Today i started my XR65O to check before a Pismo run tomorrow. When I rev the throttle fully open the bike seems to splutter and misfire (the bike is stationary). At lower revs it runs perfectly and starts OK. When I rode it a month ago it ran fine. There is a tiny amount of smoke when it misfires.. Spark plug is fine not fuel problems and air filter is OK. Should I just ride the bike?? and is this normal?? My friends 600 exhibits a similar symptom. My bike is only 6months old and ridden 4 times Does anyone have any ideas… This is the first time I’ve revved it this high and not been moving!! A quick response would be greatly appreciated.