Butch(OH)
Addicted to ArboristSite
OK carburetor men, care to help out a novice? I just completely rebuilt a 110 Dolmar that had lean siezed. New crank bearings and seals, cylinder and piston kit, and gasket kit for the Tillotson HK-21A. I have rebult a few carbs meaning blowing them out, gaskets, setting the needle height to spec, diaphrams etc but realy dont know ding how the things actualy do what they do. Not having a manual with initial settings I set both needles at 1 turn off the seat. The saw started very easily and the idle needed to be leaned justa tad and the high speed opened up. Id guess they are set at 3/4 out for the idle and 1 1/4 our for the high speed at this moment. You can start the saw and it ides perfectly, crack the throttle and it accelerates smoothly and comes right back to idle now here is the hitch. Put it in a cut (where it has great power) coming out of the cut it four strokes a bit but when you let off, one time the idle will be a smooth sounding higher RPM idle and when you try the throttle it hessitates, leaned out right?. A few seconds later the thing will idle normaly. Put it back in the cut and it has power like it should, four strokes a bit coming out of the cut but then trys to die. Playing with the throttle will keep it running but it is four stroking and smoking blue, Rich right? Will return to normal acting idle after playing with it maybe 15 seconds. Never know which way it will be coming out of a cut, rich or lean. Cleaned the vent and even took it out and ran the hose out the side just to try it, no differance. Installed a clear line to the carb and no bubbles. Filter is new, fuel is fresh. Squirted carb cleaner around all the intake gaskets and idle does not change. I am stumped.