gsxr600 rear shock

[dougie conacher]

Hi there
picked up a rear shock from a 98 gsxr600 and hoping to fit it to my nc30 its 3mm longer than stock,the weight of both bikes is similar so i thought it might work on the vfr the guy at nitron reckons am wasting my time as the gsxr and the vfr are totally diffrent.Wondering if anybody has tried it am sure i saw a thread onhere about someone who had done it but cant find the thread
cheers dougie

[rcv4]

he is dead right,drop it in the bin!

[andreasmkr]

I`m running a GSXR 600 rear shock on mine.... Works great. The only thing you have to do is grind some of the top of the shock to get the NC30/35 top mount fitted (The one that goes over the top of the shock and into ther frame)

[Drunkn Munky]

Only GSXR shock i know of that fits is the 06/07 600/750cc one, and that need a spring swap and the valving sorted to work right.

[thrasher]

waste of time unless your gonna get the correct spring for your nc and get it revalved!
tried 3 different "bolts straight on with no mods" gsxr shocks all soft as shite.

[dougie conacher]

I`m running a GSXR 600 rear shock on mine.... Works great. The only thing you have to do is grind some of the top of the shock to get the NC30/35 top mount fitted (The one that goes over the top of the shock and into ther frame)

Did u change the spring or do anything else other than file the top of the shock, the nitron guy reckoned the tyre would hit the underside of the seat due to the difference in stroke length

[Jashdown]

If the mounts are the same as the NC30 mounts, then sure it should fit. It will obviously need a new spring, but I don't understand why everyone says it needs to be revalved. Why do they need revalving?

If you put a stiffer spring on it, then it will compress/rebound at the same rate/speed that it would in the intended bike.. I really don't understand why they need to be revalved, unless it's being raced, in which case any shock would need to be revalved.

[Neosophist]

If the mounts are the same as the NC30 mounts, then sure it should fit. It will obviously need a new spring, but I don't understand why everyone says it needs to be revalved. Why do they need revalving?

If you put a stiffer spring on it, then it will compress/rebound at the same rate/speed that it would in the intended bike.. I really don't understand why they need to be revalved, unless it's being raced, in which case any shock would need to be revalved.

Erm.

I'm ill and tired but i'll try and make at least a half-assed explanation.

The rebound and dampening of the shock is controlled by the 'valves'.. there ususally a series of holes and passageways from which the oil can flow in and out of, restricting how fast the shock absorber can compress and rebound.

These are either static (fixed) or have a range of adjustment (soft -> hard).

Regardless of if they are fixed or static they have a finite range that is designed to work in combination with the spring on the shock.

When you put a stiffer or lighter spring on the shock you change the amount of force needed to compress the spring, but you havn't changed the amount of oil that can flow through the holes.

Now your dampening and rebound is still based on how the old spring would react but you now have a spring that will work differently so the shock will need to be adjusted to suit.

I think I see your original thinking that with the stiffer spring, in the NC30 the shock will compress as much as it did in the other bike with the softer spring (I think this is what your getting at?)

I doubt this would really be the case though, the bikes too different and depending on rider too your individual spring will vary.

After selecting a proper spring it'd be wise to visit a proper suspension place (unless you know how to do it yourself) and get the shock sorted out.

While the 'newer' shock may feel better (the old ones are often knackered) it might inspire too much confidence and if it's not properly upto spec a bump etc on the road could have the bike over.