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Discussion Starter #1
I love my bike, but this year it developed a problem that ruined my entire season.

Symptoms:
My 2014 FZ-09 has 30 000km on it and started stuttering while cruising around 30% throttle. It was getting worse as time went on. The stutter was becoming more frequent, under more riding conditions and was becoming violent. The bike was also starting on the 3rd or 4th pull instead of the normal 1st pull. It got so bad that is was happening in low speed situations. Once, it happened in the middle of a busy intersection during a left hand turn... only my angel and willpower kept me up. Disconnecting the battery or unplugging the ECU would improve the situation for a while, but after 50 km it was back.

The process:
I asked my Yamaha dealer to look into it during my maintenance service and they said it was bad gas (which ticked me off). Later they told me it was plugs, (which I had changed the day before myself). So I started cruising the forums to find a solution. I changed the air filter to a K&N and did the plugs. Then I did a reflash through VcycleNut. It didn't fix the problem. Then I replaced the injectors and tightened the throttle cable. While these all improved the bike, they didn't fix the underlying problem.

The Solution:
Finally, I decided to check all of my electrical connections. When I checked the connectors for the Accelerator and Throttle Position Sensors, I found condensation inside. I cleaned them out with electrical contact cleaner, let them dry and put it all back together. Low and behold, no stutter, jerking or hiccups. On top of that, 150km on, the bike is running smoother and starts 1st pull. My guess is that the APS and TPS must have been sending bad readings to both the throttle actuator and ecu. The actuator was opening and closing according to bad signals and the O2 sensor was reading rich as a result. The ecu was probably leaning the bike out based on the O2 data. Probably why it got better when I disconnected the battery. As the emissions data is rewritten in the ECU, the bike is returning to its normal fueling. Unfortunately it took the entire riding season to discover.

Recap:
Clean the electrical connectors for the APS and TPS to fix the problem. I plan on doing it every spring.

P.S. The VcycleNut flash greatly improved the bike. They have excellent customer service and maintain prompt correspondence throughout the process, it is also a cheaper alternative to throttle commanders and O2 deletes. Also, the manual states 1/4" play in the cable, that is WAY too much. Tighten to where its comfortable. (No wonder my right hand was always tired an numb.)
 

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Well that is the best news I have read in weeks.

My ECU is off to Vcyclenut for a reflash soon.

Like you I exhausted my dealer resources on getting a solution.
 

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Discussion Starter #5
Yeah. I'll do that when winterizing it. I'm pretty sure the condensation got in there during winter storage.
 

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Mind pointing out which connections it is on the parts fische so us lazy people don't have to go digging in the service manual?
 

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#11 and #13 in this pic.


Sent from my SM-G950W using Tapatalk
 
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Can you highlite them in red so us really lazy gits dont have to try and spot them...:p
 

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Several years ago some overzealous rinsing put water into my APS.
The code showed up right after the wash job.
I was in denial for a couple of weeks until it totally quit out in the middle of nowhere!
After I replaced it I cut the old one apart and found this---------
 

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Was actually looking for O2 sensor cleaners yesterday and ran across electrical contact cleaner... never really would've thought there was such a thing but there is! It is a "petroleum distillate / alcohol based precision cleaner" that basically dries/evaporates instantly. Would probably keep those connections spotless.
 

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I use that for all sorts of cleaning. Follow up with dielectric spray grease.
 

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Discussion Starter #13
blkbrd,
They are marked in the diagram as follows: FZ-09.png
You will need to lift the tank to access them. I used electrical contact cleaner.
 

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Way to stick with it!!!! Finding elusive problems like that is not for the faith of heart. Good job! Sorry it blew your season all to hell, but your sweat and frustration will benefit many fellow riders in the future.
 
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Check post # 13 ..you find those on the throttle bodys and you got the connectors...
Yeah got that thanks, but I was hoping for an actual photo :)
I'm having severe issues with my 2018 model momentarily and repeatedly losing power / cutting out so I need to try this.
 
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