Originally posted by no4hitter
Excellent engine, same as the novarossi rs .12, mod this engine and you have something special. Agree with above, tuning after mod is easy. you'll love it
You are correct in that this is an excellent engine, but it is not identical to the RS12.
The TT12 S1 is closer related to the Mugen MT12, they are both long rod (not long stroke) egines.