OK, I bought a 455 Rancher brand new a year ago and it has always had a warm starting problem. It always cold starts on the 4-5th pull. Shut it down and let it sit for 5 minutes and you might have to pull it 40 times. What usually happens is it will fire right away, begin to rev and then cut out.
I have about five friends with 455 Ranchers and 2 or 3 of them say they have the same problem. But, a buddy told me the other day that his 455 has 'aways been super easy to start' so it must be possible to fix whatever's going wrong. I did a little cutting with this saw today and I was a little torqued with how hard it is to warm start with the care it receives. I always use fresh, super unleaded and Husqvarna mix oil 50:1. My old 272xp and 281xp always start with one pull and this little 455 is giving me fits.