I just looked that up for mine. I found this chart: http://www.psep.biz/store/ryobi_trimmer_spark_plugs.htm it depends on which trimmer you have
.025 inch per the manual.
25:1
50 to 1
32:1 gas/ oil I have one and the mixture was on it.
My ryobi grass trimmer is having fuel pick up . how is the best way to clean the fuel lines and fuel filter
spark plug is good but when its plug in to coil on spark
32 to 1 32 to 1
20w/50 is what comes with the 4-cycle string trimmer. While Home Depot is the sole distributor of Ryobi tools, they do not have the oil in Montgomery, AL
Here you go: http://www.managemyhome.com/mmh/lis_pdf/OWNM/L0805579.pdf
Some craftsman trimmers are nothing more than different color Poulans, others are made by Ryobi.
The ratio of gasoline to oil is usually written on the fuel cap or on a sticker nearby. The one I have is 32:1.