Piper ... come on ... there are so many instances of ST engines giving crappy transition, heck ... even Bax will be able to attest to that. He will tell you to rotate the spray bar. He says the engine is best when running at 12,000 RPM, of course, with light loading. Come on I was running my TT61 on a 12x8 and the transition was nice. I run an ST G90 on 12x8/13x6/14x6 ... its all the same ... lousy transition. Other than that the engine is nice but unfortunately not consistent. My friend's new G90 will 'pop' like an ABC when you turn it by hand! Mine is like there is almost no compression.

If you want a non screaming engine, go for the ST, they are cheap and good. Easy to start etc but just be patient with the tuning. Just get a TT61Pro, its easy to run.