Guys, I've got my first gasser, a GP Aeromaster with the Fugi 43cc. The engine is new and I'm using 25:1 mix per instructions. I've run 60 oz of fuel through it and with a 20 X 8 wood prop the best I get is 6150 rpm. Idle is running 1850 and I have resonable transition from low to high and high to low. I'm flying in the Denver area at 5200'. Is this kind of high rpm normal for this altitude? I have not messed with the needle settings from the factory. I flew the plane and it was barely able to fly, I asked GP about this issue and they suggested a 20 X 12 prop but I still think I should be getting another 1000+ rpm's out of this motor. Many thanks, Jerry.