hello everyone im new to the forum and in desperate need of some help! I have a husqvarna 272xp that wont fire. the magneto went bad and i took one out of a 51 and she ran great. i probably didnt even get 20 minutes of work out of it before i lost fire again! ive changed the plug and still cannot get fire. any ideas on whats killing my magnetos? also i have a craftsman saw made by poulan that will start easy and will have good power for a minute then it loses power and will jump back and forth from power to no power sometimes you have to milk the throttle just to keep it running. any help is greatly appreciated, thanks guys!