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on an ultra classic especially you are experiencing drag when you slow down and when you are driving, different gas often can be stronger smelling depending for example i put 91 octane and when i drive down the road i can smell exhaust both when driving and backing off, i some times can remedy it with the wind baffles closed on front on the bike, for what ever reason opening up those baffles creates more flow of the exhaust to come back over the bike. Any thing you can do to change the drag factor behind that luggage rack to improve or eliminate the issue also different pipes, leaning out the fuel mix i have a road king (03) with rinehart headers and do not have any fuel smells but the ultra makes me almost sick!

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Q: Smelling exhaust fumes on harley ultra when slowing down?
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