ORIGINAL: brooke
Thanks for the info. I am running a MAS 11x6 prop on it now. Also Rc Ken you say to run it at top speed and then back it down. Do you mean top speed being top of the rpm range? I understood the rpm range as the max rpm being the lean side and the lower the rpm setting the richer it would be. It sounds like I am wrong, so can anyone tell me what the rpm range is for or what setting the rpm with a tac is good for?
You are right, high RPM=lean, low RPM=rich. When you read the OS Manuals they say that to find the optimum needle-valve setting, to close the vavle until you hit peak RPM, and then open it slightly from there. I don't have my manual here, so I can't recall how far. Most folks on here seem to bring the engine to peak RPM (which is lean) and then drop it by about 300rpm opr so. What Ken said with the 4 clicks open on the needle valve should accomplish that. And like he said, if it smokes, your ok.