550XP... is there a knack to getting them started?

[skyhuck]

What are these "hotter" plugs???

 

My lads 550 would not start once hot, I messed with it for ages, but it would not go. Checked for spark, all was good, but would not start!!

 

In the end I removed the plug from my 540 and tried it in the 550, started fine, so I presumed the plug from the 550 must be duff, I put it in the 540 expecting it not to start, but no it started fine:confused1:

 

Both saws have been starting and running perfectly since

 

All I can think is that the 550 needs a spot on plug, but the 540 is not so fussy.

[Stubby]

What are these "hotter" plugs???

 

 

 

NGK CMR7H Rather than 6H .....

Edited May 30, 2016 by Stubby