Polio66
New Member
I replaced the piston and cylinder head in a 028 AV wood boss with a used 44 mm piston from 028 wood boss. The saw starts, idles well, runs at high rpm without load, BUT loses power (bogs down?) then stalls under load (about half way through a 12" log).
Here is what I checked:
*tank vent is not plugged
*carburetor rebuilt: new diaphragms, new needle valve, ports cleaned with compressed air
*cylinder head screws are tight
*fuel filter not plugged up
*intake manifold screwed tightly to cylinder head, no visible cracks in manifold
*fuel line though cracked on outside seems to hold pressure
I noticed the inside of the muffler was oily, and I thought I may be running rich. I screwed the H screw leaner (clockwise) (just less then 1 turn out from closed). The saw bogged down under load, just the same.
Thought maybe the pulse tube (manifold to fuel pump) has a leak, but even if I did wouldn't the saw run lean, not rich???
Any ideas ?????
Here is what I checked:
*tank vent is not plugged
*carburetor rebuilt: new diaphragms, new needle valve, ports cleaned with compressed air
*cylinder head screws are tight
*fuel filter not plugged up
*intake manifold screwed tightly to cylinder head, no visible cracks in manifold
*fuel line though cracked on outside seems to hold pressure
I noticed the inside of the muffler was oily, and I thought I may be running rich. I screwed the H screw leaner (clockwise) (just less then 1 turn out from closed). The saw bogged down under load, just the same.
Thought maybe the pulse tube (manifold to fuel pump) has a leak, but even if I did wouldn't the saw run lean, not rich???
Any ideas ?????