my rc51 will just crank now. if i give it some throttle it will start but as soon as i come off the throttle it dies. the hi rev/choke doesnt help either. changed plugs, same thing. there is spark and gas but the front plug doent give off a big spark like the rear plug. the bike is stock. what could it be????? :mad:

Check the coil for that plug

changed the coil, no change.

Any FI codes?

no fi codes

Do you have a power commander? If so remove it and see if you still have the problem

i didnt have a power commander. it ended up being the fuel pressure regulator. she's working great now!