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Message: [QUOTE="Rich Rohrich, post: 714943, member: 16241"] That isn't entirely true. If there is a build up of carbon on the piston crown or combustion chamber it can often times stay red hot between cycles and cause the mixture to ignite ahead of the normal spark , in essence advancing the timing. With the power valve closed and the compression high this surface ignition can easily lead to further pre-ignition symptoms and overheat the crown to the point that carbon burns show up on the underside of the piston along with other heat related issues. Carbon tends to cause a lot of problems in a two-cycle engine. [/QUOTE]