So here is my modified 45.4cc stihl ms250 025 with the old style one piece crank from a stihl 021 that is alot lighter at only 14 oz. the stock one is 20 oz. I weighed the pistons and they were the same weight so I dont think vibration will be an issue , I hope I have not completed the prop shaft or the carb adapter , the total weight is only 38 oz. so far. The lightest motor I have found in this size is the evolution 45 at 45.5 oz. If I can keep the prop adapter and carb mount to 3.5 oz. I will be a 1/4 pound lighter than the lightest motor available on the market today.

Darin

bn120: What ignition system are you going to use? Looks good so far. Capt,n

Why ch of course

Well it came out a little heavier than I wanted 42oz but still under the evolution 45. Now I just need new bearings so I can fire it up and see what I have here.

Darin

You might want to replace part of the aluminum carb adapter with some epoxy board ir phenolic for heat insulation..It doesn't take much heat to vapor lock the carb and drive you nuts trying to figure out why it ran so good when first run, then started acting up...

Ralph do you have one that can just bolt on.

Darin

No, I have a large piece of G10 epoxy board that gets cut up when needed...If you run it like it is and have no problem, don't worry about it..If not I can send you a small piece for a few $..