Are you running premium fuel? If so regular is all you need. These bikes have a problem with carbon buildup on the valves causing SVS
. Try a good dose of Sea Foam and search the Forum for more on SVS cure. I use Marvel Mystery Oil and sea Foam every other tank of fuel and have not had the SVS. You also need to run some Stabil for the ethanol. I hope someone has more info for you. That's all I have! Oh ya, they also puke alot!!! That's another issue!!