I had 15-gallons in the vented tank since Aug 2016 (9 to 10 Months)
I have the test tube type tester that tells alcohol percentage, but not sure how to tell how much water it had absorbed?

I may be having some other issue wit the carb, but right now I am thinking the old fuel?

The problem is the engine won't idle right, and when I punch the throttle the engines seems to go lean? Once the RPMs come up it seems to run fairly good. This is in comparison to last year. No changes were made, and last year it would blow the tires off, now it wants to fall on its face?