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Discussion Starter #1
Not sure if it's just me but my bike seems to be vibrating more and more each ride, I can now feel vibes in the saddle and foot pegs but not any in the bars, is this normal? I remember the bike been mega smooth but I think it was with the slip on exhaust which I've now sold. The vibes start at around 4500 rpm up to around 6000 ish it's not mental vibes but defo noticeable, anybody else experience this sensation whilst riding?
 

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My Yamaha FZ1 - used to be very sensitive to chain tightness - i used to have to run it tighter than normal to stop snap and vibration - my two Ducatis - dont seem to mind - so I run them a bit looser - but maybe you should check

When mine was delivered - mid way on bottom run I had 40mm slack from pushing up and pushing down with good finger force (this was measured on centre line of chain) so I have used this number and it works fine - worth checking.
 

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If the vibes stop when you pull on the clutch, it may come from the chain. When you pull the clutch, the chain is no more in constraint, so...

Yes, also, check your tyre wear : you should find on the side of the tyre "TWI" written (Tyre Wear Indicator). At this place, the tyre has got a molding at the bottom of the tyre grooves. If this molding is at the same level than the surface of the tyre groove, your tyre is good for change.
 

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Discussion Starter #8
My chain is on the slack side so will try tighten to required 29mm and stick a new rear tyre on and hope for the best.
 

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Hmmm I was wondering the same recently, my bike felt more vibey in the pegs but it has two newish tyres so not that. It is however coming up to it's 7500 service, will be interesting to see if it's any better afterwards!
 

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Please let me know if anything changes, the vibes are beginning to annoy and putting me off my ride. I do ride quite hard but not mental and do pull the odd amateur clutch wheelie but she is fully serviced and well cared for. I've checked all the usual suspects (engine mounts etc) but nothing was out of spec.
Will do, I hope to book it in for some time in June. I only tend get the vibes on the pegs at higher speeds on a straight run, I've not really noticed them at other times - but I'm sure they weren't that bad to start. Anyway will keep you posted.
 

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Discussion Starter #13
I lifted my tank up and the tank breather must of been trapped as it let out a large hiss and a pipe full of water came out! The bike now runs back to normal??? Could a trapped breather cause vibration/rough running?
 

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As the fuel pump tries to pump fuel to the injectors it will cause a vacuum in the tank if the breather is blocked.

That might cause a reduction in fuel pressure which in turn will affect the engine running, and probably it's smoothness. Sort of like a fuel blockage.
 
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Discussion Starter #15
Just been for a ride today and it's still there?? I noticed the vibes started when the clutch wasn't disengaging properly when I'd left the bike for a week, so my next question is could a clutch cause vibration at 4000+ rpm?
When riding at these revs if I touch the passenger side of the saddle it feels really vibey.:confused3:
 

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If one of the friction materials has come unstuck from a plate, or broken, it would cause unbalance.

It would throw the whole clutch hub out of balance.
 
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