Hey folks, I'm resurrecting this thread!
I recently have been experiencing the same issue, under hardish to hard acceleration. While I'm not sure if it has happened in other gears, I know for a fact it's happened in 2nd and 5th gears, AFTER the shift was complete. For example, two days ago I shifted into 5th gear, accelerating hard. 1-2 seconds after the shift, the bike pops out of 5th, I hit redline, pull clutch, kick up, release again... all good, but I became an instant squid and almost went into the side of a car (was in the process of passing and changing back to right lane, during a left bend).
It has gotten slightly worse over the past 2 months or so... In an effort to figure this out, I'll lay out everything that COULD be a factor and hopefully you good people can weigh in:
-I am using Mobil 1 4T synthetic (have been using this and loving it for about 9k miles, bike has 19k altogether). I am due for an oil change, and bike has original clutch.
-I went through a period of clutchless shifting earlier this summer, found it much easier and smoother to change from 3rd gear up, and when accelerating hard. I stopped shifting clutchless completely the first time I experienced my bike pop out of 5th gear while accelerating hard onto a highway.
-I lubricate clutch cable regularly, and have enough free play. I ruled out the cable by trying my best to replicate the problem on a back road by putting slight pressure on the clutch, releasing at different speeds, etc.
-I have been lazy at times with my riding boots, and have used regular Nikes. Can't confirm 100%, but I thinkkkk this problem with popping out of gear has only occurred while riding with these sneakers. I know I'm not getting as much kick on the shifter because I've also hit neutral instead of 2nd a couple of times with these shoes, and that hasn't happened in a while. Then again, I've ridden the last 18k in all kinds of boots/sneakers/shoes and never had the bike pop out of gear until now.
-I ride the bike hard, almost every time I ride. I commute 35 miles each way with stop and go, dotted yellows that I take full advantage of, and a couple of highway ramps that I enjoy thoroughly. On the weekends, I head west to country roads and have fun. I also have done a fair amount of 2-up riding in the mountains, and I push the fz6 as hard as it will go. My gf is a fellow adrenaline junkie!
I've read a lot of posts regarding this issue, and it sounds like my problem is one of the following:
1) Dogs and/or shift forks are worn. That would suck.
2) I'm shifting lazy... which caused this issue and probably has led to dogs and shift forks getting damaged.
3) Possibly the transmission detent spring has gotten weak and is causing problems shifting completely into gear. Cheap, easy fix. They sell an upgraded fix for the R6 and a handful of other bikes that people swear by, but nothing for fz6 unfortunately.
So obviously, my first step is going to be an oil change and to ALWAYS wear my riding boots. I will also move my shift lever one notch down to make a more solid contact.
If the problem continues, I'll change the detent spring.
If the problem continues, I will sell the bike. I don't have the space to pull the engine and open up the case... and a shop would charge more than what I paid for the bike 3 years ago.
Here are some interesting posts I discovered throughout this process:
http://www.600riders.com/forum/fz6-technical/25516-false-neutrals-3.html
SOLUTION: Transmission 2nd Gear Slip : Yamaha R6 : R6 Forum
Any and all suggestions, speculations, and wisdom is more than welcome!
gratuitous bike pics:
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