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Cleaning Off Carbon

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Currently have the head off my son's (new to us) 01 XR250 with the 280 kit. Having to heli coil the spark plug hole. Bike has not been jetted properly due to excessive carbon and puffing a little. I was just curious on how much I should clean the piston and head (without removing the valves if possible)?

Edited by kingsxjt

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