just rebuilt the carbs again and it runs a little better but still doesent want to go on the bottom end with the chock in after its warmed up i have 280 mains 25 pilots and needles on 4th clip with air screws 1.75 out it works a little better now but still stumbles on the bottom it will idle but then dies when trying to touch the throttle. i have the fuel mixed at 32:1but the silencers slacked off and there is a far bit of black on the silencers i tightened them up and tried again. but do u think i need to bump the pilots up and change plugs and lean it out a bit? thanks