The issues is in warm temperatures, the saws vapor lock, bad! A mm and some heat shielding helps. I don't believe it gets all that hot in Nova Scotia, at least not for very long, so likely will never be an issue for you.
Here in Nova Scotia our summer temps can reach low 90's on occasion. That is when I was having the most starting issues with my 550. The dealer changed carbs and I haven't had an issue with it since. I was probably a lucky one, but my first 562 started wether the temperature was -20 or plus 95. It still is in my stable but has been regulated to a backup status. I love the 5 series of Husqvarnas as much as the 2 series. The 3 series not so much, though I like 357's and 372's.
The carb overheats to the point the fule turns to vapor, when this happens the primer will no longer function. Again you can work around the issue, but you shouldn't have to.
It is not the carb, rather the lack of air flow around the carb and intake that causes the problem.
Right.
The newer saws still have overheating issues. It's a heat issue plane and simple. The devider is inadequate, their isn't suffecant clearance between the carb and other parts of the saw, like the cylinder and parts of the case. They're too many fuel lines all over the place, do to the stupid priming setup. These lines pick up heat like crazy. They rerouted the main fuel line so it's farther away from the cylinder this seems to help. They cut corners to save cost and it has hurt their reputation.
When the saw is running their is constant air flow, when the saws is off, the carburetor fuel lines get heat soaked, the fuel turns to vapor, the saw becomes impossible to start until it cools down.
