plus 40:1 is the absolute minimum i want to run my stuff with oil wise. i like 32:1 to make sure everything is oiled well. Those long cuts in big wood put a strain on a saw as does running one in 90+degree heat just like a weedeater. 32:1 will not coak or carbon up, does not foul your plug or give you negative effects. That is if your tuned right. You have to retune to run it optimal. Some big saws have shown a HP improvement in cut times from 32:1 to 40:1 they may have put them on the dyno on AS i cant remember now. But the difference was not real world noticeable.
And like i said 92/3 octane is a selling point in 2 stroke fuel. yes the stihl owners manual says 89 but i think that is to compensate for people running stale fuel. ANd if you get ethonol fuel the higher octane allows it to still be ok once you soak up water lowering the octane in the fuel. Any two stoke will run fine in a two stroke at 87 octane. How can it detonate when the motor is running at 15,000 rpms and every power stroke it fires? everytime the fuel is in the cylinder it fires, and there is unburnt fuel in the exhaust. Thats what all this epa stuff tries to stop is the amount of fuel that is spent. They are putting strato carbs on them or cats in the mufflers to get rid of it or make the muffler so constrictive and hot that the fuel burns off in there. this is whats killing your modern saws is those hot temperatures. Getting rid of that stuff and letting them breathe easier with all the fuel that they want with plenty of oil to make a just wet exhaust is what you want. If your not getting oil out the exhaust then the exhaust side of your piston is not as oiled either and thats the side that scratches first.
