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Why won't my YBR125 shift?

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someguy
Borekit Bruiser



Joined: 01 Feb 2015
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PostPosted: 18:55 - 30 Jul 2015    Post subject: Why won't my YBR125 shift? Reply with quote
Yo BCF,

On the way into work this morning my YBR125 stopped shifting down into first. I had to pull away in second gear for the rest of the journey.

On the way home, I tried to see whether it was me or the bike, but it seems the problem is getting worse.

The lever "feels" different now too. Kind of "loose".

So now, no matter how I shift, I can't get it to go down a gear easily. It will shift up (sometimes), but it's very difficult to shift down, especially in the lower gears - which means I'm having to pull away in third gear - not what you want in London traffic.

5th -> 4th is ok, 4th -> 3rd is ok (sometimes), but 3rd->2nd and 2nd->1st are nearly impossible.

If I get off the bike and shift it by hand, it will eventually shift down with a bit of wiggling, but there's no way I can manipulate it like that with my foot on the move.

What's going on?

Where do I start trying to fix it?!

Edit: I've had this bike for about 5 months, it's been fine up until now.
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Brick_Top
Spanner Monkey



Joined: 20 Oct 2004
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PostPosted: 19:05 - 30 Jul 2015    Post subject: Reply with quote
You say it feels loose.

Start by inspecting the shift mechanism for play.
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arry
Super Spammer



Joined: 03 Jan 2009
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PostPosted: 19:13 - 30 Jul 2015    Post subject: Reply with quote
Has the clutch cable adjuster unwound itself?
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someguy
Borekit Bruiser



Joined: 01 Feb 2015
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PostPosted: 19:15 - 30 Jul 2015    Post subject: Reply with quote
arry wrote:
Has the clutch cable adjuster unwound itself?


Where is that? Embarassed

The nut on the clutch lever itself? If so, then no - it's tight.

Inspecting the shift mechanism itself, without taking anything apart, it feels like a spring or something is broken or weak... but I have no idea how to get at it!
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Brick_Top
Spanner Monkey



Joined: 20 Oct 2004
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PostPosted: 19:20 - 30 Jul 2015    Post subject: Reply with quote
If that was the case normally your bike would creep forwards with the clutch in, at standstill in gear.

There's one on the lever, often another by the clutch arm.
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someguy
Borekit Bruiser



Joined: 01 Feb 2015
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PostPosted: 19:51 - 30 Jul 2015    Post subject: Reply with quote
Brick_Top wrote:
If that was the case normally your bike would creep forwards with the clutch in, at standstill in gear.

There's one on the lever, often another by the clutch arm.


That doesn't happen - if I pull the clutch in, the bike just sits at a standstill without any creeping. I've just been out for a little ride... I think I know what the problem is.

I think there's a spring that returns the gear lever to the "neutral" position, which is broken or loose or weak.

I can ride around it by doing the following:

Shifting up:
Bike in gear, rolling along, clutch engaged
Apply slight downward pressure to the lever to return it to the "neutral" position whilst clutch is engaged
Clutch in, shift up, clutch out

Shifting down:
Bike in gear, rolling along, clutch engaged
Apply slight upward pressure to the lever to return it to the "neutral" position whilst clutch is engaged
Clutch in, shift down, clutch out

I guess that explains why it's easier to shift up - because gravity does the "downward pressure" for me sometimes. The opposite also makes sense - because I'm generally "shifting down after shifting down" when traffic slows (say from 4th, then to 3rd, then to 2nd), the lever stays "stuck" down after the first downshift, and needs a little gentle upward pressure to return it to its normal position before the subsequent downshift.

Does that sound right? If so, how can I get at this spring to check it/change it?
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Nobby the Bastard
Harley Gaydar



Joined: 16 Aug 2013
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PostPosted: 20:05 - 30 Jul 2015    Post subject: Reply with quote
The splines on the gear selector rod are fucked. Best bet is to try tightening the bolt on the gear selector lever (the thing you move with your foot) but the chances are you'll just snap the bolt.
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someguy
Borekit Bruiser



Joined: 01 Feb 2015
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PostPosted: 20:07 - 30 Jul 2015    Post subject: Reply with quote
Nobby the Bastard wrote:
The splines on the gear selector rod are fucked. Best bet is to try tightening the bolt on the gear selector lever (the thing you move with your foot) but the chances are you'll just snap the bolt.


Why would that cause the lever not to return to its normal position?
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Nobby the Bastard
Harley Gaydar



Joined: 16 Aug 2013
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PostPosted: 20:09 - 30 Jul 2015    Post subject: Reply with quote
aytri wrote:

Why would that cause the lever not to return to its normal position?


Because the lever is slipping round the splines. rather than rotating the rod.
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Triumph Sprint ST 1050
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someguy
Borekit Bruiser



Joined: 01 Feb 2015
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PostPosted: 20:16 - 30 Jul 2015    Post subject: Reply with quote
Nobby the Bastard wrote:
aytri wrote:

Why would that cause the lever not to return to its normal position?


Because the lever is slipping round the splines. rather than rotating the rod.


But even when the bike is switched off, the lever just sits at the very bottom of its travel. It's lost that "springiness" that used to centralise the lever in the neutral position. I'm pretty convinced it's that centralising spring, I just need to work out how to get at the little bastard!

Mañana I think, it's getting dark Thumbs Up
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Brick_Top
Spanner Monkey



Joined: 20 Oct 2004
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PostPosted: 20:18 - 30 Jul 2015    Post subject: Reply with quote
Have to agree with the above, very easy to diagnose with it in front of you.
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Nobby the Bastard
Harley Gaydar



Joined: 16 Aug 2013
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PostPosted: 20:44 - 30 Jul 2015    Post subject: Reply with quote
aytri wrote:


But even when the bike is switched off, the lever just sits at the very bottom of its travel. It's lost that "springiness" that used to centralise the lever in the neutral position. I'm pretty convinced it's that centralising spring, I just need to work out how to get at the little bastard!

Mañana I think, it's getting dark Thumbs Up


The spring is usually behind the clutch...
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Triumph Sprint ST 1050
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bikenut
World Chat Champion



Joined: 21 Nov 2011
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PostPosted: 13:19 - 31 Jul 2015    Post subject: splines Reply with quote
see cmnsl for the exploded views but check the lever position on the splines first!!
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