Stihl MS250 saw engine started up and runs. Checked 155 psi compression. Looking at the saw it had very little use before it got it's arms and legs all broke up. SOme one must have been really kicking himself for that one. The way it feels when pulling it over it has had very little run time. And the exhaust port was almost like new. Specs say it is 45 cc. Not sure yet if I will look for a donor saw to rebuild it or sell the engine.

Does any one have any info or experience with this engine?
Thanks

Good morning
I have an engine from this chainsaw, I have take a short block, and have bought new piston , rings, and ball bearings that support crankshaft.
Comparison with my Homelite 38 cc, the Homelite needle bearings is like a toy.
German quality , two rings, big needle bearings on rod, excelent quality, properly cared last for your grandson.
I am not converted it yet, but have muuuuch better quality than homelite.
It is in the same level of quality of best japanese chainsaw, I know I have two Echos.
For use in chainsaw, very good.
For use like conversion engine for airplanes, nice.
Very small quantity Stihl chainsaws converted in this forum because this engine is very expensive.
Happy landings
Jose

I pulled the engine after running it some and doing a compression test. 170psi after having run it! Yes it pulled hard. That's one reason I believe it has barely been ran. The inside looks as close to new as you can get on an engine that has been run. So now I have to decide weather to convert it or let it go. What would be the propeller side of the crank is short. But that should provide good rigidty I would think. All ready has a pulse hook up for the carb. It weighed in at 2lbs. 10oz. just the way it is pictured with the spark plug. To mount it would need some brackets like the Poulan 42. It uses a boot type carb hook up like a Poulan 46. But this has a small lip around it. I was thinking of an adapter that would fit over it and then an oring for support and sealing next to the engine. Then have 3 spaced set screws around it that would be next to the lip to secure it.

Any updates?