Carbon Buildup on my ZDZ 80
A little while back I emailed you about the carbon buildup on my ZDZ 80. I think you said that some carbon was normal but that it shouldn't be building up around the exhaust port. Anyways here is a picture of my engine with the muffler removed. Note the buildup around the exhaust port. The piston has a light buildup. The top of the piston has considerable build up. The cylinder wall is clean. The engine has always been run on Mobil MX1 2T (30:1 for break in and 40:1 since). I'm surprised at the amount of buildup given that I only have about 10 gallons through this engine. The engine runs great, starts easy, idles well and has lots of power. I'd like to keep it that way. Please let me know what you think. Is this a normal buildup? If not does it indicate a hot running engine? Your help is most appreciated.