What is about chainsaws and them being hard to start.......

Anyway...I have a trusty Husqvarna 45 Special that has served me well to date, however at my last outing I may have got the fuel/oil mix a bit lean and each time she ran out of fuel, she was hard to start on refueling(usually was a good starter)till after about the third refueling she failed to start at all and lumberjacking was abandoned for the day.

Took the saw home and completley stripped down and thouroughly cleaned every componant. Only thing of note was some slight scoring of cylinder and piston in the area of the exhaust port. Fully reassembled and fueled her up. Still unable to start her. There is compression, there is a spark, and there appears to be fuel getting into the cylinder. But do you think she'd start, No siree!! There is just a hint of a cough of possible start then nothing.

There are two carbuerattor adjustment screws, but I have tried every adjustment to no avail.

Any suggestions from the combined knowledge of all my fridgee brothers?