Floog,

If the engine has some time on it....probably a pretty good idea to do a compression check. Might consider the type, grade and condition of the oil too - if it is old, tarry and thick it will take longer to burp.

FWIW......try the burp after shutdown before the engine cold soaks....I started doing that long ago and find that hot oil (meaning thinned somewhat) flows a lot quicker than cold oil. Obviously I do burp & check before cold startup - but it only takes a few blades since most of the oil stays put in the tank after the hot burp...at least with the S7 configuration (also a trigear) and current Rotax oil filter on the 912.