Went to the track today and started the bike up without choke. Didn't wait for it to warm up. I cruise slowly about 50 m to get out on the track but the bike seamed to get to much fuel so I stopped. I couldn't keep the bike running. Tried to start it again but no luck. Bump started it but it didn't run clean. Tried to kick start it and the only way to get it started was to twist the throttle, couldn't get the bike to run clean and snappy. Where do I start searching? TPS, connections, spark plug, valves...... Last time I rode it it was running fine, the only thing I did was to refuel, change airfilter, wasch it and made adjustments to the throttle cabels. The bike has 20 hours on it.