I've never started a thread on here before but I've noticed that on several of my ringed engines, the amount of compression they have feels different if the engine is turned counter clockwise compared to turning the prop clockwise? I have my own idea's as to the cause but I would like to hear some other thoughts on this?

I have three identical Custom Lee K&B 61's two of them have better compression if turned counter clockwise and the other is just the opposite. All three run fine.

I have a Magnum 120 4 stroke that has excellent compression if turned counter clockwise, but almost none if turned clockwise. These engines are all relatively new. I also have two Magnum 61 four strokes and they are both the same either way.

For you real guru's, I have some ST 40, 51, 61, & 91 engines that are the same either way. This should tell you why?