Posted by Bret4207 on May 18, 2018 at 05:28:33 from (64.19.90.196):
In Reply to: Chain Saw Gas posted by riverslim on May 16, 2018 at 09:42:48:
I'm not going to try to claim expert status ion this, but I will give my opinion.
I've owned and used 2 stroke machines for almost 50 years. I've even owned, and used commercially, the Graham-Paige Rototiller someone mentioned way up the page that wanted 16-1 mix ratios. I've had failures at 16-1 and at 50-1. IMO, with most 2 strokes in good condition, ie- good seals, not already worn badly, you can get away with a much leaner mix wit todays oils than you could back in 1965 when it was pretty much straight 30 wt or nuthin'. But you have to use some common sense. The 501- mixes of today are as much recommended to meet emissions standards for small engines as they are for any reason related to performance and longevity. While the old 20-1 30 wt mix was great for keeping the flies out of your face, it causes people to throw a hissy fit when they see it today. Better oils, better designed engines, better bearings, etc. all allow us to use a leaner mix. But there is a trade off point. I believe it varies from machine to machine and varies with conditions, use, temp, machine age, user practices, etc. I regularly run saws designed for 25-1 or 30-1 mixes at about 40-1 using good quality modern oil and FRESH NON-ETHANOL fuel. Clearances in the older stuff differs from todays stuff. I don't use 50-1 ethanol mix in my old Mac 300 or Pioneer P-50. You have to use some common sense. I'd always recommend going a bit richer than leaner. With a brand new machine, follow the makers recommendations. With Uncle Bills 1962 Weed Wizard brush saw...you want to go richer, but you don't need to run it at 20-1 with a good modern oil. Try 30-1 and see how it runs. If it seems hot or doesn't sound right, maybe 25-1 is required. If it runs good you can try 35-1 and see if it still likes it. 50-1 is going to be too lean for a lot of old equipment. Heck, 50-1 is too lean for some not so old equipment! You have to observe and engage the grey cells.
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