Depending on what type of string head you have. If it's a "tap and go" style head, just rev it up full throttle and tap it on the ground. It should feed the string out and the blade on the shield will cut off the string to the correct length.
SOURCE: 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
I’m happy to assist further over the phone at https://www.6ya.com/expert/rolandw_c013176d62ee17ae
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