James, Sooo.... If Andy ports the serial number will he get higher torque output?
Andy, The oils are better now---you can run anything on 32/1 even the old Macs that specified 10/1.
I've got a thundering old 650 too but being somewhat like Stumper I prefer 32 to 1 also.It only smokes when you first start it up ,due to a bit of oil sucked in by the impulse oil pump,old ya know.I have a old Mac 650 that I have ran Stihl oil at 50:1 in for over 12 years with no problems at all. know if you need
See Ya
Mike
You run saws & "PLAY" with them long enough the chances are you will have such a failure. A lot of things happen as a saw ages.I agree Mike... I guess the day I actually do have an oil related failure, maybe I'll change my tune. Until then it's 50:1 Stihl synthetic in everything.
Gary
The most important thing when determining mix ratios is the level of lubrication. If you're going to mix 1970's era 40wt oil with your gas then you need to mix it at the ratios specified back then for that type of oil. If you're using modern synthetic mix oils then you will get superior lubrication by sticking with the current recommended ratios of 50-1 or even 40-1 for large displacement saws over 100cc.
That answer will still apply regardless of the saw in question.