Originally Posted by
RIDE-RED 250r
ABSO-FRICKEN-LUTELY!
Everything I own gets 91 non-ethanol except our two newer vehicles... my saws, weedeaters, wheelers, boats, '78 Chevy, etc etc... A bit more octane rating than minimum recommended doesn't hurt a thing.. You will lose a very small amount of performance, but you won't even notice it unless you are literally dyno tuning...so long as you are only a few points higher like running 91 non-ethanol vs 87 with 10% ethanol... Jump up to 110, you will likely actually feel a loss in performance, but again, it won't hurt a thing. Don't try the other way around though!
And FTR, 2-stroke tuning is really no different than tuning a 4-stroke, both need a certain amount of fuel to run properly, both can burn the top end down with a lean condition, both will run like garbage if too rich... But in fact, I find it much easier to tune a wing-dinger as I feel they much more clearly communicate what they want than a thumper, in my experience anyway. Thumpers are much more subtle.