I never have had much luck with some type of snake oil freeing up valves that are stuck from setting long periods of time. Ones that are fuel gummed up yes, but not rust or carbon.
I would pull the head off and free them up. I have reused head gaskets on odd ball stuff before with good results. I usually clean the head and block up like you would for a new gasket. The spray both sides of the head gasket with Copper Coat spray. I hang the gasket up on a piece of wire. I put several coats on. Letting it get tacky between coats. Then install it when the last coat is dry to the touch.
I have done this on a lot of small engine gaskets. 90% of the time it works with zero problems.
You can also look at the valve seats. They may need resurfaced too. If they are rusty and pitted the motor will not run correctly until the valve and seats are at least lapped if not too bad. They will need ground if they are too bad.
This post was edited by JD Seller at 19:59:15 06/11/13.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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