1977 kz1000a1 front fork rebuild

Hello,


Has anyone tried the Progressive Suspension variable rate fork springs from Redline motorcycle service out of Chicago ?
They are supposed to give a better performance over the stock springs.

redlinecycle.com/Fork%20Springs.html
 

I have used Progressive Suspension's progressive springs in a couple of bikes. They are certainly better than sagged out stockers, but I think in most cases linear rate springs are better.

I got mine directly from PS.

thank you sir ! 
What exactly are you referring to when you say “Linear Rate Springs” ?

Gdizard wrote:

thank you sir ! 
What exactly are you referring to when you say “Linear Rate Springs” ?

Hopefully the below helps
Linear springs: equal size coils and equal spacing between coil so "rate" remains constant throughout spring compression
Progressive: Unequal size or spacing of coils so "rate" increases as the spring is compressed

A liner spring absorbs energy at a constant rate per inch of compression.  The formula is:  energy = 1/2kx^2 where k is a constant for the spring in question and x is the spring displacement.  A non-linear spring absorbs energy at a variable rate depending on how far the spring has already been compressed.

Shock absorbers or forks also include fluid to dampen any spring rebound when it is compressed.  Most use oil.  Usually the manufacturer will recommend a certain oil weight for best performance, but you can use lighter of heavier weights to vary the "stiffness" of the shock.

There is a third factor, which is the weight being applied to the shock, but I won't get into that, as it normally doesn't change much unless different sized riders are using the bike.

Thank you !

Where do we find linear springs for the front forks ?

Racetech sells linear springs in different weights so you can match to your body weight and riding style.They also have cartridge valve emulators - they completely transform standard forks. I have them on several bikes. They work really well and remove fork dive. Its the best suspension upgrade you can make beyond new shocks.
racetech.com/product-search/#1

I was informed that progressive suspension does not have anything for the kz1000 today.

Hello, 

Thank you for contacting us, unfortunately we do not make any suspension for your application.

Edgar Sanchez
Customer Service Representative
13861 Rosecrans Ave, Santafe Springs Ca, 90670
P: 714.523.3000 Ext. 457 | F: 714.523.3007

Sonic lists linear springs for your KZ,

sonicsprings.com/catalog/index.php?cPath=29_305

but DoctoRot is right about the cartridge emulators.