While you wait for answers, we may have found some information which could help you.
Click here for Model Throttle Cable2 Stroke strimmer not running?
mcculoch petrol strimmer sparkplug ?
how can i fix mcculloch mt270 strimmer?
Mcculloch 2818 Runs fine but spool will not spin?
How can I replace electric cord on mcculloch air stream electric blower?
Fuel Starvation?