i would suggest cleaning the carbs.. but you can try tapping on the bowls lightly with a tool and then riding it around for 10 mins.. you might get lucky and loosen something up in the carbs and it will rev up again.. i do it when my bike is acting up and it has worked before.. if you do open your carbs then take one apart at a time, dont mix any parts and remember where they go back.. and remember clean airfilters are your best friend. i have three k&n filters. i change it out after every 5-6 gallons with a clean one.. great insurance for the motor and no thats not over kill.