Appreciate your replies and thoughts.

I guess one think that puzzles me and seems to be contrary to the compression source, is that between my two engines, moki 1.8 and ys 1.4. Is that when flipping the props by hand it appears that the moki has much more compression than the ys1.4. Not to mention the compression on the moki 2.1 which took a finger nail off of one of my fingers, ouch! But the moki 2.1 will seems to rev right up when pointed down.

Could it be that when travelling on a downline the two stroke prop only needs to spin one revolution before it hits compression and fires vs. the four stroke has to spin two turns?

I know this may not be a big issue but it kind of drives me nuts because I'm not sure of the answer. Not to mention I'd like to slow my moki's down a bit when pointed down.

Take care.

Mike