Clutch noise - Curvy.

[andrewsmith]

Evening Org

Well my clutch is now doing my head in as it rattling like mad.
Its silent when the clutch is pulled in and is clunking when off load.

Its a 2000 Curvy at with 26.5k on. Any guess on whats causing it?

[Matt-EUC]

It's shagged?

Strip the entire engine. Find the CBT unit and plug it in to your phone with a GS cable. If it reads purple your clutch is knackered. Remove the CBR unit and disconnect the reg/rec. Put it all back together and use the parts left over to construct an ISPN and call your local garage and tell them you need a left handed screwdriver to recondition your clutch cable with ACF50.

[andrewsmith]

It's shagged?

Strip the entire engine. Find the CBT unit and plug it in to your phone with a GS cable. If it reads purple your clutch is knackered. Remove the CBR unit and disconnect the reg/rec. Put it all back together and use the parts left over to construct an ISPN and call your local garage and tell them you need a left handed screwdriver to recondition your clutch cable with ACF50.

Matt thats your bike not mine!!!

[Matt-EUC]

I have knackered (probably) valves, bore and crank. My clutch is fine.

[andrewsmith]

Have a look here then http://forums.sv650.org/showpost.php?p=2284185&postcount=3

[Matt-EUC]

I was hoping for more of a reaction to the gibberish I posted. I spent a long time trying to come up with unintelligible gibberish for your benefit.

[Bibio]

does it sound like a dry clutch ducati?

[andrewsmith]

does it sound like a dry clutch ducati?

Not that bad, but got a ducati'istic sound

[Red Herring]

When you say "clunking" that sounds more like a gearbox issue rather than clutch. If you put the bike on a paddock stand and let the clutch out with the bike in gear does it sound the same? (If you haven't got a paddock stand you can do it on the side stand, only you will need to disconnect the kill switch and be careful not to slip!)

[Bibio]

check the basket nut and bearing.

[andrewsmith]

When you say "clunking" that sounds more like a gearbox issue rather than clutch. If you put the bike on a paddock stand and let the clutch out with the bike in gear does it sound the same? (If you haven't got a paddock stand you can do it on the side stand, only you will need to disconnect the kill switch and be careful not to slip!)

Its when it in neutral not in gear. Its quite smooth between gears and okay going down

[wideguy]

After long use, the aluminum fingers on the clutch basket wear where the steel tabs on the clutch plates hit them. This is a possibility. You've only got to pull off the clutch cover to look.

[Red Herring]

Just another thought, have you had to suddenly adjust the clutch recently?

[andrewsmith]

check the basket nut and bearing.

Just another thought, have you had to suddenly adjust the clutch recently?

Just a normal retweak after the chain was tightened. The adjuster on my cable is not a good guide as it vibrates in and out

[Red Herring]

check the basket nut and bearing.

That's what I was thinking, but if the nut works lose and the basket moves out towards the cover and the first thing you notice is the clutch lever goes slack.

I'm wondering if it's a lay shaft bearing, hence the gearbox rattles when not under load?

If it was worn fingers on the basket it rattles when the clutch is pulled in and the plates are free to move, not when it is released and the plates are compressed together.

[Bibio]

the one at the lever end?

[Bibio]

That's what I was thinking, but if the nut works lose and the basket moves out towards the cover and the first thing you notice is the clutch lever goes slack.

I'm wondering if it's a lay shaft bearing, hence the gearbox rattles when not under load?

If it was worn fingers on the basket it rattles when the clutch is pulled in and the plates are free to move, not when it is released and the plates are compressed together.

good thinking. i know he has crashed a few times so i wonder if he has given the gear lever a good whack..

[andrewsmith]

the one at the lever end?

Yes
Bottom end is once a year

sent from the shredded wheat factory

[Bibio]

well if the adjuster has been rattling then i would guess that it's every ride you are playing with it so you would not know if the bearing or nut is loose/burgred.

take the cable off and then the adjuster and give the housing a little squeeze with pliers then put all back together with a bit of non set glue (the stuff you get cards stuck to paper at petrol stations,, hint hint)

[andrewsmith]

Biblo you've lost me here!
Which bearing you on about?

Yes the bike has took several offs all on the same side

sent from the shredded wheat factory

[Bibio]

it's the thrust bearing under the spring housing. if that went though you would know about it as it would rattle like a good one and have loads of play in the lever.

[Red Herring]

As a general guide you tend to notice clutch issues when you pull the lever in. This compresses the clutch springs and releases the pressure on the plates, allowing them to "rattle" and the inner and outer baskets to rotate in relation to each other. It also puts pressure on the release bearing. If you have a broken plate, or a knackered bearing, you will hear and feel it.

If on the other hand it is quiet when the clutch is pulled in, and the noise is when you release it then this tends to suggest gearbox as the inner basket is now turning and this is connected to the input shaft, and even with the gearbox in neutral all the various gears will be spinning on their shafts.

[andrewsmith]

So shredded gearbox RH?

sent from the shredded wheat factory

[Red Herring]

I'd want to hear this rattle/clunk before making that call. Have you changed the oil recently, was there anything nasty in there? My Hornet gearbox with over 50k hard miles on it makes quite a whirl in neutral but I wouldn't describe it as a rattle or knock.
I take it this noise is when stationary so we can eliminate chain etc...?

[andrewsmith]

Here is a video of the noise. Its only at idle

http://youtu.be/eJ0umEZJQa4

eJ0umEZJQa4

[Bibio]

i don't hear anything unusual. if anything i hear a slight CCT/tappet noise.

[rapidgaz]

I can hear the slight noise change, but my 2500 miles old sv does it and most cars do it. Sounds pretty normal to me.

[andrewsmith]

i don't hear anything unusual. if anything i hear a slight CCT/tappet noise.

Well thats due again next year!
And the rear CCT will be getting changed at some point