Ok a i am going to add my two cents.
(Im a little......, so moving on)
What i have noticed is that there are many makes of these egines. Many of which look similar and use like parts.
There is not enough, or endless searching the for the information needed to solve any problem.
Basically i have come up with the fundamental differences between engines is that piston arm length, position of wristpin on piston, and jugs is the major difference in these egines. Different combinations can work but not as well as the intended version made for that particular "engine".
So please take a moment and size things up, you'll find that it may look alike but just won't work.
In any case buying all those parts will make you understand what's going on with these engines and make a better mechanic and problem solver out of you.
Love,
, and there's a stain on your pants, grease.
Out