"This" being: swap fork internals from SP2 to SP1. We all know SP2 forks are "shorter" than SP1 forks, but my online research strongly suggests that this is simply a function of the SP2's monstrously long OEM top-out spring, rather than of any of the SP2's non-springy parts actually being shorter. The US RC51 workshop manual doesn't even bother illustrating the SP2's internals, they're so close... (FWIW, I've found that the 954 workshop manual does show the maintenance procedures applied to the same type of fork parts that the SP2 has.)
(I have a set of SP2 forks that have been fettled by a well-known suspension tuner over here, so I was planning on using them as-is on my FP, but the "clamping zones" of the outer tubes of these forks are slightly different than those of SP1 outer tubes--not a lot different, but just enough to be incompatible with the lower triples I'm using (VFR1200*) and the height at which I want to mount the forks.
* Note: VFR1200 lower triple clamps have 55mm ID openings; in order to use SP1/SP2/929/954 forks (54mm OD) I will have to fit 0.5mm shims, but this is easily resolved.)
That said, there are some parts differences between the SP1 and SP2 fork internals, but I don't know if they would prevent swappage. I currently have a pair of newly re-annodised SP1 outer tubes, good condition SP1 lowers and new bushings/seals ready to go. I'm thinking that all I will need to do is fit the new bushings and seals to the cleaned SP1 uppers and lowers, and drop in the already assembled SP2 cartridges/springs/fork caps, oil and Robert's my mother's brother, right?
Question
JZH
I think I can do this...
"This" being: swap fork internals from SP2 to SP1. We all know SP2 forks are "shorter" than SP1 forks, but my online research strongly suggests that this is simply a function of the SP2's monstrously long OEM top-out spring, rather than of any of the SP2's non-springy parts actually being shorter. The US RC51 workshop manual doesn't even bother illustrating the SP2's internals, they're so close... (FWIW, I've found that the 954 workshop manual does show the maintenance procedures applied to the same type of fork parts that the SP2 has.)
(I have a set of SP2 forks that have been fettled by a well-known suspension tuner over here, so I was planning on using them as-is on my FP, but the "clamping zones" of the outer tubes of these forks are slightly different than those of SP1 outer tubes--not a lot different, but just enough to be incompatible with the lower triples I'm using (VFR1200*) and the height at which I want to mount the forks.
* Note: VFR1200 lower triple clamps have 55mm ID openings; in order to use SP1/SP2/929/954 forks (54mm OD) I will have to fit 0.5mm shims, but this is easily resolved.)
That said, there are some parts differences between the SP1 and SP2 fork internals, but I don't know if they would prevent swappage. I currently have a pair of newly re-annodised SP1 outer tubes, good condition SP1 lowers and new bushings/seals ready to go. I'm thinking that all I will need to do is fit the new bushings and seals to the cleaned SP1 uppers and lowers, and drop in the already assembled SP2 cartridges/springs/fork caps, oil and Robert's my mother's brother, right?
Cheers,
Link to comment
Share on other sites
27 answers to this question
Recommended Posts
Archived
This topic is now archived and is closed to further replies.