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bike not shifting past gear 2

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ben_b2003
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Joined: 12 Feb 2024
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PostPosted: 09:00 - 12 Feb 2024    Post subject: bike not shifting past gear 2 Reply with quote

Hi all, hope you’re all having a good day so far. Im posting this because I’m currrbtly having problems with my Benelli BN 125 and I can’t figure out what’s wrong with it. Anyways I seem to have a problem changing gear, my bike won’t shift past gear 2 and I’ve noticed the lever when in gear is in a weird position, in gear 1 it’s to low and when you shift up to gear 2 the lever goes really high just like how it would be if you were in top gear. Also I’ve noticed some play in the part what goes inside my engine attached to my shifter which I’ll attach a video of.

(GUYS I KNOW THE BOLT ISNT ATTACHED I TOOK IT OFF WHEN TRYING TO FIX IT) the problem persists even when the shifter is attached


Last edited by ben_b2003 on 13:14 - 12 Feb 2024; edited 1 time in total
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doggone
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PostPosted: 10:33 - 12 Feb 2024    Post subject: Reply with quote

Something has come adrift probably due to wear inside by the look of it.
No easy answer it will need opening up.
Even if there was some trick to get selectors back in correct position it will likely keep doing it.
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Nobby the Bastard
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PostPosted: 10:52 - 12 Feb 2024    Post subject: Reply with quote

Your fucking gear lever isn't connected to the fucking frame of the bike. it's only conected to the selector bar/mechanism.

Thats got to be the most obvious fault in the fucking world and I'm fucking pissing myself.
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Nobby the Bastard
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PostPosted: 11:01 - 12 Feb 2024    Post subject: Reply with quote

The two arrowed bits should be bolted together.

https://www.bikechatforums.com/files/untitled_134.jpg
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doggone
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PostPosted: 11:23 - 12 Feb 2024    Post subject: Reply with quote

Oh yeah - bolt has come out I hadn't downloaded the exciting video Laughing
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that_impulse_guy
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PostPosted: 11:26 - 12 Feb 2024    Post subject: Reply with quote

these two bits should be joined together
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ben_b2003
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PostPosted: 13:15 - 12 Feb 2024    Post subject: Reply with quote

Nobby the Bastard wrote:
The two arrowed bits should be bolted together.

https://www.bikechatforums.com/files/untitled_134.jpg


yes i know i took the bolt out when trying to find a fix the problem stated in the post persists even when the lever is attached
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ben_b2003
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PostPosted: 13:18 - 12 Feb 2024    Post subject: Reply with quote

doggone wrote:
Something has come adrift probably due to wear inside by the look of it.
No easy answer it will need opening up.
Even if there was some trick to get selectors back in correct position it will likely keep doing it.


awh that doesn’t sound good so you recon it’s something serious and will require alot of money at mechanic.
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Freddyfruitba...
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PostPosted: 13:29 - 12 Feb 2024    Post subject: Reply with quote

Nobby the Bastard wrote:
Your fucking gear lever isn't connected to the fucking frame of the bike. it's only conected to the fucking selector bar/mechanism.
Thats got to be the most obvious fault in the fucking world and I'm fucking pissing myself.

FTFY
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DaddyStu
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PostPosted: 13:31 - 12 Feb 2024    Post subject: Reply with quote

Cant make it out clearly but its not just sliding around on those worn engagement pawls is it? Or tightened up in the incorrect position?

Other simple initial checks for me would be clutch cable slack, chain slack and oil level.
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ben_b2003
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PostPosted: 13:34 - 12 Feb 2024    Post subject: Reply with quote

Nobby the Bastard wrote:
Your fucking gear lever isn't connected to the fucking frame of the bike. it's only conected to the selector bar/mechanism.

Thats got to be the most obvious fault in the fucking world and I'm fucking pissing myself.


ye i ain’t that stupid mate. the purpose of the video was to show the play on the part what attaches the shifter to the engine. probably my fault for uploading a vid when the shifter wasn’t attached which had caused confusion.
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ben_b2003
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PostPosted: 13:40 - 12 Feb 2024    Post subject: Reply with quote

DaddyStu wrote:
Cant make it out clearly but its not just sliding around on those worn engagement pawls is it? Or tightened up in the incorrect position?

Other simple initial checks for me would be clutch cable slack, chain slack and oil level.


don’t think so mate cant be tightened up wrong because I remember trying to go for a ride and the problem started out of nowhere as soon as i tried to ride off. and chain slack and oil level is ok.
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Nobby the Bastard
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PostPosted: 15:53 - 12 Feb 2024    Post subject: Reply with quote

All the stuff that does the actual changing of the gear including the spring that pushes the actuator shaft back to level position isn't really affected by that very minor movement in and out.
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slowasyoulike
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PostPosted: 17:09 - 12 Feb 2024    Post subject: Reply with quote

That amount of in/out play on the gear lever shaft doesn't look like anything to worry about, C90s seem to have that much by default and I've seen plenty other gearboxes like that which functioned normally.

IME the obvious thing when people can't change gear is that they've got the drive train dragging in the road, but I see you've checked that. Plus that wouldn't account for the excess movement in the lever... have you checked the state of the splines on the lever and the shaft?
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that_impulse_guy
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PostPosted: 12:46 - 13 Feb 2024    Post subject: Reply with quote

it also easy sometime to have the lever fitted one spline too high, which tends to translate as can select first, neutral and second but no more.

it may have jumped a spline when changing up....pls check mechanical interferences first (gear lever hits on engine case when changing up)..the play you showed is nothing to worry about.
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Polarbear
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PostPosted: 13:44 - 13 Feb 2024    Post subject: Reply with quote

Take the whole linkage off the splines. Stick the bike on the center stand or axel stand. Put mole grips on the splines for the gear change. Start it up and run it through the gears. If it works it's something to do with the linkage. If it doesn't it something to do with the selectors.
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Nobby the Bastard
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PostPosted: 13:53 - 13 Feb 2024    Post subject: Reply with quote

Polarbear wrote:
Put mole grips on the splines for the gear change.


Thats a really good way of fucking up the splines.

Just unbolt the mechanism from the bottom of the shifter if you think that is at fault.
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WD Forte
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PostPosted: 15:57 - 13 Feb 2024    Post subject: Reply with quote

All I see in that vid is a bit of end float and nothing to cause concern

OK you got the lever pivot bolt removed that's ok leave it like that for now

I'd put in on the mainstand get it to neutral then rock the rear wheel
and work the linkage to see what gears I can get
(Mole grip on the first wee lever not the splines may help but you should only need moderat force)
normally I'll be able to go up and down all 5 gears but if you still cant get past 2 then issa fooked so burn it send it to thell
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Polarbear
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PostPosted: 17:04 - 13 Feb 2024    Post subject: Reply with quote

Nobby the Bastard wrote:
Polarbear wrote:
Put mole grips on the splines for the gear change.


Thats a really good way of fucking up the splines.

Just unbolt the mechanism from the bottom of the shifter if you think that is at fault.


Only if you are an incompetant neanderthal.
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sickpup
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PostPosted: 22:57 - 13 Feb 2024    Post subject: Reply with quote

Likely a broken spring on the end of the shaft.
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MCN
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PostPosted: 17:35 - 14 Feb 2024    Post subject: Reply with quote

Is the clutch releasing properly?
If there's still drive going through the clutch then gear changes will be sticky.
(It should be possible to change gear by driving through the changes without clutch. Back wheel off the ground.)
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