I've never had any trouble burping the engine hot or cold. Usually two or three revs done slowly. I think one thing that makes different installations act differently could be the location of the oil tank. Rotax says that the oil tank should be located so that the normal oil level in the tank falls between the centerline of the prop hub and 15 inches below the prop hub. Mine is located so that the oil level in the tank is about 7 inches below the prop hub. Also, my oil return line has no bends which place the oil line much higher than the top of the oil tank. This setup lets excessive amounts of oil left in the crankcase drain naturally to the tank after stopping the engine. (my personal theory). If the tank is too high, crankcase pressure has to force the oil uphill to the tank. If the tank is too low, the oil pump has to work harder to suck the oil up to the engine.
Bill.
That could explain why the system of burping can be hit and miss. I have a sting and I'm unsure what its height is to the Prop hub though I dont think the design would allow it any lower
If you look on the rotax owners website, go to page 76 of the installation manual.( part 13.6- Feasible position and location of the oil tank) It will show you exactly where the tank should be located in relation to the engine and explains why. I was fortunate that I had plenty of room to put the tank anywhere I pleased. In an enclosed cowling where space is limited, you sometimes just have to do the best you can to stay within the parameters. rotax recommends. Being higher or lower than rotax recommends does not mean the oil system will not work; it's just not an ideal setup.
I am new to the forum.
The important thing is not how many times you turn the prop but when you turn the prop and feel the compression on one of the cylinders, stop turning for a few seconds to allow the gasses to pass by the piston and push the oil into the oil tank. then you continue rotating until you feel the compression of the next cylinder and wait... and so on until il gurgles. normally around 8 turns for the whole proceedure.
But you do not have to stop turning. When you feel the compression rising--in response to the prop "pull," just slow down and pull slowly and steadily through the tension. If your oil is relatively clean and the air temps (don't check her hot) are not cold, she will "burp" shortly!
Now that I have gotten my Sting Sport trained, in this manner, she burps in 5-15 prop pulls.--RD
Is there any reason you cant spin it over with the starter with the mags off.
On start up with a oil chang.I usually do this until I see some oil pressure
on the gauge.
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