25cc trimmer only works on full choke. At half choke or run positions the motor dies. It was recommended to me that I remove the 'spark arrestor' that is situated next to the muffler. I opened the machine took the muffler off, but what does a 'spark arrestor' look like?
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Re: trimmer only works on full choke
Check the fuel lines for cracks/breaks. If they are o.k., then:
will need to disassemble the carburetor and spray
with carb.cleaner. Make sure the small screen is free of debris.
(Should be able to see daylight through it.) Use a Den Tek Brush, (http://www.drugstore.com/products/prod.asp?pid=165357&catid=1152),
to clean the small portals in carb. These portals can
become blocked. Reassemble and start.
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It sounds like the spark arrestor screen in the muffler is clogged with carbon. You may have to look at the muffler to find where the spark arrestor screen is. It is in a different place on each brand of trimmer. You can clean the spark arrestor screen after it is out or off of the muffler by burning it with a propane or similar torch. This will cause the carbon to get hot enough to ash off of the screen. Then you can put it back in the carburetor.
Fuel mix is too heavy on oil, or if you run the trimmer at half throttle a lot this can cause the carbon buildup. I hope this answers your question.
It should probably be behind a small cover at the back of the machine. The running issue is carb related any you may be due for a rebuild or decarbonization of the spark arrestor/muffler and/ or engine exhaust port.
The gas is going into the the crankcase. When the piston goes down it opens the ports and allows the gas to go down untill it could fill the crankcase. Start by blowing compressed air into the spark plug hole and allowing the piston to go to it's lowest position. This will usually remove any liquid gas from the crankcase. Next get yourself a small spray bottle and fill it with the same gas mixture your trimmer uses. Now you can spray a small amount into the spark plug port, replace the spark plug, full choke and pull till it pops. set to half choke and pull. I have also sprayed into the carb but you must open the throttle to allow the gas to enter the combustion chamber. Spray,close throttle,pull choke and pull. You may need to do this a few times for it to start. After it starts let it run at half choke for awhile until it warms a bit then open choke and go to full throttle. If this dosen't work it's possible to have other problems.
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.