Compression check on Rotax 912 ?

[markscogg]

How do you check the compression on a Rotax 912?
Differential check just like a lycoming or continental?
Or PSI check like a car?
I have heard both.
Thanks

[Tracer 10]

I used a differential compression tester; the same as used on the Lycoming/Continental Engines.
Just be darn careful that you have the piston on top dead center of the compression stroke and a qualified/experienced person holding the prop; before applying air pressure to the cylinder being tested.
I also highly recommend balancing the carburetors with a manometer; you won't believe the difference in how well that engine can run with balanced carb's. As far as i am concerned--the Rotax engine is a well proven and excellent engine.