Hey guys, question for you. Replaced the con rod in my .21 5 port today after approx 2.5 gallons (as recommended). Engine still has great pinch but can now be turned over by hand out of the car ¨relatively¨ easily.
When I took the head off I noticed the turbo button was really black. Top of piston was pretty normal. I have run the turbo head for 6 tanks. When I removed the standard button to fit the turbo, it was perfectly normal. Engine did get a little warm during 20 min final last week when O ring in tank lid popped off seat after re-fueling stop (it was starting to lose power in last 3 mins or so). Would this cause the blackening on the button and glow plug area, or is this just a combination of new plug type, fuel etc ?
Any insights would be appreciated

PS: RETRO RC, dropped that pipe off with Jerry at the shop today.