Hi George, I have 7 or 8 SS 2.47s, two are Jin Shi versions. The Jin Shis have a larger crank with a larger transfer port.
One of them is in a Dumas Tomahawk, and it's special because I taught James Zchou to fly control line with it.
James had about 45min. training with a Mackey's control line stunt kite first. That Dumas Tomahawk is over 25 years
old and had been powered originally with a LLLAM 2.49cc diesel, then three different SS 2.47cc diesels before installing
the Jin Shi. I fly it on 60'x.015" lines and use a 9X4 Taipan. Both Jin Shi's turn a Taipan 8X4 14,600-14,800 rpm. Mr
Gau told me the SS 1.49s were based on the middle 1950s Webra 1.49 engines. I've got one SS 1.49 but it doesn't
have much time on it, it didn't want to rev up without vibrating. Mine has an incredibly heavy unbalanced piston etc....

Tony G