I recently installed a new OS .37 in my Raptor 30, the break in and test flights went fine with no overheating. The other day I passes the TX to my son to get the feel of the new set up when all of a sudden the engine started bogging and stopped about 2 feet off the ground. Like a dummy I started trying to tweek the needles and of course that is not the problem, it does seem it idle and start OK. Tonight I tried a fresh jug of fuel with no improvements so I removed the fuel tank to check the pick up line, main line, filter and dissassembled the carb to check for blockage, no problems were found. I checked the OS #8 plug, it is very clean with a bright coil, I have not changes it yet. I have another problem, I cant find my box with instruction book to get my needles back to baseline, I think I left it on the bumber of my truck...DANG IT! If I get my needles back to factory settings, change the plug and it doesn't help, what can I try next? It got dark on mt tonight so I had to stop.

Thank you for your time!
David