I have an MS440 saw that runs great in winter, but will not idle or start correctly in the summer. After it does run for a while and gets hot it will not run period. It does fire if you hold it wide open, but then dies. I have taken it to the dealer. He adjusted the carb, and said he couldn't see any problems. I called another dealer and he said it sounded like the cylinder walls are scored and building pressure up in carb during warm season operation. I took a look at the cylinder. There is some scoring, but not sure how bad it is. So What Do you guys think? I've pretty much had it with this saw!! It's heading for the trash if I can't figure something out soon!
Thanks for any help! Brett Day