Not being smart, but looks like a rotor. To run tip top, both crankcase seals should probably be replaced. Be careful when taking these apart, there are many needle
bearings that will start falling out. You are best doing it over a baking pan or Frisbee.
I wonder if the engine has the rare rotary valve in it as opposed to the feather valve. It was also made by Octura, up's the HP and gives it a cool
"pap,pap,pap,pap,pap" sound out of the exhaust. I have the only one that I have ever heard of. It could be that some people just don't know, you almost have to pull
the intake apart to see.
What about that other piece? I have had literally hundreds, into the thousand of O&R parts in my hand and have never seen that one.
Not a bicycle application...
David, you are an Engine Master and correct on all counts. The McCullochs were used on drones that were shot down as
target practice. And yes, this is a gyrocopter. I took what the guy told me over the phone and mixed it up. Thanks for the correction!
I helped a guy with some carb parts to get his O&R running. It is used to start a McCulloch drone engine that were used for fighter jet target practice
back in the 70's. I had no idea that they existed.
Mr. Wallfish, the decals are actually very good quality. Look again at the direction of the 6300 rpm. Are you sure that it is in the opposite direction?!
Excellent explanations from David and John. both are very familiar with the older style carb. And John, you explained the parts thing to a tee. Hence the reason I liquidated most of my parts, although I don't mind keeping David stocked with anything that I have left! I have diaphragms and check valves and prefer cash in the mail for a lunch or six pack. No starter parts left.