Hi, I am in the process of dismantling an early OSFS 60 ( open rocker type) as it needs new bearings and have ground to a halt. I can't see how to get at the bearing under the rear gear where the valve lifters live. It looks like I will have to remove the OS60 badge but it's not obvious to me how to do this. I notice that there are two small cutouts on the badge. Do I put a small scredriver in one of these and twist it off? I don't want to ruin anything so thought I would ask first. I would appreciate any advice here.

Boz:

Pictures are a little newer engine with a complete rocker box, but still close.

The rear cover just pries off - an o-ring snaps in a groove to hold it.

When the cover is off you will see a slotted head screw that holds the camshaft in the bearing. Be advised, this screw is a LEFT hand thread. If you break it you'll probably never get a replacement, be careful.

Bill.

Bill, many thanks for that. I'm going to need another crankcase anyway as I noticed some internal damage.

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.