Additional info on the TRIMSALL engine that I failed to mention. The RPM on this egine was achieved after the flywheel was trimmed and the larger carb was installed. This is one of those engines that appears out of balance without the flywheel, and it has a solid connecting rod. The conection rod looks much like the ones found in chainsaw engines that have mains on both sides. The bottom of the cylinder is not tapered at present, but will be after I tear it down again. It has one wide ring, and very good compression. I plan on installing a FRANK BOWMAN ring at some point. The prop I used is a 18X6 APC narrow blade. The engine has very little wear on it, and the reason it was discarded was the fact that the recoil assembly was totally destroyed and in pieces. "FLATHEAD"