I have changed all of the fuel lines to the 1/8 large size both externally and internally with a heavier clunker. I also secured the fuel lines to all barbs. The tank is Du-BRO 24oz centerlined to the carb, The tank is 7' from the tank fittings to the center of the carb.. I installed new 1/4 scale filter and fuel filler. I have tried the new Os plug #8 and the OS f plug. I was not able to start engine by hand with the plane in upright position however upon useing a starter the engine did run for a few seconds and then quit. The engine floods real easy if I prime it however it will not fire if I do not prime it and most of the time the proming floods the glow plug. I have opened the mixture control 2,3,4 turns with no noticable change in starting. The low end mixture has been tried at the even mark,1,2,3, clicks rich and 1,2,3 clicks lean. I am now down to the Exhaust manifold. I Think the J-Tec muffler is to small for this engine and is causing to much back pressure. I would order a new Bisson muffler but do not know which one to order. this is is the Sig 300XS 150 ARF, wing span 74-5/8, weight 12-13 lbs. The muffler that I have is the Bisson Model # 1180 for the Moki 180. With the configuration fo the 300 cowl, The muffler sits 1/4" too high and the pipes are forward instead of aft. I have studied the Bisson line of mufflers and still don't know what to order. I don't have to have a Bisson. I took the cowl off and instaslled the 180 Moki bissen muffler just to see if it would make a diff. No change. cannot get the engine to run for any period of time. Please advise. Any suggestions you might have. I am dpown to the installation of a cline regulater.
Ron.