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Re: yard machine ym26ss straight shaft trimmer. New gas,
Fuel starvation - 'lean fuel' condition
Basic things to check: 1) spark plug 2) spark arrestor in muffler 3) fuel lines and tank filter 4) turn adjustment needles out (counterclockwise) 1/4 to 1/2 turn Chain Saws: 5) check impulse tube and intake boot for cracks or leaks
*if all of the above are OK and/or do not improve performance then: Remove Carburetor 6) replace gaskets/diaphragms a) use a spray carb cleaner to clean jets, holes, and body of carb b) fuel pump diaphragm goes against the carb body, then the gasket towards the outside c) metering gasket goes against the carb body, and the diaphragm goes towards the outside
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When this happens remove your muffler and check to see that the spark arrestor screen is not coked up with soot. If not remove the spark plug and with the ignition switch off pull the starter a few times. If some gas comes out of the cylinder then the carb is flooding the cylinder. In this case you have to open the carb and check the ' check valve' to see if it is seating properly or if the spring is weak. This can be done by pressing on the spring and releasing. Attach a piece of gas line to the intake and blow with your mouth. If air is escaping the valve and spring needs replacing. Another problem could be a faulty solenoid not delivering a consistent flow of electricity to the spark plug in sync with the rev of the piston.
Pull the spark plug and hold the side against the engine while pulling the string. check to see if there is a spark you may need another person to help. Was the air filter oily when you cleaned it? If so you might need to remove and clean the carburetor.
Are you saying full throttle, or full choke? if full throttle, you should be able to set the idle up. the idle screw will be the one when you give it gas, it will be the screw on you'r throttle linkage. If full choke, maybe the spark arrestor is plugged. You can remove it by removing the muffler.It would be between the muffler and cylinder head. You don't need this to run.I hope any thing I posted will help.
Maybe a quick fix and maybe not
check your muffler the factory puts a spark arrestor screen that tends to plug after awhile
there is a little plate on the side muffler that needs to be removed to access the screen you may need a torx bit or allen wrench to remove
you may have to remove the back half of the plastic cover to access the screws
remove screen and clean with carb. cleaner or equivalent make sure you can see through it and reverse the procedure to put it back