Did this clutch upgrade to the second of my 4TX's today (1998).
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My clutch was slipping so I replaced the clutch springs with the 1999 on type, they are heavier than the earlier type. Of course you could use heavy duty clutch springs but I like my clutch as light as possible.
If I had just changed the clutch springs I would probably have had a sticking clutch every time I left it for more than a few days.
Clutch springs are genuine Yamaha part: 90501-237L0 (6 off, £21.24 inc delivery from Fowlers, Bristol.)
Steel clutch plates are from Wemoto, part number 190240. They are listed as "Clutch steel plate single" (8 off, £43.18 inc delivery) and have small dimples on the surface unlike the originals which are completely smooth
You will also need a clutch cover gasket too. Wemoto do them at £8.11)
You shouldn't need to drain the oil to do this job. Although I do have a Hagon shock which makes it lean over on the stand a little more.
Obviously if you have a post 1999 4TX you should already have the springs fitted.
Also, check the clutch friction plates for wear before reassembly, they should be 2.9mm thick minimum.
Edited by paultdm850, 15 April 2017 - 02:52 pm.