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Suspicious Screech - Transmission or Camshaft?

MotoGuzzi12

MotoGuzzi12

Tuned and Synch'ed
Joined
Jul 6, 2014
Messages
41
Location
San Francisco, CA
I'm back!

Not sure what I got going on right now...

I was having this issue towards the end of last season and now that I've finished putting my front end back together I'd like to revisit this loud noise before it become a more serious issue.

I'm hearing a loud screech as I release the clutch (mostly neutral to first but also other gears).

I'm hoping I just need to replace the trans oil or some other fluid but let me know if anyone has an idea as to what would cause this or if you've remedied this problem before.

Any help is greatly appreciated!

Thanks
 
Want to make sure I understand correctly:

The noise happens when you pull the clutch lever in & are holding it in?
OR
The noise happens when you are releasing the clutch lever?

The first thought that comes to mind is the clutch release bearing which would normally make a screech (if bad) when you pull in the clutch lever & are then putting pressure on the bearing.

If the transmission shifts fine & there are no shimmys or shakes or noises going down the road I would be more inclined to say clutch release bearing.
 
Trout said:
Want to make sure I understand correctly:

The noise happens when you pull the clutch lever in & are holding it in?
OR
The noise happens when you are releasing the clutch lever?

The first thought that comes to mind is the clutch release bearing which would normally make a screech (if bad) when you pull in the clutch lever & are then putting pressure on the bearing.

If the transmission shifts fine & there are no shimmys or shakes or noises going down the road I would be more inclined to say clutch release bearing.
Click to expand...
The noise occurs as the clutch lever is released.
 
The throw out bearing would make noise when you squeeze the clutch, not when you release. You may have a mis-alignment of the clutch plate to the input shaft of the gearbox. The screech may be the clutch plate trying to center. Also possible the clutch plate is just making noise on engagement. If there is a glaze, there may be some slippage that makes the noise. If the bike has the original clutch plate, it is quite old at this point.

As to replacing the throw out bearing, relatively simple once the swing arm is removed. However I don't think that is your issue.
 
What John said: 100%

The choice is:
1) Tear it down before serious damage which requires trans removal. Not sure if frame can be "crabbed" so engine does not have to come out. Use the search box & put in Crab.
2) Continue to ride until it becomes worse then tear it down.

If you continue to ride & the mis-alignment is serious then you may be taking a chance on damage to the front bearing & seal on the trans & a more extensive repair to the clutch & clutch hub.

I hate to admit this but depending on how loud the noise is & if there was a "shudder" present when starting out in first I would probably continue to ride it for awhile. I have a habit of putting things off & then when I do fix it I replace everything "while I'm in there".
 
Thank you all - I had the clutch plate replace just over a year ago so that's a bit disheartening.

I had that done at my local shop so maybe I'll just take it back there to see what my mechanic thinks.
 
If the bike has been sitting for awhile (especially if there is dampness) it is possible that some rust has formed on the clutch spline causing the mis-alignment John mentioned.

Like I said I would probably ride it easy for a bit & maybe work that clutch a little. If it starts getting worse then park it & fix it.
 
I had a similar thing. It sounded like this:


The problem was that a mechanic (I don't use his service anymore) did not fill enough oil in the gearbox. I added extra gearbox oil 1000 ml (not 900 ml like the manual says) and the bad noise disappeared, but a mild whine remains.
 
Auris said:
I had a similar thing. It sounded like this:


The problem was that a mechanic (I don't use his service anymore) did not fill enough oil in the gearbox. I added extra gearbox oil 1000 ml (not 900 ml like the manual says) and the bad noise disappeared, but a mild whine remains.
Click to expand...


Thanks Auris - this looks/sounds like it may be the same issue.

I'll post a video sometime this week...
 
MotoGuzzi12 said:
Thanks Auris - this looks/sounds like it may be the same issue.

I'll post a video sometime this week...
Click to expand...

I - and many others - had this issue.

It's a design fault. The fix is a replacement clutch actuator rod. Most have this happen within, say 12,000kms. Mine happened just before it's 2 year warrentee ran out.
 
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