XT660Z - Clutch Slipping

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Andy660

Grey Hound
Joined
May 28, 2007
Messages
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Location
Grantham.Uk
Bike
Yamaha XT 660 Z
Please take note , I am a qualifed aircraft fitter ( Helicopters)
Part 1

I searched the  www.xt660.com site and found some problems there too, different to mine though.

Just after my 30 000 km service,I noted that when in 3rd gear and accelerating hard , the clutch slips .so
I emailed the dealer to see if there was any Technical reports from the factory in that regard, the answer was no,your clutch must be going.You need a new clutch!

Sorry , I didnt accept that , so I removed the side cover and carefully removed all the friction and stator plates,
I measured all the friction plates in accordance with the manual( There are 3 different types of friction plates that make up the clutch , just by the way)

All were still in spec.

Right now for the clutch springs.
55.2 mm to 52 mm.

Well they range between 54 to 54,4 mm.

So I have added 1mm shim washers on the top of the springs , just under the attachment screws.

Anyway , all assembled the cluch feels much better than before.
Doing a 500km ride in the mountains tomorrow , so we shall see !!

:ricky: :ricky: :ricky:

Well , we did the 450 km trip through the mountains today(dirt).
And the clutch worked like a dream.

So , I want a new clutch kit from the agents .The bike is still under guarantee for another year.
The clutch springs cant loose 1,3mm or so of length in 30 000km ?
And although the plates aren't worn beyond there limits , they have worn more than they should have.
Had the springs been of better quality or the correct length the clutch wouldnt have slipped in the first place ?

Part 2

So the 1mm shims did the trick, the clutch slipping is sorted,no more slippage.
On emailing my findings to the agents , there reply was that they are`nt happy to do the claim , as I removed the clutch myself.

However , I had emailed them first and asked if there had been any special technical instructions with regards the clutch , the answer was no,you need to buy a new clutch.

So now we wait and see what they decide !!!
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