smokinjay said:
[At 31:1 plugs can get fouled up often. Oh I would not let it run out of fuel again. My 880 hard starter when it runs out...Wow You only make that mistake a couple times.
I can't speak for how things go in all saws for all people but. . .
I've been running a 20 to 1 mix for 40 years. With any of my "more modern" saws built from the late 70s up to present - I've never, ever fouled a spark plug.
I have had to clean the plugs a few times in some old, slow running gear-drive Homelites and Mall 2MG saws.
As to the following - all used hard and none ever fouled a plug. Poulan 46 and 55 cc saws, Efco/Deere CS56, Dolmar/Makita DCS510 and DCS6401, Husqvarna Rancher 55, Echo CS530, Stihl 040, 041, 041 Super, S10, Contra, 045 Super, 056 Magnum II, and maybe a few more I'm forgetting at the moment.
I've never bought any high-end two-stroke oils and that might make some difference. I've been using the cheaper stuff in gallon jugs for many years. Usually with ratings for TCW and general air-cooled engine use.
When you get right down to it, few of the high-price oils carry API ratings anyway. It's often based on brand-name trust.
I can say for sure I've never had wear problems and never had any fouling problems with spark plugs. Spark arrestors screens in mufflers - yes. No problem once removed.