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Is this a consistent situation? Starts, runs then dies after a little while?
If so, sounds like carburetor/fuel pump (which is a one way diagraphm) issue.
Take carburetor apart, and also obtain a rebuild kit for it. Clean it well, compressed air through all the jets, replace the parts from the kit and reassemble. Re-install back onto unit.
Also... Replace Spark Plug, fuel filter and clean the spark Arrestor screen at muffler.
The machine is completly flooded, remove the spark plug, switch the ignition off, crank the engine until there is no further fuel spraying from the plug hole, leave for a few hours to dry out, replace a dry plug and try again with no choke and full throttle.
the l is for idle and the h is for top end but thats not ur problem it sounds like ur carb is clogged there is a screen inside of the carb the fuel gets crystalized and blocks off some and sometimes all of the fuel ill bet thats the problembut u can try the adjustments first give the unit full throttle and turn the h adjustment screw in and or out till it sounds great and at full power if that dont work then do the screen in the carb
Mcculloch MB3202 anti-vibration back pack leaf blower, runs better at the middle setting of the choke than it does if it's wide open the way it should be. Can't get it to blow leaves well. Owners manual lost. ANY ADVICE???????? New gas, spark plug starts on the first pull but just doesn't give out like it should.