Tornado. And the Hot Bodies' pistion if still silver and it has has around 5 gallons through it. What could this black stuff be ??? Am i running bad fuel ??? I used Top Fuel for this engine only , the hot bodies engine got Blue Thunder and the OS .18 got O'Donnell.