Gearbox Fail - Page 2 - Yamaha R3 Forum
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post #11 of 23 Old 09-28-2015, 04:40 PM
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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.




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post #12 of 23 Old 10-01-2015, 09:32 AM
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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.

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post #13 of 23 Old 10-01-2015, 10:08 AM
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Originally Posted by FangShui View Post
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 blame the Internet.
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post #14 of 23 Old 10-01-2015, 11:00 AM
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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 blame the Internet.
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post #15 of 23 Old 10-03-2015, 09:39 AM
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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.

Cheers,
Jesse


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post #16 of 23 Old 10-03-2015, 10:37 AM Thread Starter
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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.
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post #17 of 23 Old 10-03-2015, 11:04 AM
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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.

I blame the Internet.
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post #18 of 23 Old 10-03-2015, 01:12 PM Thread Starter
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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.
I usually do just clutch it until 3rd, yes.
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post #19 of 23 Old 10-09-2015, 10:44 PM
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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.

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post #20 of 23 Old 10-19-2015, 09:42 PM
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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.

Cheers,
Jesse


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