Fork Rebuild

Noggin · Traffic Copper Joined: 27 Feb 2004 Karma :

Hi all,

I'm in the process of stripping and cleaning the brakes on my R6, I'm just waiting on the new seals to arrive so I can reassemble them. Whilst doing this I noticed that the LHS (as on bike) fork seal appears to have started leaking.

As I've already attempted the brakes without any problems I think I'm going to tackle rebuilding both forks. The main question I have is about replacing the fork springs. What difference would I see (if any) by replacing the standard yamaha items with Hyperpro/Hagon/K-tech/Ohlins springs? And what sort of cost are they going to be? Also, what's the difference between progressive springs and non-progressive?

Thanks Guys

Craig G(Noggin)
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Current bike: kawasaki zx12r 2002
Track bike: yamaha r6 1998
Old Bike: honda NSR 125 1998

Chriss · World Chat Champion Joined: 07 May 2005 Karma :

What difference would I see (if any) by replacing the standard yamaha items with Hyperpro/Hagon/K-tech/Ohlins springs? And what sort of cost are they going to be? Also, what's the difference between progressive springs and non-progressive?

It's difficult to describe handling, as it can't realisticly be measured. I'd go for Ohlins springs, and my local place sells them for about £100 a pair. Progressive the spring gets stiffer the more you push it, and non-progressive, the spring keeps the same tension regardless how much you push it. Smile

HTH.
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TheShaggyDA: I've got 3 or 4 pairs that predate my wife, so at least 11.5 years old.

fuzz · World Chat Champion Joined: 24 Mar 2004 Karma :

Progressive springs - good for road use, more plush ride as it's softer over small travel.
Linear springs - good for track use as the spring rate is constant

The main thing with replacing fork springs is to match them with your weight. Standard springs are obviously set for general joe public, but the advantage of using Harris/Ohlins etc is you can custmise it to you personally.

https://www.sonicsprings.com/catalog/calculate_spring_rate.php
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https://www.bikepics.com/members/fuzzbcf/
Bikes: '99 NSR125R, '00 SV650S, K1 GSX-R600, '97 CB500, K3 SV1000S, '16 VFR800