yeah, I have checked all that... cause those were my first suspicions... i have a new glowplug... the engine head is open... it cant overheat that easily could it? i just get speed and then take off and it bogs... cant be enough time to overheat... and I run it full throttle on the ground for over a minute... and it doesn't overheat... the prop cant be too big either, people run 16 props on there and also OS has this prop on recommendation list... so I am stomped... how should I tune it to know that I am rich enough? I did it how OS told me to in the manual... they said to be at full throttle and then lean slowly until RPMS pick up and once the RPM starts dropping it loses power cause its too lean then I need to richen it back to the setting where the RPM is constant and not dropping...