I've been running outboards for 6 yrs now on my TI. When I run E10 fuel when the motor sits for a week or more the fuel clumps up into a white gel that plugs up all the jets,(kind of like margarine). When I use ethanol free recreational fuel (available at many gas stations around here), all my fuel problems go away. Every 6 months or so I go out and buy 5gallons of recreational fuel, the Honda dealer recommended I use either recreational fuel or aviation fuel with Yamaha fuel stabilizer. As a licensed pilot I can legally buy aviation fuel, but why bother, the recreational fuel does the job just fine, and I can buy it pretty much anywhere (just make sure you don't put it in your car, around here there is a sign at the pump stating it's illegal to put recreational fuel in cars).