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)?
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.
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...
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.