Clean out the carbs,
New plugs
Clean / replace air filter
Try it again, then get serious with the RC Valve - when I bought mine I thought it was quick. After following Anonymous Shysters advice I cleaned and set my RC Valves (HRC way- standard was a huge improvement, but HRC way and clean is worth the extra time and effort) Just pulled power wheelie in 2nd exiting a corner
Not sure if it helped much but while the exhausts are off, cleaned them out too.