Good day all, I have a Sachs 3.7 (so I'm told) and just want to clarify that it is a 3.7 or whatever. the cylinder has the following numbers on it (that i can see): 4ZZN5**W(5)?. Does this sound right? Would a conversion to electronic ignition be worth it? How about the weight savings by cleaning of the extra metal after converting?

That's one of the best...the number is 47ZN5...Makes a great conversion.. The flywheel and mag coil are very heavy..I am doing one here this week, I can weight it if you would like to know what the converted weight it....

Ralph, that would be great. This one as shown weighs 7 pounds! Is this indeed a 3.7? I have a few ARC planes (some actual ARC some in the bones from kits) I just bought (Ace Extra 230 87" is one) and would like to put it on one. I still have the 2 ignitions I bought from you a year or so ago. Just haven't had time to use them! Maybe this would be a good one to do?
Brian Tindall

I weighed the one here, it's less than 5lbs....Great engine....
The 47 is the bore size in MM, a 4.2 is a 49ZN....