Boz:

A new crankcase for that old bear? Lotsa luck, Charlie.

The old "Rear cam" OS engines ran well, really thumpers. But power was something they never had, specially compared even to the early Saitos. and the old Saitos will still match the current OS offerings. The new Saitos put OS to shame, both from a weight standpoint as well as power.

In other words, if you want to run it on display at a MECA Collecto, fine. If you want to build an "Antique" model, fine. If you want it for daily flying, there are many other engines much better suited.

The engine pictured above was in perfect condition, I traded it for a damaged Saito, and I still think I got the better of the deal. The Saito flies. The old OS did try, I have to give it that much.

Bill.