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2009 ninja starts to bog at take off sounds very muffled and will pick up slowly only up to 55mph at times after riding for a while it will start to sputter get higher pitched and pick up speed and ride normal last time I rode it ran crappy and I could smell gas and had to keep on the throttle to keep it on don't want to just throw away my money trying to fix it any idea what it could be maybe carb problem got 41000 miles on it