Hi all

I am a recent arrival to the fixed wing scene after flying helis for a few years. I purchased a polecat with a .40 OS engine and I have a vibration issue. It seems that there is a bit of movement in the crankshaft (i.e., you can move the crankshaft in and out slightly). Adding a washer does not seem to help as there is a lip on the crank which prevents the washer from actually tigthning up against the engine. Is this slack normal and could it cause virbation?

Thanks