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Top End Cylinder and Piston Pics
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[QUOTE="spanky250, post: 144561, member: 20897"] A scotchbrite pad is not the same thing as steel wool. Don't use steel wool on your cylinder plating, you run a good risk of damaging it. I use a wire brush to get the carbon off the top of the piston to read the numbers. Yes, the excess carbon is probably from a combination of rich jetting and not running the engine hard enough to burn it off. Taking a plug reading is only useful for getting the main jet correct, it won't help you with the other jets. You jet the needle and pilot circuits by feel and response. The "knocks" you say you heard are probably pre-ignition, caused by hot spots in the carbon build-up. Once you have a fresh top-end ( I still say you should change the piston, but that is just my opinion), switch to 32:1 (26:1 if you like to rev the snot out of your engine all the time) and start jetting the pilot first, then the needle, then the main.Plug color is not a good tool for jetting, other than a WFO reading for the main. It is more useful for telling you if the plug heat range is correct for your riding conditions. [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Top End Cylinder and Piston Pics
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