Feeling some responsbility to clarify the woodruff key happening for many forum watchers, specially to Mr. Matt K.
Replacing a key borrowed from my friend revived my engine running 7300 RPM (18X10 Hawk wooden prop, gas/motul 800 (33:1) with Stock muffler) with slight rich condition on the same test bed. This OS GT33 engine is mounted on a Hyde mount (the first original Hyde mount for OS GT33, I think, and generous express shipping from Merle) with Hatori Muffler and Header in F3A Smaragd. Just final touch needed for maiden flight. In late evening just after setting the power plant and organizing lines, a test running suprized us, the my friend builder and me with easy starting and tremendous power. The same engine setting with Hatori canister muffler and header turned the same prop around 7700 RPM. At idle 1850 RPM, the engine has a little vibration on the Hyde mount, but normal RPM 2500-7700 just like a glow engine, no vibration. My power plant, OS GT33, Hyde mount and Hatori Canister and header looks a good commbination. Soft sound, no vibration like a glow engine, linear throttle response and tremendous power. In late evening did not try to set the optimum engine setting. Waiting a good weather for maiden flight in this weekend. Sorry for my happening on wodruff key of OS GT33 by mismounting a prop. Before final touch for beauty, posting severl photos.
Regards