I am a 4 stroke virgin though so I have some questions..... on this motor the crankcase breather exits by the camshaft through a tube to the intake, there is no snubber to restrict the flow or any sort of one way valve, what happens at WOT with this tube? with the piston going up and down 8000 times a minute that's an awful lot of crankcase air pushing back and forwards through this tube! could it affect the mixture? in a closed throttle situation I gues with the vacuum the intake forms it will suck out all the excess oil but once again the piston pulsed may play havoc with the mix? I can see the advantage to this with no oil dripping out of a tube under the plane.....