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Old 11-16-2008, 01:12 PM
Motormac Motormac is offline
Motorized Bicycle Elite Member
Join Date: Sep 2008
Location: Ontario Canada
Posts: 108
Default Re: Decarbonizing without disassembly

Old Motorbike, you answered your own question, carbon knock is the result of carbon buildup on the valves of 4-6-8 cylinder engines, also carbon buildup on piston crowns is really bad too as the carbon thats sitting on top of the piston gets red hot in the combustion chamber and burns a hole thru the top of the piston.The best way to clean it is to disassemble the engine, but thats not practical in most cases unless you are disassembling it anyway for something else. The only real easiest way to tell if you have carbon buildup is to check your plug and shine a light into the spark plug hole.
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