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Re: craftsman leaf blower
Check the fuel lines,fuel filter and clean the fuel tank.Disassembly the carb and clean it carefully.Diafragm type carb has a fuelpump,pay attention to it ,has to be tighten not folded.When the engine gets warm ,the fuelpump cannot keep the right proportion of fuel and the air/fuel mixture is changing.It has to be changed.
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All carburetors have 3 screws high and low and idle, then screw high and low all the way in, then turn them back 1 and half that should be factory settings go from there. start with the high idle back it out slow until it sounds good. My blower ran good on two turns out on high idle then three turns on low idle. Good luck...
check age of gas. Cannot be more than 30 days old.
Make sure to use fresh gas w/synthetic 2-cycle oil @ 40:1 ratio
(1 gal.) Gas to 3.2 oz. Oil). Do not use old or stale oil/gas mixture. Always
use the proper oil/gas mix. If you do not, your engine will suffer rapid,
permanent damage.May need to clean or replace carburetor.
The Idle screw should just touch the throttle lever to start, the low speed should be set at 1 to 1.5 turns out from lightly seated, and the high speed should be set the same. Final adjustments are made only after it has been warmed up. If you adjust before 2 minutes of use the mixture will be too rich.
Have you Removed the Muffler and Checked the Exhaust Port and Muffler for Carbin Restriction?
Remove the Muffler and Start the Unit. If the Operates Correctly, then the Spark Arrestor Screen is Clogged and the Muffler/Screen Requires Replacing.
Make Sure the Exhaust Port is Not Restricted Also.
Hope this Helps.