32:1 is way too rich. Over time you will get a lot of caron [unburnt] oil in the piston/cyl. You are much better off using what the manufacturer recommends. 40:1 is fine, I run both 40:1 and 50:1, and I use VP and Aspen fuels. In both my Stihl and Echo equipment.
Yea, was wondering about valves and seats. Also 4 stroke running a bit cooler.
Am trying not to use 2 different cans of mix, so might just stick to 40:1 for the saw's and Combi's iny work van, and 32:1 for my firewood saws.
They will last longer at 50:1 with a synthetic oil. HP Ultra was designed specifically for that application. Too much oil will cause carbon buildup on valves and valve seats.
i run 32:1 in my br600 the first time i ran it with that oil it have too high of octane fuel and didnt like it at all. but that gas is all gone and it runs fine i just had to adjust the carb.....so far no issues but i havent looked for any either. i have just made sure to keep the valves adjusted. it really didnt like 32:1 with the av gas at all but seems not to care about the extra oil so far
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