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Make sure fuel is mixed correctly, make sure the choke isnt stuck on aswel, ive had it happen to me before when the little blue leaver sticks and it wont rev out properly.
Before one starts adjusting the carburettor's settings:
Bear in mind that small gasoline powered engines need to run at reasonably high idle revs - just to keep running. Unlike a motor vehicles' engine, where weight (and size) is no real problem, these small engines have no flywheel to store inertial energy and keep the engine running.
Adjusting the revs below a certain point results in the engine dying when the throttle is closed, and all the hassles of trying to restart them.
I seriously suggest maintaining the default settings.
Start with about 1 1/2 turns. Then, when you get the motor started, hold the throttle to full and adjust the screw until the motor revs up and evens out. Likewise for the low speed. If you give it the gas and it dies or stutters, turn the other screw slightly 'til it revs up without hesitation.
Check Your exhaust port.. not the muffler itself the actual port. More than likely carbon and Soot has built up clogging the port significantly. It commonly does this after a few to three years of use. Usually caused by to much two cycle oil added to the gas and just carbons debris building up from combustion.
Hope this helps because it sure helped me ????????????
assuming weedeater brand weed eater, the carb. has a filter screen, that blocks and does not allow the pump to push sufficient fuel. A phillips head screw on the side of the carburettor secures a square plate, remove the screw and plate and gently brush the screen clean, dirt collects on the visible side.
Dirty foam filters if fitted change the fuel mixture and make it too rich to run.
and the fuel mixture knob, although secured by a tension spring, moves and may need to be readjusted
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