Jumping out of gear?

[Deleted account 200502001]

No idea if this is a clutch/gearbox issue or not, but twice now on separate days whilst accelerating my 09 GSA through either 3rd or 4th gear theres been a sudden jolt, accompanied by the revs suddenly increasing momentarily. This only lasts for about one/two seconds, then all returns to normal and I can continue accelerating. This hasn't been when changing gear, but when accelerating about 1/3rd of the way through a gear. It feels like its jumped out of gear, but I've no idea if thats the case?

Any ideas please?

 

[RedRick Esq.]

Steve
It seems unlikely that it would jump out and then back into gear and certainly not without a loud and noticeable clunk/bang
sounds more like clutch slip

 

[Norfolk Tiger]

I'd agree regarding clutch slip,I think I'm correct in saying that as the clutch wears the fluid level in the reservoir rises.

 

[Deleted account 200502001]

True, I really dont think it can be the gear. I'll have a looksie at the clutch reservoir.

 

[Bendy toy]

Check the clutch lever is not catching the hand guard.
Clutch fluid rises as the clutch wears so can lead to clutch slip if the reservoir is above the max level mark.

 

[snaponphil]

No idea if this is a clutch/gearbox issue or not, but twice now on separate days whilst accelerating my 09 GSA through either 3rd or 4th gear theres been a sudden jolt, accompanied by the revs suddenly increasing momentarily. This only lasts for about one/two seconds, then all returns to normal and I can continue accelerating. This hasn't been when changing gear, but when accelerating about 1/3rd of the way through a gear. It feels like its jumped out of gear, but I've no idea if thats the case?


Any ideas please?

same problem as my 1 year old GSA had last year, shaft sticking, thoroughly clean & lubricate it, problem solved till it started sticking again, a regular maintenance item that I would have sworn wasn't the shaft or linkage..
It's not allowing the gears to fully engage occasionally & engine revs up then clinks back into gear..
Shaft needs to be TOTALLY free..
Good luck..

 

[snaponphil]

http://www.ukgser.com/forums/showthread.php/396294-Gear-change-problems-when-warm

See other thread..

 

[AustinW]

This happens occasionally on my 2011 GSA too, usually, but not always due to a slightly sloppy upwards gear change from me and usually results in the bike ending up back in the gear I just changed from, so not clutch, but no crunches or mechanical sounds. I had been blaming myself, so good tip on the gear change shaft. I will be having a look.

 

[Martyn H]

This happens occasionally on my 2011 GSA too, usually, but not always due to a slightly sloppy upwards gear change from me and usually results in the bike ending up back in the gear I just changed from, so not clutch, but no crunches or mechanical sounds. I had been blaming myself, so good tip on the gear change shaft. I will be having a look.

Wot he said. Have had this (very occasionally) on a number of 1200's. Certainly wakes you up. I agree about it happening when changing gear rather "gently".

 

[Deleted account 200502001]

My problem doesn't happen when changing gears, it happens part way through accelerating through the gears range.

 

[AustinW]

My problem doesn't happen when changing gears, it happens part way through accelerating through the gears range.

I think that's what I meant actually, but follows soon (seconds) after a sloppy gear change, and its also very occasional - like once in 1,000miles or so.

 

[snaponphil]

My problem doesn't happen when changing gears, it happens part way through accelerating through the gears range.

Guaranteed shaft is at fault, needs to be totally free, even if you think it is it won't be..
When shaft starts to 'stick' the gears don't engage 100% & can take a few seconds (10 or more) to disengage gear, this certainly wakes you up..
Enjoy.. Cheap repair but time consuming to get it right..

 

[flatdog]

99% Bears shaft is mucky, very mucky.

 

[Martyn H]

My problem doesn't happen when changing gears, it happens part way through accelerating through the gears range.

Yep - just as you're accelerating away in the higher gear you've just selected. Maybe a couple of seconds after you've selected the next gear ?

 

[Bendy toy]

The shift lever shaft runs in polymer bearing bushes. Dirt can make them bind but eventually they'll wear loose. Take out the shaft, clean and reassemble. If they are worn, new bushes are not costly.

 

[Deleted account 200502001]

Didn't get around to sorting this out as it didn't happen again, until yesterday

 

[Deleted account 200502001]

Is it easy to remove the shaft to clean?

 

[Bendy toy]

Its as simple as it looks. Take the inner clamp screw right out as it sits in a groove in the shaft end. There should be no need to remove the gear lever from its end of the shaft. The shaft slides out of the frame. If its jammed with dirt, might need careful hammer/drifting from the other side of the bike.

 

[Deleted account 200502001]

Its as simple as it looks. Take the inner clamp screw right out as it sits in a groove in the shaft end. There should be no need to remove the gear lever from its end of the shaft. The shaft slides out of the frame. If its jammed with dirt, might need careful hammer/drifting from the other side of the bike.

So leave the pinch bolt alone, and remove the central bolt thing with an allen key?

 

[Roymondo]

As it's a GSA, a simpler "fix" may be to adjust the position of the gear pedal rubber - i.e. to lower it a bit so it contacts the top surface of your boot a bit earlier...