2004 Yamaha FZ6 Fuel system Problems

“In september of 2004 at approximately 5000 miles, the motorcycle began idling poorly and stalling. Had to turn off the key and then back on before it would start again. Yamaha replaced the throttle position sensor after bringing it to them twice which corrected the problem. I have almost 13000 miles on it now and it is doing the same thing again. It is a safety issue because it is distracting and hinders my ability to watch traffic and frequently stalls at traffic lights.”

“I was returning home to plano, tx from a weekend trip to colorado. I was about an hour away from home, when I started to experience engine hesitation whenever I released and reapplied the throttle. The next day, the hesitation was gone, but I noticed that my fuel mileage had gone way down (formerly 42-45 mpg to the current 35 mpg). The engine is also running rich, enough that I can smell unburnt fuel in the exhaust. The engine also has started to idle erratically, fluctuating in rpms.”

“I have a 2004 Yamaha fz-6 and I believe the throttle position sensor is bad. The bike stalls and runs very erratically at low rpms. I had to pull to the side of the road and turn the kill switch and key off to reset the system and then it started again. If this were to happen in a high traffic area the bike could stall and cause an accident. I have done nothing to repair this problem yet, I am waiting to see if there is a recall on this part. I know that this is a very common problem with this model motorcycle.”

“I have had issues with my Yamaha FZ6. The manual advises to use 87 octane fuel. I have been using 87 until the bike started to idle at very very low intervals. Causing loss of power when driving, or stopped. Normal idle is 1320 RPM. Idle will drop between 600-800 RPM when stopped causing the bike to die (every time) or while driving the bike will idle fine then the RPM's will drop way down , then back up then down then way back up. I took the bike to the repair shop and they said they would adjust the bikes idle. …”

“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.”