As per 495 engine manual, 495 standard clutch has 8 x 2.0 mm sinter disks plus one additional 2.5 mm sinter disk in the inner part of the hub. Then, there are 9 x 1.5 mm steel disks. Thus, total clutch pack is:
- Sinters: 8 x 2.0 + 2.5 = 18.5 mm
- Steels: 9 x 1.5 = 13.5 mm
Total: 32.0 mm
I have also been told that clutch disks for KTM's 420/495 79-84 and 350/500/550 85-87 are the same.
It seems easy and cheap to find Yamaha YZ 250 H fibres, so it could be a good alternative to the very expensive sinter plates if work properly.
If the YZ fibres are 3.5 mm, I would expect your setting is as follows:
- Fibres: 6 x 3.5 = 21.0 mm
- Steels: 6 x 1.5 = 9.0 mm
Total: 30.0 mm
This is 2.0 mm short when compared with standard clutch setting, resulting in lower spring pressure on this disk, which might get slipping.
Am I wrong?.
