Is it jumping out of gear or hitting a false neutral (between which gears is it happening?) - You're running stock shifter (ie; no quick-shift)?
Weird.
Weird.
Gearbox Fail
Here's what I keep telling y'all about my gearbox.
https://youtu.be/6CbT0cDVpMs
Happened the lap before too, but not as blatantly.
https://youtu.be/6CbT0cDVpMs
Happened the lap before too, but not as blatantly.
1 - 20 of 23 Posts
Jumping out of gear. This is with a PCV quick shifter in GP shift mode. It seems to be a thing about 4th... always wants to go back to 3rd :-/ Also seems to happen more if I'm leaned. Good times.Is it jumping out of gear or hitting a false neutral (between which gears is it happening?) - You're running stock shifter (ie; no quick-shift)?
Weird.
Any slack in the linkage? I'd try some runs with the quick shift removed; if you have no problem with manual shift staying engaged then it's not the tranny. I don't know enough about the R3 tranny internals yet to be of much help if the problem persists, sorry.
Had my first races this past weekend. For the most part I used the clutch to up shift and had absolutely no problems. I tried doing clutch less up shifts but found the tranny very clunky to engage. You really had to hit the pedal hard in order for it to go into gear. I found I just preferred to use the clutch.
My SV had an undercut transmission though. Once you have one of those you get really spoiled! They are so smooth and effortless to use. Finding neutral is a pain in the ass though!
I will have a write up of my weekend later. It was a very good weekend.
My SV had an undercut transmission though. Once you have one of those you get really spoiled! They are so smooth and effortless to use. Finding neutral is a pain in the ass though!
I will have a write up of my weekend later. It was a very good weekend.
Look forward to the post. I need to do one too, once results are posted up. Saturday was great, Sunday not so much...
The courses we run don't require much shifting after the first lap - mostly 4th, grab 5th here and there, almost never 3rd, so I haven't run a QS or do a lot of clutchless (can't duplicate your conditions). What I was thinking is that some trannys require a slightly longer or shorter shifter throw, depending on gear. Could be the QS isn't allowing enough throw between 3/4 - again, I don't know this tranny well enough to know.
The courses we run don't require much shifting after the first lap - mostly 4th, grab 5th here and there, almost never 3rd, so I haven't run a QS or do a lot of clutchless (can't duplicate your conditions). What I was thinking is that some trannys require a slightly longer or shorter shifter throw, depending on gear. Could be the QS isn't allowing enough throw between 3/4 - again, I don't know this tranny well enough to know.
But what I don't understand is that I *do* get into 4th, and as that vid shows, I'm there for a while. Once in 4th I should be locked and loaded. Never gonna give you up, never gonna let you down. But somehow it gets kicked back into 3rd. I might try all manual shifting next time to see if that changes things, but it really shouldn't. Unless there's something wack with my GP shift linkage.Look forward to the post. I need to do one too, once results are posted up. Saturday was great, Sunday not so much...
The courses we run don't require much shifting after the first lap - mostly 4th, grab 5th here and there, almost never 3rd, so I haven't run a QS or do a lot of clutchless (can't duplicate your conditions). What I was thinking is that some trannys require a slightly longer or shorter shifter throw, depending on gear. Could be the QS isn't allowing enough throw between 3/4 - again, I don't know this tranny well enough to know.
The benefit of having racers on the forum is that they tend to be harder on the equipment and will find potential issues before the majority of other riders experience them. That, and being a first year model, there may be issues we haven't seen yet. All I can offer is to go through the simple stuff first - slop in the linkage, GP shift doing weird stuff, is something binding in the shift system, am I unconsciously preloading the shifter, those things before I'd jump into the gearbox. I really hope you haven't found a tranny problem.
The service manual talks about the shift rod not returning to position being a possible cause. It has a return spring just inside the crankcase cover - I'd maybe look at that. I run GP shift, Sato rearsets and kept the front chain sprocket cover. I had to remount the shift arm a few times so it wouldn't bind on the sprocket cover. The other causes indicated in Troubleshooting are further into the gearbox.
The service manual talks about the shift rod not returning to position being a possible cause. It has a return spring just inside the crankcase cover - I'd maybe look at that. I run GP shift, Sato rearsets and kept the front chain sprocket cover. I had to remount the shift arm a few times so it wouldn't bind on the sprocket cover. The other causes indicated in Troubleshooting are further into the gearbox.
My bike does the same thing when in the 11,000-12,500 rpm range in 2nd and 3rd gear, I dont red line it but for some reason it kicks me into neutral every once in a while if I dont shift before 11k, very annoying.
There should be info OUT THERE somewhere on the R25 that could be relevant. The R25 was sold for a full year and a half before the R3 came out and has the same transmission (though probably a different Map in the ECU).The benefit of having racers on the forum is that they tend to be harder on the equipment and will find potential issues before the majority of other riders experience them. That, and being a first year model, there may be issues we haven't seen yet. All I can offer is to go through the simple stuff first - slop in the linkage, GP shift doing weird stuff, is something binding in the shift system, am I unconsciously preloading the shifter, those things before I'd jump into the gearbox. I really hope you haven't found a tranny problem.
The service manual talks about the shift rod not returning to position being a possible cause. It has a return spring just inside the crankcase cover - I'd maybe look at that. I run GP shift, Sato rearsets and kept the front chain sprocket cover. I had to remount the shift arm a few times so it wouldn't bind on the sprocket cover. The other causes indicated in Troubleshooting are further into the gearbox.
R25s are raced a lot in Asia. There must be racers on an R25 Forum talking about this stuff. You might have to Translate some of their posts, though, which could be problematic since Google Translate kind of mangles Thai and Indonesian languages...
This might sound dumb, guys, but have you ensured your proper chain tension? When your weight shifts between the gearbox shift, for that split instant, the torque on the chain could cause the tranny to pop out like that. Just a thought?
I jus re-watched your vid, Contrails. You were definitely in gear for some time before it popped back down a gear.
I jus re-watched your vid, Contrails. You were definitely in gear for some time before it popped back down a gear.
Is there an aftermarket shift-star? That was another common mod in the SV community. It wouldn't surprise me that Yamaha made things sloppy for easy of newbie use, which when used at high effort comes back to bite.
R25s are raced a lot in Asia. There must be racers on an R25 Forum talking about this stuff. You might have to Translate some of their posts, though, which could be problematic since Google Translate kind of mangles Thai and Indonesian languages...
I'll ask Aussie mate Brando
https://www.facebook.com/BrandoRacing
Racing in Asia again this weekend.
A few problems so far, but they run a highly strung fast engines.
I'll ask Aussie mate Brando
https://www.facebook.com/BrandoRacing
Racing in Asia again this weekend.
A few problems so far, but they run a highly strung fast engines.
Aaand that was quick even though he's in the middle of the race of his life-
"Let me know if the r25 jumps out of gear if you've ever had issues, (not me, someone else)"
'No never, my opinion is maybe to oil, some oils are no good on gear boxes but really good for motors and some are really good on gearboxes but **** on the motor, you just gotta find the one that works
The repsol that we use in Australia is really good so is motul 7100 or 5100 or just plain old yamalube just gotta find the one that works
Could also be a quickshifter problem (if it has one) or it may have been damaged early in its life (like a missed gear) and that could be causing drama'
I haven't had any issues with mine yet after 3 track days and 4 races, but my friend has been having all kinds of trouble with his Ninja 300 dropping out of 5th and 6th gear with 2 different motors. When they took apart the transmission they found a very poorly designed shift fork (I think that's what he said, I'm not a transmission expert) that's allowing it. He's going to undercut it to try to solve it.
I did a lot of testing on the Annitori quickshifter and found I needed a much longer kill time that most bikes to get a smooth quickshift, 70-75 milliseconds.
I did a lot of testing on the Annitori quickshifter and found I needed a much longer kill time that most bikes to get a smooth quickshift, 70-75 milliseconds.
Yeah, the Ninjas have known issues. Everyone seems to have the issue who races the bikes.
My 3-4 shift is pretty smooth (the 1-2 and 2-3 could probably use tweaking). But in theory once you're in gear you should stay there unless there's some sort of pressure still on the shaft pulling it the other way. I highly doubt this is the case, but I will check it when my bike returns.
My 3-4 shift is pretty smooth (the 1-2 and 2-3 could probably use tweaking). But in theory once you're in gear you should stay there unless there's some sort of pressure still on the shaft pulling it the other way. I highly doubt this is the case, but I will check it when my bike returns.
Surely you shouldn't use quickshifter until 4th gear?
(ive never had one, but always clutchless in race shift pattern, I still clutch till 3rd off the start)
I'd be moving a spline and re setting it up at an angle that favours upshifts.
(ive never had one, but always clutchless in race shift pattern, I still clutch till 3rd off the start)
I'd be moving a spline and re setting it up at an angle that favours upshifts.
I usually do just clutch it until 3rd, yes.Surely you shouldn't use quickshifter until 4th gear?
(ive never had one, but always clutchless in race shift pattern, I still clutch till 3rd off the start)
I'd be moving a spline and re setting it up at an angle that favours upshifts.
Today I upshifted slightly lazy to 4th and it started jumping down to 3rd and up to 4th about 3 times at 75% throttle about but once I just gunned it it stayed. Didn't do it again but am pretty sure my lazy shift caused this.
I think I caught mine dropping out of gear this past race weekend. I think it dropped from 5th to 4th once or maybe twice. Hard to say cause I'm still fighting with my quickshifter a little.
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