Can?t get oil gurgle after 10 months idle

[DonFromTX]

I have, often on auto and tractor engines. The open valve face tends to pick up some oxidation, which allows for some leakage. I have never pulled a Rotax head but would suspect the same there. Try running a compression check on a Lycoming that has sat for a time, same effect. Compression comes up after even a short run.
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Originally Posted by EXflyer

Why would the valves not seat? Have never seen that on any auto engines that I have worked on.

[DonFromTX]

You might be right there, had not thought about it much actually.

Originally Posted by Piper J3

I think the reference was to lifter bodies pumping up with air if oil not purged correctly. You'd have to draw air into oil pump/pressure galleries.

[rv7boy]

Jim, and others, you might be interested in reading this article on the Rainbow Aviation web site.