Hi Bob.
I got my new Jett 46 a few days ago and ran it in. When I changed to the 10/6 prop from the 9/6 as the dirrections told to do, the motor revs high and low.( 12,000 to 15,000) Rpm. I changed to an OS # 8 and the motor runs better,but the rpm is around 14,000 Rpm. (10% fuel)
I was wondering what plug came with the motor since it isn"t marked at all.

When I mounted the 46 on the plane the muffler hit the wing so I had to order an extension for the muffler. Jett said that I would loose a few RPM by using this extension.(3/4"). Can you tell me what RPM I should see when the extension comes in and I get to run it up.
So far this is the best performing 46 that I have ever had and I've been flying RC since 1958.
Thanks