I bought this engine NOOB (New Out of Box) from a fellow about a year ago, but cannot locate the paperwork. I think it was an "F" or "SF", but cannot remember.
It needs a muffler. I have e-m'ed Tower and Macs but have yet to hear anything.
If someone could help me identify it, life would be much easier.
It is here:
http://home.internetcds.com/~barbados/os61%20copy.jpg
It is apx. 33.85mm center-to-center for the muffler mounting holes.
The exhaust opening in the engine is apx. 21.45mm long and 8.8mm high.
The only other marking on the engine is the number " 6707" on the back housing, OS MAX on the left and "61" on the muffler side. It appears to be a ringed engine.
Any help would be greatly appreciated.