Also....SIRIO 15.....1.7HP, they said it is an off-road engine but they tested it on 200mm TC and have great result..........they best part is......only $150.....and will fit NTC3 without any mod (probably just a little cutting on the standard crank)
I will drop a slide carb from Nova Rossi and into the R40 just to see how fast it will go...........that engine has really high torque and I think I will use the highest gear for the R40 to MAX the engine.
Just cannot justified $250 plus for the RB and Nova Rossi 15 when all of them are illegal.