Question about Chainsaws
Runs just fine @ idle, but when tries to accelerate, unit bogs down & dies.
I have replaced all fuel lines, fuel filter, & removed carb & soaked overnight in carb-cleaner & installed a overhaul kit. Removed & cleaned exhaust & spark arrestor screen. However, unit still does the same thing as before.
Do you have the H and L adjuster screws on the carb? If so, then normally I'd back out a little bit on the L (low speed side of carb) The instructions for adjusting carbs, years ago, on 2-stroke, say to back out on the L when motor will not rapidly rev up. Most 2-stroke carbs have these 2-jets. The L is for gas to pass to motor with butterfly throttle plate closed. When opening throttle plate, there is a sudden rush of air, at first, and this L adjustment is allowing enough gas to pass for motor to begin to rev. up. Then the gas will also flow through another small port H, usually a small brass tube in the venture area (smallest diameter section of carb). You adjust the H with the throttle wide open, motor revved up. Turn either in or out slightly till highest RPMS reached, motor smooth and fast, then turn H out about 1/4 turn. The idea is to run motor slightly rich for highest HP when under load (cutting). Hope this helps
Posted on Nov 19, 2008
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