GSXR750/600 vs 1000 forks

[Dodgy]

Hi

For my project 250, I have given up on sourcing Honda RS250 forks, as they have got quite rare!

I am going to do some measurements, but I am thinking that GSXR600/750 or 1000 front end will fit.

I saw a comment that the Showa 600/750 front end is better than the Kayaba 1000? Is this true? Either way, I am looking at getting the forks locally or Ebay (cheap and plentiful here) and then sending them to RT for a respring and revalve. The main reason I am considering GSXR is that recent PB article fitting them to a NC30 framed RG500 and I know the NC30 front end is close to the NSR...

[imdying]

Have you tried TSS for an RS250 front end. Bottom of page.

[Robert Taylor]

Hi

For my project 250, I have given up on sourcing Honda RS250 forks, as they have got quite rare!

I am going to do some measurements, but I am thinking that GSXR600/750 or 1000 front end will fit.

I saw a comment that the Showa 600/750 front end is better than the Kayaba 1000? Is this true? Either way, I am looking at getting the forks locally or Ebay (cheap and plentiful here) and then sending them to RT for a respring and revalve. The main reason I am considering GSXR is that recent PB article fitting them to a NC30 framed RG500 and I know the NC30 front end is close to the NSR...

Absolutely go for late model GSXR600/750 forks 06 onwards. ( Providing they fit with little drama )They are 41mm whereas the 1000 forks are 43mm and will be a liitle more '' bulky '' on that bike. Also the 600/750 forks are Showa and the internals are somewhat better and are up to the minute in cartridge technology. The midvalve side of the rebound valve is bending shim stack type which gives you much better damping response and brake dive pitch control. The compression base valves are big port and can be revalved for a very decent result.

The 600s have .9 springs, the 750s 1.0s. If you are of average height and weight the .9s will work better on that bike but you likely will still need to respring downwards a little.

The point of what I have said above is that the internals are such that these forks will require a significant amount less time , parts and expenditure than many other forks.

The real negative of finding 250 cartridge type forks is that mostly the cartridges are old and crude and need a lot of work and parts to make them work well. The cheaper they are the more they cost to upspec.

[dipshit]

The 600s have .9 springs, the 750s 1.0s. If you are of average height and weight the .9s will work better on that bike but you likely will still need to respring downwards a little.

I have read advice from suspension tuners on US boards to go for the 600 forks over the 750's for such projects as the 750 forks have the high-speed compression damping adjuster that a lot of the suspension techs don't particularly like and remove anyhow.

The 600 doesn't have the high-speed compression adjusters.

[Robert Taylor]

I have read advice from suspension tuners on US boards to go for the 600 forks over the 750's for such projects as the 750 forks have the high-speed compression damping adjuster that a lot of the suspension techs don't particularly like and remove anyhow.

The 600 doesn't have the high-speed compression adjusters.

Yes, good point!

[Pussy]

The 600 doesn't have the high-speed compression adjusters.

Neither does the 06/07 750.....

[dipshit]

Neither does the 06/07 750.....

Oh right, it's just the K8 and on 750 that got the H-S comp on the forks...

I had researched this a bit myself when I had the SV1000 and was thinking about putting a GSX-R
front end on it... but just ended up getting the whole GSX-R instead.

[Pussy]

Oh right, it's just the K8 and on 750 that got the H-S comp on the forks...

I had researched this a bit myself when I had the SV1000 and was thinking about putting a GSX-R
front end on it... but just ended up getting the whole GSX-R instead.

And a bloody good decision that was, too!

[Dodgy]

Thanks for the advice. I can get a whole 600/750 front end on Ebay for not a lot and I get free (well, costs me a coffee) shipping from the US to here.

I will investigate further!

[F5 Dave]

. . .The 600s have .9 springs, the 750s 1.0s. If you are of average height and weight the .9s will work better on that bike but you likely will still need to respring downwards a little.
. . .

Maybe some Busa forks might be sprung more appropriately Si?

[kiwi cowboy]

Thanks for the advice. I can get a whole 600/750 front end on Ebay for not a lot and I get free (well, costs me a coffee) shipping from the US to here.

I will investigate further!

I got a bucket o coffee if you get me one too