Troy, I just realized my real name is nowhere on the post, this is Bob Kane. Here is my brief history of this motor:

- Purchased from MA, fellow FAI pilot at Muncie. He said the motor had not been run since return from YS service.
- I installed it in the plane and ran it briefly Friday night. It ran ok, but there was a little fuel residue in the valve cover.
- Saturday morning, you suggested I change out the dark blue tubing on the motor with fresh fuel tubing. I did, and assumed that must
have been the source of the leak.
- The motor quit after 3 or 4 manuvers in my first round. When I got the plane back to the pits, the top of the motor was wet. I pulled the valve cover and found the gasket was cut. I put in a new gasket and assumed the problem was fixed.
- Motor ran ok for round 2
- Motor quit again a couple of manuvers into round 3. I did not die suddenly, it kind of coasted to a stop, always after low throttle
setting.
- I missed round 4, I could not get it tuned correctly.
- JH worked on the motor, and found the intake valve setting to be too tight, so the assumption was it was heating up during flight and
causing a loss of compression, consistant with the way it was quitting.
- JH also replaced the regulator diaphram with the newest version.I installed a new OS F plug.
- Reset the regulator to flush and needle out 1-3/4 turns, the thing ran great. Nice linear throttle, good power.
- Motor ran great for rounds 5 and 6

Which brings us to yesterday.

I am going to replace the pump body and upper pushrod to see if they are the source of the leak. I'll post the results.