Hi,

I have got the engine back to almost peak rpm. Here's what were done:

Removed the 18" extension - idle to mid was smoother, but still stalling at full throttle (7000 at 3/4, 5000 at full throttle).
Removed the wire-mesh fuel clunk/filter and change fuel lines - no effect.
Changed from 14x8 to 14x6 prop - slightly increased rpm at full throttle but still stalled at full throttle
Opened idle and high end needle and readjusted - not much effect.
Then, change to a small 12x8 prop, engine raced to 11,000 rpm.
Change back to 12x6 prop - engine reached 8500 rpm at full throttle after some adjusting to the high end!
(Peak rpm in the manual for this prop is 8,800)

This running at 11,000rpm - did it un-stuck something inside the engine or the carb....? The engine was initially run about 6 year ago on the stand, then left on the shelf until now.

Chris