RE: OS Max 91fx Shutting off above 3/4 throttle, HELP!
To clarify, what JB is calling the midrange needle is the same thing you are calling the low speed needle.
One question that hasn't been asked is whether or not the new engine had been run by the previous owner before you got it? If so, has anything at all been changed aside from what it's mounted on (ie, did you change the needle settings at all before starting it the first time)? It's possible that your old engine had a problem, but this new one does too. It's not unheard of for RC'ers to sell off their problem equipment instead of fixing it themselves.