This handy little device is intended to simplify the pre-measuring of oil for two stroke fuel/oil mixtures. It’s well thought out with predetermined graduations marked on one side for mixture ratios from 16:1 up to 70:1 and measurement marks on the other side in fluid ounces and CCs. Actually, it’s convenient for measuring ratios for virtually any mixture, be it liquid herbicide, fertilizer or what have you.
The item is made by KAM-Tech of Torrence, California and is called the “Ratio Rite”. It’s available on line from multiple sources such as eBay and Amazon, as well as through many small engine or motorcycle dealers. It’s well made, simple to use, and inexpensive. Particularly for those that work on or frequently use small two stroke engines, this tool is most handy to have around.
There’s an include YouTube video below for those interested in a little more detail.
I use a liquid food feeding injector to measure out 1.25 ounces of oil per gallon of gas. 100:1 ratio using AMsoil.. I use this ratio on equipment labeled for 30:1 and up and have never had problems..
The only time I have had problems is when I was paranoid and went richer on the mix.. Teardown showed that things were gummed up… As soon as I leaned out to 100:1 no more problems( no smoke either).
Contrary to (some) popular opinion, a little more oil, particularly depending on the type, to create a richer mixer is usually not “better”. Besides the oil and carbon accumulation you mention which creates other issues such as gumming things up, a richer oil mixture actually leans out the air/fuel ratio.
I believe there are two really critical components to the two-stroke fuel/oil mixture:
> quality and type of oil
> complete, and I mean COMPLETE mixing of the oil into the fuel