RC36Rider

The OEM F4i spring is tapered. Exact dimensions and rates of OEM springs are not generally published by manufacturers. This makes finding a suitable OEM spring difficult. Have a look at Race Tech's website here: http://racetech.com/ProductSearch/2/Honda/CBR600F4i/2002 Scroll down to 'Rear Shock Springs & Kits'. You'll see that they offer 2 models of shock spring: SRSP 6016 is suitably tapered SESP 60225 is cylindrical and needs adapter collars IMO, the Daugherty Motorsport offering is a great value proposition given that you get a shock that was fully cleaned, refurbished, re-valved, re-sprung and adapted to the correct length.

Different gens of the CBR 900 have different shocks. Even the 929 and 954. None really fit the 5th Gen VFR w/o mods. Look at DMr's offering here: http://www.daughertymotorsports.com/vfr800.html Pay attention to the extension at the top of the shock.

Just found this also: Nitrogen Pressure (14.5 psi =1 bar): 285 psi Source: Race Tech's DVS sheet for my 6th Gen's stock Showa.

Good to see that someone is interested. Yeah! While his website is somewhat lacking in glitz and orderly presentation, it is more than made up for by the numerous nuggets of great info.

Just in case you are still interested ... have a look at this: http://www.peterverdone.com/archive/05shock.htm Roughly 242 PSI in the stock shock off an '05 CBR 600 RR.