I've seen the mileage drop but never the pop/spit. Out of curiosity are they older bikes? I know ethanol will dry out and destroy some older rubber products and certain types of gaskets.Lost about 5 miles to gallon and am STILL fighting a pop and a spit in both bikes. Still trying to find the right jetting for them to run on the blended fuel.
Yup, Just had to replace or rebuild the carbs in my mower, weed waker, and hedge trimmer over the last three weeks because of this crap.My brother used to have a 98 Honda Valk with 6 carbs and he used to go to far lengths to not use ethanol. I believe it eats the insides of older rubber parts, like fuel lines, etc, and deposits the gunk in the jets. On the Valkyrie it was a hassel cleaning all 6 jets. With the fuel injected bikes it's not supposed to affect them as much but carbs and ethanol don't mix.
I could see the 94 but the 05 should be fine. One things for sure ethanol will not sit for any length of time without a fuel stabalizer in it. We're not talking months but weeks. It will clean out any gunk in the system when new which can cause all sorts of issue on older machines as well.1994 FLH and a 2005 FXSTB