"I've successfully used PB
"I've successfully used PB-Blaster and an impact wrench to free up an old 1.5 Viking of mine. I originally filled the cylinders with 2-stroke oil and let it sit for over a month with no luck.
I read about the impact wrench on one of these forums and thought I'd give it a try, since I have several old outboards with frozen powerheads. I purchased an electric impact wrench on sale at Canadian Tire, and PB-Blaster at Big Lots. After letting it sit for a few days, I put the impact wrench on it for a few seconds and it freed up. I kept spraying in the spark plug hole to keep it well lubricated and kept using the impact wrench to make sure it was freed up completely. I knew the history of this motor, and knew that it was seized from sitting in my father's shed unused for a few years.
I had nothing to lose, and got it running again. I was lucky, the rings appear to be free in the grooves and didn't break.
I think any good lubricant would have worked, and that the vibration from the impact wrench is what did the trick. I've only done that one motor, but got smart (I hope) and sprayed the cylinders of the other motors before putting them away for the winter. I'll try them in the spring.
Good luck."
