I have done a check on this, and hope that someone can help. I was riding to work this morning, and I was running about 60 mph, when I slowed down, and turn the throttle, the bike had some hesitation. This happened twice. I have about a quarter of a tank of duel. I did use 89 octain last fill up. What kind of additive can I buy at Walmart that won't hurt the bike. Also any other suggestions would be appreciated. Thanks.