While you wait for answers, we may have found some information which could help you.
Click here for Run Mcculloch Mt270how to change mcculloch sl trim head?
Fuel Starvation?
How can I replace electric cord on mcculloch air stream electric blower?
McCulloch MT270X ignition coil?
Mcculloch 2818 Runs fine but spool will not spin?
2 Stroke strimmer not running?