2004 Yamaha FZ6

VEHICLE: 2004 YAMAHA FZ6 MOTORCYCLE, PURCHASE NEW 12/93. INTERMITTENTLY, THE ENGINE SURGES, CUTS OUT, LUGS, STALLS/QUITS AT VARYING TIMES AND SPEEDS/RIDING SITUATIONS. STOPPING THE BIKE, TURNING IGNITION OFF AND ON TEMPORARILY CORRECTS PROBLEM, BUT PROBLEM ALWAYS RECURS. DIFFERENT WEATHER TEMPERATURES AND FUEL GRADES HAVE NO POSITIVE EFFECT. BIKE MAY STALL AT AN INTERSECTION STOP, AT HIGHWAY SPEED, ACCELERATING OR DECELERATING, ON STRAIGHT OR CORNERS, WHICH CAN BE TERRIFYING--NOT TO MENTION POTENTIALLY FATAL. NOTE: DATE LISTED BELOW IS ONLY THE MOST RECENT--PROBLEM OCCURS ON ALMOST EVERY RIDE. *JB

2004 YAMAHA FZ6 13K+ MILES. DURING A SUSTAINED CRUISE, WITH A SUSTAINED RPM BETWEEN 4K AND 5K RPM, THE ENGINE BEGAN FALTERING/BOGGING DOWN AND RUNNING VERY ROUGH. ACCOMPANYING THIS ISSUE, THERE IS A MARKED SENSE OF DECELERATION UNLESS MORE THROTTLE IS APPLIED TO COMPENSATE FOR THE THE LOSS OF POWER; THE DECELERATION, AT TIMES, CAN BE QUITE SUDDEN. THIS PROBLEM TENDS TO OCCUR BEYOND 1/2 HOUR OF OPERATION. IF DOWNSHIFTING OR UPSHIFTING IS PERFORMED DURING THE ENGINE FALTERING, THE RESULT IS A STALLED OUT ENGINE UNLESS SHIFTING IS PERFORMED VERY QUICKLY. STALLING OUT WHILE DOWNSHIFTING FOR A FULL STOP AT AN INTERSECTION GETS DICEY GIVEN THE AMOUNT OF OIL/WATER USUALLY FOUND AT STOP LINES AND THEIR APPROACHES. TURNED BIKE INTO DEALERSHIP, REPORTING THE ABOVE SYMPTOMS ALONG WITH REPORTS OF THROTTLE POSITION SENSOR PROBLEMS REPORTED BY OTHER FZ6 RIDERS. DEALER COULD NOT REPLICATE THE PROBLEM AND SIMPLY REPLACED THE SPARK PLUGS. UPON RECEIVING THE BIKE BACK FROM THE DEALERSHIP, THE PROBLEM PROMPTLY RETURNED ABOUT 40 MINUTES INTO THE FIRST RIDE.

MY MOTORCYCLE WILL STALL AND/OR RUN ROUGH OCCASIONALLY, AND NOT IDLE WITHOUT ADDITIONAL THROTTLE INPUT. IF I TURN THE IGNITION OFF AND RESTART THE MOTORCYCLE IT WILL FIX THE PROBLEM FOR A PERIOD OF TIME. I AM VERY CONCERNED THAT THE MOTORCYCLE WILL ENCOUNTER THIS PROBLEM WHILE TURNING AND CAUSING INSTABILITY THAT MIGHT CONTRIBUTE TO A CRASH. IN ADDITION, I DO NOT LIKE HAVING THE THOUGHT OF THIS PROBLEM IN MY MIND EVERYTIME I AM RIDING, AS IT TAKES ENOUGH CONCENTRATION TO AVOID OTHER VEHICLES AND MONITOR ROAD CONDITIONS. I HAVE NOT REPAIRED THE PROBLEM YET. THANK YOU FOR YOUR TIME.*AK

IDLE SUDDENLY GETS ROUGH THEN ENGINE QUITS/STALLS AT RANDOM TIMES, MOST OFTEN AT LOW SPEED AFTER DOWNSHIFTING, BUT HAS HAPPENED AT HIGHWAY SPEEDS ON PARKWAY IN TRAFFIC. I'M INVOLVED WITH AN ONLINE USERS GROUP OF FZ6 OWNERS (ABOUT 100-150 IN THE GROUP) AND ABOUT 20 - 25 PEOPLE HAVE HAD TO GET THE THROTTLE POSITION SENSOR (TPS) REPLACED TO CORRECT THE PROBLEM. (WITHIN THE 1ST YEAR OF OWNERSHIP) I BELIEVE MY BIKE IS STARTING TO EXHIBIT SOME OF THE SAME CHARACTERISTICS THEY ALL HAD AND FEEL YAMAHA SHOULD LOOK INTO THIS FOR A RECALL BEFORE SOMEONE DOES INDEED GET HURT OR KILLED IF THE BIKE STALLS OUT WHILE ON THE HIGHWAY OR ANY OTHER ROAD.