Marvel Mystery Oil (MMO) is your friend.
Put a tablespoon or two into each of the cylinders via the spark plug holes. Turn the engine over by hand to distribute the oil and let it sit for a day. Repeat. After a couple of days, try the compression check again. The valves will eventually loosen, but it may take time.
Once running, add a pint of MMO to the oil to get at the lower end, and some in the gas to get at the upper end. You may get some smoke, and the plugs may run a little dirtier, but it will clear up most stuck valve problems. After one tank of gas with MMO, you should probably return to straight gas, but there's no harm in running with the MMO in the oil all the time..
Put a tablespoon or two into each of the cylinders via the spark plug holes. Turn the engine over by hand to distribute the oil and let it sit for a day. Repeat. After a couple of days, try the compression check again. The valves will eventually loosen, but it may take time.
Once running, add a pint of MMO to the oil to get at the lower end, and some in the gas to get at the upper end. You may get some smoke, and the plugs may run a little dirtier, but it will clear up most stuck valve problems. After one tank of gas with MMO, you should probably return to straight gas, but there's no harm in running with the MMO in the oil all the time..
Comment