Standard Spring Rate on Gen 1 Forks??

[Capt]

I know its been covered before, this damn IPAD is no good for my aging eyes.
Anyone tell what they were as standard PLS?
Ta!

[dekker555]

They don't have a single rating as they are dual rate. I've just changed mine (front and rear) for single rate springs to suit my weight (forks serviced and rear damper re-gassed too) and it's made a considerable improvement to an 8,000 m. gen 1.

[Falcon 269]

From the Yamaha Workshop Manual:

Spring rate (K1)                  8.1 N/mm (0.83 kg/mm)
Spring rate (K2)                11.8 N/mm (1.2 kg/mm)
Spring stroke (K1)                  0 to 55 mm
Spring stroke (K2)                55 to140 mm

Total fork travel is 140mm.

Essentially, stock dual-rate springs are too soft in the first part of their travel but too stiff in the latter part. 

[seangee]

Changed mine for linear rate springs and the difference is amazing. Did nothing else to the forks other than change the oil (and of course back off the preload which I had maxxed out) and its more than good enough for normal road use.