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I have a 2003 rc51. it runs fine except when I open the throttle more than about 1/3 to 1/2. Its not the rpms because I can slowly creep up the rpms while riding, but when I try to open it up it will sputter heavily. Ive changed spark plugs, checked the fuel pressure regulator and even run injector cleaner through it. When its not moving, I can rev it all the way up will no issues, it just happens under load while riding. ANY INFORMATION OR SOLUTIONS WOULD BE GREATLY APPRICIATED! Thank you
 

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i had this problem years ago in a car, and it turned out the coils were weak. It would still spark and run, but at full load low to mid rpm, the fuel would overwhelm the weak spark, and no ignition until I backed off again. I did the coil check per shop manual, and they were bad. Can't remember if it was the primary or secondary windings that were bad.

I hope this helps.
 
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