On Sat, 26 Mar 2016 06:57:28 -0700 (PDT), Pavel314
wrote:

I have a few two-stroke lawn equipment tools that use different gas/oil ratios. What is it in the design of a two-stroke engine that requires a certain ratio? Is it the compression ratio? I googled around but couldn't find a good explanation on why the weed whip needs 50-1 and the chain saw needs 40-1.

Paul

If they are from the same time era, can't you spit the difference?
45:1 or not.