July 19, 2014
Oil ratios will always have varying options, the nitty gritty is that for the the average user 50:1 will work just fine in all air cooled 2 stroke engines. Also with out day in day out commercial use, wear on the engine will probably never be noticed between different mix ratios.
Basically the harder the engine is run, and the duration that engine is run at wide open throttle/heavy load, dictates what oil ratio you should use. For example if you are to start up a chainsaw, let it warm up, and then non-stop back to back buck up huge pieces of wood with the bar fully buried cutting flat out...you would probably be better served with a 32:1 ratio. If you run that same chainsaw to only cut small 2" limbs all day, a mix ratio of 50:1 would be just fine. same goes for a string trimmer that you run part throttle most times doing light trimming, 50:1 is fine because the load is so light. Its more about what conditions the engine actually sees in use, than the engine design itself. Do note that the oil ratio change does change the tune of the engine slightly so you would be best served sticking with one ratio. Don't over think it.
the most important things are a well tuned carburetor, good fuel, good filtration of air and fuel, and letting the engine warm up a few minutes doing light work before going flat out.
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