Hey guys. First sorry if i'm posting in the wrong spot i'm new to the site.

Secondly I need help with my new O.S. motor, it's a 21xz-b and I have been having troubles ever since I purchased it... The motor is near impossible to break in, I am lucky to get it to idle let alone hold a rev at half throttle for break in. I keep messing around with the needles as I have basic knowledge of how to adjust them but I am worried that I will damage something if I keep up what I am doing.

Does anyone else have or has had the same problem, and could give me some tips as to what to do to get it running, as i said I am still in the break in stage... This is my last resort before i take it back to the hobby shop I purchased the engine from and pay even more money for them to get it running..

Thank for the help in advance!