Difficulty starting when engine is warm
I have a 2000 RC51 I just bought about 2 months ago. Fairly stock except for a change in gearing and a power commander. It started and ran amazing up until about 3 weeks ago. Then it would start no prob when cold, but was difficult to start when the engine was warm. I have to mess with the throttle now and I'm not sure why.
Took it to a dealer and apparently it needed to be tuned up. Figured that was correct since the bike sat for 1.5 yrs. before I bought it. They drained the fuel and added additive, changed the plugs, cleaned out the airbox and put in new air filters.
Left the dealer yesterday and stopped a 1/4 mile down the road to top off the gas and the bike was still difficult to start. Like I said, never had to mess with the throttle when starting and now I do.