Originally Posted by
bigmatt
looked a little more worn then mine. I did mine at 2 gallons. also I am using byrons gen2prodriver30%. I like it, but think my run times have gone down. even after leaning the needles. It definitely tunes easy -good power lower temps. Takes a while longer for the engine to warm up with the byrons. I am going to finish out the 2 gallons then I may go back to my sidewinder 30%. that seamed to be all around good for me. did not need to lean anything out to far,good mileage and power. was going to try torco, but have read that you need to really lean it out for good results. I may change my mind and stay with byrons. I would like to try the massive mods nitro, but god knows what it would cost to ship to me. also I see on your head that it is black. are you running a hot plug? os-p3. or to rich or is that how your fuel burns? All of my engines are a beautiful light brown. Both head and plug.
He was running the OS p3 plug. I bought some of the O Donnell 77T and 97T plugs to try out. I might just swap one in from the get-go.
Originally Posted by
MassiveMods
Hey GTXRACER
Looks like the tune is rich bottom and lean top. The scrape mark on the piston can come from 2 things
1 Plug element or other head debris
2 lean high speed runs or its been flipped on its lid and over revved.
I honestly wouldn't know if he had it upside down on the throttle or not. It's not a scrape or gouge but a mark from one of the detonations. However, it may be from having a rich setting (which he said he ran it rich) and the plug element dropped in there. Either way, it wasn't anything more than a surface difference. Should I be worried?