Re: compression for QD-17

[wiscoboater]

Setting the motor on the floor or bench with the pistons facing up, head off and both pistons at about half way up the hole fill the cylinder about 1/2" over the rings with Marvel mystery oil. Let it sit a few hours, moving the piston up a little bit, then down a bit every 20 minutes or so. Dont move it enough to loose the oil down the ports, but just enough to work the rings a little up and down. This works well for loosening up a tight carboned up set of rings. It works for stuck pistons as well. I got a very stuck Champion 1J loose using this method.