Soak the pistons in cold parts cleaner. Soaking the pistons overnight will usually loosen the carbon deposits.
After soaking, wash the pistons in a strong solution of laundry detergent and hot water.
Clean the remaining deposits from the ring grooves with the square end of a broken ring .
Wash the pistons again in a detergent solution or solvent.
Rinse the pistons in clean, hot water.
Dry the pistons with compressed air.
The pistons have an oil passage cast into the top of the piston for cooling purposes. When cleaning the pistons,
make sure the oil passage is clean and free of debris.
