Have you tried doing the hot start WITHOUT the decompression valve being depressed? I scrounged some ash the other day (a nice trunk section about 3 ft diameter x 7 ft long), and chopped it into sections so the guy who donated it could use his tractor to load it into my trailer. Of course, he asked me to noodle the bottom trunk section in half for easier loading AFTER I had shut the saw off. I tried the primer bulb, setting the choke on then off (high idle), and pulled. And pulled. And pulled.....
I finally got my less-than-a-year-old 562XP to start, noodled the bottom section in half, and shut it off again.
Then the guy asked me if I'd cut the stump off at the ground. Since he gave me free wood, I said "sure", and finally got the saw restarted. I was almost finished with the stump (chain was getting dull), when my saw ran out of fuel. I finally said "I'm done for the day", and put the saw away.
After getting back home (about a 15 min drive), I added some Husky premix to the fuel tank and tried to start the saw.
I tried it choke on, choke off, with the primer bulb, nada.
Today (after it had been sitting for a couple days), it started right up with no difficulty (choke on, pull till burble, choke off, pull 1 time, started).
In looking online about this problem, some folks have said that the hot/warm 562XP saws start better with the decompression valve not used. Next time I've got my saw nice & hot , I'll give this a try.
Any other suggestions out there?