I am haveing trouble getting this engine to run at full throttle. It runs great for the first 3/4 stick but then it either boggs down and or cuts out completly. I just tryed adjusting the needles for the last hour and can get the engine to run at wide open throttle. I also just replumbed the tank and got it back from service about a month ago.

Any help would be great.

Thanks

Chad

I just resolved a similar problem with my 3w 100. It turned out that the carburetor was clogged at the screen inside the carb. Just inside the carb, under where the fuel inlet goes, there is a small screen to filter out any debris in the gasoline. I had not cleaned mine out in a year or so. I do not run any filter in the line between the tank and carb. The symptoms are very similar to yours. The engine was too lean at full throttle and would quit. I opened the high speed needle valve and the engine would not richen up. So when I got home, I cleaned this screen. Next time at the field, I had to close the HS NV back to where it was because it was now blubbery rich.

First look for fuel delivery problems, supply line, tank, filter, VENT LINE, etc. Once your sure that ENOUGH fuel is getting to the engine, then it is time for tuning with patients. Set the needles to factory specs. Tune the LOW END FIRST! All your looking for is a smooth transition, don't try to fine tune it yet. Then get after the HIGH END with a good TACH. Peek the rpm then back off about 200 rpm buy making it richer. Fly the plane and make sure it continues to run through maneuvers. Then go back and tweak the low end again. A 1/6" turn will make a difference. I personally don't look for every rpm that I can get. As long as it runs good I leave it alone. If all else fails check the reed because they do wear out.