While you wait for answers, we may have found some information which could help you.
Click here for Adjustment Screws Carbhow to change mcculloch sl trim head?
McCulloch MT270X ignition coil?
How do i keep my strimmer running?
how can i fix mcculloch mt270 strimmer?
Fuel Starvation?
Mcculloch 2818 Runs fine but spool will not spin?