R6 rear shock on the FZS600

[mobile mouse]

The spacer came with the shock already fitted. Sorry to be no help.

[nedworthy]

Thought I would give people a  :lol  and add to this topic. Got all the upgrade parts but not the spacer - quotes for this ranged from £87 - £165 for a basic bit of drilling an aluminium billet! So got a billet from evilbay (£4) used a hole saw to cut centre and axle grinder and file to reduce diameter and shape a lip to fit preload adjuster.
What a unsightly monster it is but .....works perfectly 

[red98]

nice work NEDWORTHY...a big thumbs up for effort  :thumbup :thumbup :thumbup

[riddleofsteel]

Anyone happen to have any suitable dog bones for sale?
Or know a good source for some?
Cheers

[mobile mouse]

I keep looking here for the 130mm option, but they have other sizes all for £19.95


https://www.ebay.co.uk/itm/Motorcycle-Su...1920664262

[bwizz]

I'm going to swap mine for a thou one when I get the chance, I've got the shock I just need the time.

I have had a thou one on my 600" with 600 spring," for some 6 years now It works a treat and is totally forgettable. most inexpensive mod I ever did Think the details are one of my old posts!
I have an R6 shox on my thou. Its good albeit slightly soft ,but not as good as the former

[Anto]

Not sure if this thread is still active but I'm now trying my own hand at this mod and having some difficulties with the spring inner and outer diameter. I ordered a 2.25"ID , 6" Length faulkner's spring in order to fit it onto the 2C0 shock, and after receiving it, both the inner and outer diameter are much bigger than that of the stock R6 2C0 spring, to the point that the spacer I had made going off the stock R6 spring measurements wobbles around in the spring A LOT, and I don't feel like it would be smart to mount that on the bike

When making the spacer, would it be smart to make the inner diameter AS WELL AS the outer diameter bigger, in order to allow absolutely no wiggle room on the bike?
Also, would it be smart to manufacture a spacer for the top of the shock as well, in order to keep the spring centered at both the top and bottom of the shock?

Photos of what I'm referring to below.

Thanks in advance for any help.

[kebab19]

Antonio,
Only my opinion, but after using two R6 shocks for thousands of miles (using the slightlly oversized Faulkners springs), neither spring moved sideways by any noticeable amount. Of course, they have to be mounted centrally and have the appropriate amount of preload on the spring at all times.
There's been quite a few conversions floating around and to date I'm not aware of anyone mentioning this as being an issue. If however you still don't feel it safe enough then make a customised spacer (or two for both ends) to give you peace of mind.

[returning rider]

Considering this myself are the parts available anywhere ie top hat bushes, spring spacer dog bones etc?

Also the Fazer 600 spring is 823lbs, does the R6 shock offer resistance via the gas? the quoted spring values are less than 823lbs?

I am a big lump and according to spring calculators I need 1.0KG/mm fork springs, so i expected to have to increase the spring rate at the rear?

Sorry if i am asking silly questions.

[kebab19]

Considering this myself are the parts available anywhere ie top hat bushes, spring spacer dog bones etc?

Also the Fazer 600 spring is 823lbs, does the R6 shock offer resistance via the gas? the quoted spring values are less than 823lbs?

I am a big lump and according to spring calculators I need 1.0KG/mm fork springs, so i expected to have to increase the spring rate at the rear?

Sorry if i am asking silly questions.

Hello.
Not at all, the only silly question is one that isn't asked.
The conversion parts are not commonly available, apart from the dogbones. I could contact my metalwork fabricator if you need the parts, but (like everything in 2025) nothing's as cheap as it used to be...
A direct comparison with the standard shock's setup is fairly pointless, I initially found that despite the vast difference in spring rates, the standard 525lb R6 shock spring felt almost the equivalent of the OEM shock setup, which was a real surprise at the time. 
I've converted about 30+ shocks and from memory, the largest spring rate variant was for an 18-20 stone rider setup. If you're bigger than that, then we're into unknown territory, but the internals would probably need revalved so no longer a cost-effective option.

[returning rider]

Considering this myself are the parts available anywhere ie top hat bushes, spring spacer dog bones etc?

Also the Fazer 600 spring is 823lbs, does the R6 shock offer resistance via the gas? the quoted spring values are less than 823lbs?

I am a big lump and according to spring calculators I need 1.0KG/mm fork springs, so i expected to have to increase the spring rate at the rear?

Sorry if i am asking silly questions.

Hello.
Not at all, the only silly question is one that isn't asked.
The conversion parts are not commonly available, apart from the dogbones. I could contact my metalwork fabricator if you need the parts, but (like everything in 2025) nothing's as cheap as it used to be...
A direct comparison with the standard shock's setup is fairly pointless, I initially found that despite the vast difference in spring rates, the standard 525lb R6 shock spring felt almost the equivalent of the OEM shock setup, which was a real surprise at the time. 
I've converted about 30+ shocks and from memory, the largest spring rate variant was for an 18-20 stone rider setup. If you're bigger than that, then we're into unknown territory, but the internals would probably need revalved so no longer a cost-effective option.

Hi thanks for the reply I am an engineer to trade so worst case I can make them up if I can get access to a lathe again.
I fall into the 18-20 stone when kitted up as said I am looking to speck the front to 1.0 kg/mm springs the OEM is too soft for me. 
Can I ask what spring you found best for the 18-20 then? 

Thanks for all your great advice on here I know the Fazers are old girls now but still like to keep it going and keep it in a useable condition the suspension is 24 years old it's done it's time lol

[kebab19]

Hi, sorry haven't looked at this thread for a while.
Have lost most of my old PMs in the recent purge. But going from all the others I've previously done, I'd estimate that depending on preferred level of comfort, you'd need a 700lbs/inch (120 N/mm) or 725lbs/inch (125 N/mm) spring.

If you're after a 120 N/mm spring, there's a guy on ebay currently selling a load of K-Tech ones that fit - I assume he's either a trackday addict or a racer! Search for 'Ktech Shock Springs 55-155 Multiple Rates Available' or type eBay item number: 186726839773

[returning rider]

Cheers I went for a Faulkner's spring 750lbs I have a newer model R6 (2017 onwards)shock and it fits great did not need to fit a spacer the new spring was same length as OEM. Just got top hat bushes via a very helpful gent on Facebook. Waiting on dog bones and will give this a go. Currently doing my son's SV650 and having found the linkage totally seized I fear the worst for the old fazer

[kebab19]

Have only converted one 2017 onwards shock for a Foccer and he was very happy with it. Hope that spring rate works well for you!

[returning rider]

Have only converted one 2017 onwards shock for a Foccer and he was very happy with it.  Hope that spring rate works well for you!

Thanks not had chance to fit it yet got all the bits Faulkner spring for my fat ass weight and top hat bushes for the top mount.

Shock looks a very nice piece of kit and too good for the old fazer should make big difference.

Just finishing doing my sons SV650 front end have fitted linear springs and YSS PD valve (emulators) not tried it as still painting the lowers, but if this works as expected will do the same to fazer.

[kebab19]

Have only converted one 2017 onwards shock for a Foccer and he was very happy with it.  Hope that spring rate works well for you!

Thanks not had chance to fit it yet got all the bits Faulkner spring for my fat ass weight and top hat bushes for the top mount.
Shock looks a very nice piece of kit and too good for the old fazer should make big difference.

Just finishing doing my sons SV650 front end have fitted linear springs and YSS PD valve (emulators) not tried it as still painting the lowers, but if this works as expected will do the same to fazer.

Ah yes, cartridge emulators for the damper rod forks.
Carried this out out my 600 back in 2013 along with the R6 shock conversion:
[/url][url=https://foc-u.co.uk/mybb/showthread.php?tid=63987&highlight=debrix+emulators]Fork emulators FZS600
Quite a few others fitted them as I had a cheap group buy from the US.  From memory, worked really well with early VFR800 springs.  Seemingly lost in the annals of time, but perhaps you can revive interest 

[returning rider]

Have only converted one 2017 onwards shock for a Foccer and he was very happy with it.  Hope that spring rate works well for you!

Thanks not had chance to fit it yet got all the bits Faulkner spring for my fat ass weight and top hat bushes for the top mount.
Shock looks a very nice piece of kit and too good for the old fazer should make big difference.

Just finishing doing my sons SV650 front end have fitted linear springs and YSS PD valve (emulators) not tried it as still painting the lowers, but if this works as expected will do the same to fazer.

Ah yes, cartridge emulators for the damper rod forks.
Carried this out out my 600 back in 2013 along with the R6 shock conversion:
[/url][url=https://foc-u.co.uk/mybb/showthread.php?tid=63987&highlight=debrix+emulators]Fork emulators FZS600
Quite a few others fitted them as I had a cheap group buy from the US.  From memory, worked really well with early VFR800 springs.  Seemingly lost in the annals of time, but perhaps you can revive interest 

Yes sadly prices have risen sharply since that posy but the YSS emulators are reasonable price if you shop about and for the SV at least seem to fit perfectly and definitely seem much stiffer when checking by hand at least I went for 2.5 turns and SKF 15w fork oil will be try and see and tweak approach. I followed the advice enlarged the holes in the damper rods and drilled 2 extra as there is more room on the SV than the fazer, welded up the rebound hole. Was pretty easy some have used JB weld or similar with good effect if you do not  have a welder, drilling the holes enlarging easy enough can be done with a hand drill, new holes easier on a drill press but can be done. The fork seal were in good nick on the sv and less than year old so did not change them, this makes the process very quick and easy but if you can do fork seals where you have to drop out the oil and spring and damper rod its the same process apart from the mods to damper rod. Only bit you will need to alter if you change spring or add emulator is the spacer i had to reduce this to get the correct preload  on the spring on fazer it will depend on the spring length. I just used 32mm wast pipe dead easy to cut the SV has a washer on top of the spring and prelaod adjuster is a big washer to spreads load nicely.
Pretty quick and easy process can be done in half day or longer if painting the fork lowers.
The huge amount of kit for the SV is helpful as the linear springs for the curvy SV seem to be perfect for the fazer