Hi Helijack

1% Castor - is that a typo? I would think it needs to be 10%. Total oil 22%.

Bob, don't mess with the carbs(OS). The Rossi runs very well as is and with the right pipe and fuel as Helijack says. This motor will idle for ages without quiting(any DF jock will know what I mean-motor quits just as you get to the end of the runway and ready for takeoff!). Remember that these poor DF motors are streched to the max and just need some patience in setting them up.

One strong motor.

Zane