does anyone know what would cuase the extra vibration im getting under load around 3500- 4000rpm it really shakes the front fairing, any ideas would be good.

They all vibrate worst around that engine speed, particularly with a full tank of juice. If it is particularly bad the first place I'd check would be the front engine mounting bolts are torqued correctly. If too tight/too loose they will cause excessive vibes, particularly if engine bars or bash plate have been fitted, and especially if non-Yamaha bolts have been used which can be a bit "stretchy".

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Thats very interesting... I have bash plate/engine bars & non yam bolts
And real bad handle bar vibes...
Do you know what the torque setting are ?

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Harley Davidson..
The easyest way to turn gasoline into noise with out the side efect of horse power...

2004-2006 73Nm (R & X)
2007- 65Nm (R, X & Z)

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Thanks i will have a look at that, i know they vibe a bit with a full tank this just seems alot more then normal,also i dont run any crash bars.

I'm having a serious vibration problem and I think it's related with the recent applied Touratech engine guard. I'll have to check if the bolts are OK, because the vibes are killing me.

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2010 White XT660Z.

I have cut the vibes on the XTR bars by a good 50%....
vibanators..
heavy bar end weights..
Anti vibe grips...
filled the lower section of the bars with sand up to
the 2nd bend.. hit a cork down to hold it there & leave
enough room for the vibenators...

__________________
Harley Davidson..
The easyest way to turn gasoline into noise with out the side efect of horse power...

I did notice a vibe increase when removing the bar weights a couple of years ago, but I considered it to be acceptable at the time. But now, it's just becoming uncomfortable. Since the next service is around the corner, I'll check with the dealer what can be done.

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2010 White XT660Z.

check the to p cockpit retaining bolt behind the screen mine came loose and it vibrated like feck

Have you recently adjusted the CO levels or otherwise affected the richness of your air/fuel ratio (or even dirty air filter?).

I mention this because I asked my mechanic to try to get rid of the jerky throttle issue and he played with the CO level and made it very rich (put it to 30) - which helped with the throttle, but I noticed that the vibrations were much worse. I remember (when new) being able to comfortably hold 70km in 3rd gear (XT660X), and after he changed it, it felt awful - harsh anywhere above 60km in 3rd.

My handlebars and fairing would visibly shake (you could feel each detonation) at mid revs under acceleration - I couldn't get anywhere near rev ceiling.

I adjusted CO back (to 3) plus put stage 1/2 filters in (so much more air/leaner) and it is much better. The engine revs much better now - I can hold 70km again in 3rd. I fitted Kevs fuel mix resistor/gizmo but have wound it back (from Kevs recommended settings) to be leaner.

I find (on my) engine, it revs much more freely on a leaner setting.

I should say that I have also fitted Kevs other gizmo (sorry, it's been a few months - bad memory) which fixes the jerky throttle - whether that makes things richer all round (and I'm not running as lean as I think), I don't know. Basically I have leaned it off to where (I feel) it spins freely - the exhaust colour is still good so I am confident I am not running it too lean.

I got so conscious of the vibes, that I could tell the difference between fuel qualities (the vibes got worse on higher octane fuel). I've just set it for 98 octane and only use that now (worried that it will be way too lean on 90 octane).

Sorry for the long reply, but it was a very frustrating issue, and I was soo happy when I was able to resolve it. Hope it helps.