rattle/tappy noise from the engine

[pompousporcup...]

Today my Thundercat developed a noise whilst the engine is running. like a frantic tapping. It goes almost entirely when i pull the clutch in.
Ive read about 'clutch rattle' but what exactly is that on these bikes and how bad is it? Can it be fixed at all?
It wasnt doing it at all yesterday or this morning.. its fairly fking loud as i can hear it with earplugs in when stopped at the lights. I also have a loud exhaust and i can hear it over that too. Otherwise the bike runs fine.. it did feel a wee down on response but it was good n hot today.


The bike is my daily ride and i spend an hour each way on the motorway so it needs to be ultimately reliable. It gets regular oil + filter changes etc

If its not one bike its the other

[pompousporcup...]

https://www.youtube.com/watch?v=zUiuO69Z_qw&feature=youtu.be

video.

Yes, i know the clutch is on the right but i could hear it better on the left as the exhaust wasnt drowning it out

[weasley]

Maybe check the manifold gaskets? I'm at a restaurant right now listening on my phone but I couldn't hear a difference with the clutch in or out.
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Yamaha XJ600 | Yamaha YZF600R Thundercat | KTM 990 SMT | BMW F900XR TE

[P.]

Me either... If I had to say it was something...it'd be the headers. I've seen 3 thunder ATS, mine included which sounded tappy and was gaskets.

[drbaig]

Can't tell.

I concur the two above. Ticking on mine was caused by leaky headers. Gaskets were fubar.

Exhaust studs are a bastard though. Two of mine snapped.
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yzf 600r

[pompousporcup...]

just checked the header nuts and they're all good n tight. checked the plugs and they are tight too. I've had a blow from a header gasket before and it sounded different.. i might change them this weekend just to rule it out but i dont think its that.. why would the clutch affect headers blowing?

(there is definitely a difference on the vid with the clutch in. the sound is less..hollow... when the clutch is in.. it is subtle on the vid but glaringly obvious to me)

I cant say i've ever noticed that sound before and ive done a fair few miles on it. It has just about to tick over 42k

[pompousporcup...]

[temeluchus]

The "fingers" on the clutch basket could be worn, that would make it rattle more loudly than usual.
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Some shite cruiser. Now with guns and FREEDOM!

[pompousporcup...]

righty ho: It gets louder as the engine warms up.. i couldn't hear it this morning when i set off but once i got to work the problem was there.

weirdly, there may possibly be two issues here and this noise is nothing to worry about.. about 10 mins in (as im joining the m4 from swindon) i give it some beans and it starts to surge cue a very hairy moment or two joining the motorway.. then it took off like a scalded cat

i cruised around 80 in top gear and then it started doing it again, losing ALL power. i coasted onto the shoulder with the throttle open to try keep it running.. once i'd slow down to around 50mph i could keep it at a steady throttle and it worked again Then.. like magic, it worked fantastically all the way to work and sounded crisp and felt responsive.
WTF is going on?

My thoughts are:

Bad fuel.. i fill up almost every day
Bad fuel pump..i dont hear the clicky retarded dolphin noise any more

[Ayup_Mi-Duck]

[skatefreak]

Your clutch isn't ticking... it's Rumbling and can definitely be heard in the video (maybe not on mobile phone speakers tho ).

But yes, thoughts, have you changed the oil lately?
When I put my commuter cbr 600 on the track and put some 'proper oil' in it the clutch instantly started 'rumbling' like that. Deff had more bite and overall was not actually a problem.

Does the clutch slip at peak power at all (giving all the berries through to the redline)?

Carb problems seem more important either way

[pompousporcup...]

[pompousporcup...]

[pompousporcup...]

There was crease in the fuel pipe from the filter to the pump which isn't obvious until the tank was off. It must have been like that for months now but only become a problem now potentially as the hose deteriorated with heat etc. Straightened it out and it didn't miss a beat on the way home
Still makes the rumbly noise but I can live with that for now

Thanks for the help all