I have an older OS .40 engine that we're trying to identify. It says OS MAX - H on the side (but it does not look like a heli engine). It has front and rear bearings and a 4A carb.

My hobby shop called Great Planes today and they no longer have a listing for it. Problem is, I need a needle valve for it but we're unable to match one up. Anyone have any ideas?

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another option might be to get a different carb for it, Just measure the part that goes in and find one to match on a engine of the same size.

Dauntae

The H is just the OS model number and doesn't mean Helicopter. Are you sure it has a ball race at the front? If so then it should have either P or R (could be RR, I'm not sure now) underneath the 40.

It might be 13mm....if it is, this carb off the Magnum
.40, and .46 will work. And only $14.95....complete.

Dave.