While you wait for answers, we may have found some information which could help you.
Click here for Line Mcculloch 2502 Stroke strimmer not running?
How do i keep my strimmer running?
How can I replace electric cord on mcculloch air stream electric blower?
Fuel Starvation?
Mcculloch 2818 Runs fine but spool will not spin?
Where can I buy a strimmer spool spring for my McCulloch MT270X strimmer?