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The Misinformant 11-04-2007 01:36 AM

640 ADV Forks
 
Has anyone changed the springs themselves on the 4860WP forks? Is there any special tools required and is it a reasonable easy job?

Have found a set of .46 WP springs out of a 06 640 to replace my .44 WP springs in my 03 640 ADV - which we think are a direct swap.

Laromonster 11-04-2007 02:17 AM

Arent the 03 forks 43mm and the 06 48 mm ?

The Misinformant 11-04-2007 03:05 AM

My owners manual says 4860, so I assume they are 48's. Let me look in the shed.

GodSilla 11-04-2007 03:17 AM

Big forks on '03
 
The '03 model got the hi-flow head and the rally 48mm forks, from memory.

The Misinformant 11-04-2007 03:26 AM

Yep books say 48mm. Can't measure them tonight as it not here. Bloody squids!

Para504 11-04-2007 04:43 AM

My '02 has 48mm (measured them to be sure) as well. The literature is notoriously wrong!

Luke 11-04-2007 02:47 PM

Quote:

Originally Posted by The Misinformant
Has anyone changed the springs themselves on the 4860WP forks? Is there any special tools required and is it a reasonable easy job?

Have found a set of .46 WP springs out of a 06 640 to replace my .44 WP springs in my 03 640 ADV - which we think are a direct swap.



It's pretty easy, there was one special tool that I needed. In order to separate the top cap from the bottoming bumper, I needed to grind down a wrench so that it was thin enought to slip onto the flats on the bumper's nut. I think it was a 15mm wrench.

Zerodog 11-05-2007 10:52 AM

Yes the 03 has 48mm forks. They are pretty much the same fork as the MX bikes. They just have a slightly shorter stroke on the cartridge. That is why they take the shorter springs. The 510mm springs will also work if you remove all the preload spacers except the thinest one. They are also the same interally as the 07 640. The .46 will most likely still be too light. But it will still be an improvement.


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