thnaks for your answer.

When you say, easy to drive, is because the botton end the B6 is lower that the B5???

i like a engine with botton end (60%) en Top end (40%), a engine with torque for the jumps.

I have a Losi 8ight 2.0, with a toro nero.

About the pipe, i dont have problem with the fuel comsuption, i like the engine run well, later see the fuel comsuption.

you have the link about B6 engine??