hi
this is my first post on here and im kind of new to the sport, i started flying this year and have progressed quite quickly from beginers planes though intermediate aileron and i've now just bought a second hand ripmax extreme lite, this is my first nitro plane, i havent flown yet but i have got everything together and taxied it around, the only issue i have at the moment is with the os .40la engine, it starts and runs fine but as i go above about 60% throttle it develops flat spots then starts to die off, if i reduce throttle it then picks up again! as this is my first glow engine i have no experience in tuning etc and as i have no flying clubs in my area i though i would ask here and see if you kind people could point me in the right direction!

cheers, chris