Stihl MS 290 Engine Failure

[grizz55chev]

As requested, along with the clutch side crank seal that is starting to show its spring:
View attachment 757307 Rings on this exhaust side seem to be in good shape -- a far cry from the input side as shown in Post #1. The circlip flipped a coin and then said, "I want to mess up the input side first." Then he jumped off the piston pin and went to work doing exactly that. He succeeded.

We still don’t know if it’s OEM or not.

 

[lone wolf]

We still don’t know if it’s OEM or not.

Yes is it Doc?

 

[Wood Doctor]

Yes is it Doc?

I don't know. The guy who gave me the saw to rebuild bought it used and he doesn't know either. The worn crank seal looks like other OEM seals I have seen. This saw looks to be 11 years old. There could have been a half dozen owners. That's all part of the restoration challenge we face.