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Rc51 Shock Swap?


KevCarver

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I have a spare stock RC51 shock laying around and I was wondering if anyone had tried a swap in a VFR, 5th Gen specifically.

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Kevin,

I have an elka 3way I recently removed from my 51 and compared it to an original 4gen I also had laying around. The lengths are surprising close (couple of mm's) enough that a shim would even things up.

Issues: the bottom mount is a clevis type like the 3gen. Next, spring weights are very different; enough so that I'd suspect the valving would be too but that's just a WAG.

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Keep in mind that just fitting is the first of your problems. The RC51 shocks use a very light spring rate and valving, so much so that it would totally useless as is. Just a spring probably would not do it either, you would need internal valving changes as well. Totally possible though!

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And by the time you had it resprung and revalved, you're looking at something near the cost of a correct shock.

At least that's the way it is for me, way up here, when I factor in exchange rate, shipping both ways, etc.

Unless you happen upon the RC51 shock for free, or already have owned it outright for some time (takeoff from a bike you're selling?) then I'd get one that's already sprung and valved correctly.

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A revalve is $195 and a spring is $85, for $280 you'd be hard-pressed to get something better performing!

I though the RC51's had the wrong lower mount too?

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Well it's just sitting around right now. I figured if nothing else it isn't 60,000 miles and 10 years old, as is my current shock.

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Well it's just sitting around right now. I figured if nothing else it isn't 60,000 miles and 10 years old, as is my current shock.

What are you going to do about the difference in lower mount?

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Guest vfrrider

But it does fit the 3rd gen. I have one all set for my RC211V replica. Got it in a deal with a 2005 RC51 front wheel and a few other parts. Right price. You can pick up a Ohlins at a very reasonable costs.

Larry

VFRRider

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Well it's just sitting around right now. I figured if nothing else it isn't 60,000 miles and 10 years old, as is my current shock.

This was the extent of my plans. :biggrin:

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  • 11 months later...

Bump

vfrrider,

Did you get that RC51 shock mounted up yet? I also have a White 93 with 50k on the stocker. Trying to figure out a shock strategy without paying the value of my bike for it.

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Bump

vfrrider,

Did you get that RC51 shock mounted up yet? I also have a White 93 with 50k on the stocker. Trying to figure out a shock strategy without paying the value of my bike for it.

A few other options, Penske and Wilbers still make shocks. I was quoted very reasonable prices from GMD in Massachusetts on the Penske and I bought a Wilbers shock from Max BMW in Portsmouth NH. If you order the Wilbers it does take a while for them to build and ship from Germany but it will be made to your specs.

I would listen to Jaime on this as well. I thought I could slap in something close before I knew a whole lot about springs. After educating myself the VFR requires a "dump truck" spring because of the geometry of the lower linkage. So just because it "fits" does not mean it is correct or safe.

I thought someone had a shock Jaime worked on for sale in the classifieds.

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  • 2 weeks later...

Has anyone tried/measured RC51 linkages? If they would fit, it might allow RC51 spring rates and valving (i.e. less progressive).

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Has anyone tried/measured RC51 linkages? If they would fit, it might allow RC51 spring rates and valving (i.e. less progressive).

RC51 uses a dual-sided swingarm. I doubt the linkage would be anything close to fitting.

Then there's swingarm length, the distance of the shock centerline to the pivot point, etc, etc. Not so simple.

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