My Mac cat 330 does the same thing, runs until full throttle is on. The pull cord also keeps slipping and doesn't retract properly, seems to shut off after it slips in slightly. The spring is fine, i'm lost with it!
Lyndz
May 2010
My chainsaw is difficult to start, will run for short while then cut out and will not restart. Have been informed it is beyond repair
Ted Wallis
August 2009
I can answer this question...
Can I get a manual on line for a McCoulloch chain saw? I want to fix mine?
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix chainsaws.