Carbon Buildup

While changing the header on my bike, I noticed that there seemed to be a significnt amount of carbon buildup when I looked into the cylinder hole. Is this normal on these bikes? Im not used to the high perfomrance 4strokes so I was just wondering. Thanks in advance, Denis

Yes it is! I had a 1/8" thick layer on mine when I had the engine rebuilt and they cleaned up all the build up on the exhaust ports and head. :naughty:

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