problems with mcclloch pro mac 700?

yo ash, me agen.
try using some 'nos' octane booster, you get it in halfords and suchlike. this stuff has a marked increase on an engine's performance. you might to want to try adjusting the idle jet and pilot jet on the carb, and do some research into the principle of a CHOKE, are you familiar with the concept of a choke? the idle jet controls the fuel/air mixture at idle, and when the choke is shut, (and throttle open) the fuel for starting the engine comes in here. so that may well be your problem, buddy.

steve
May 2005