F800GS - RXV Shiver'ed Fork Conversion

Discussion in 'Parallel Universe' started by Gangplank, Jul 25, 2010.

  1. epicxcrider

    epicxcrider Been here awhile

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    200 LB. They are still a little soft, but with adjustable damping it makes up for it. I may buy stiffer ones at some point but not a concern ATM.
  2. NCD

    NCD Dirty Hairy

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    Now that I've had both apart, I want to amend this. Both my Ohlins .55 and the stock RXV springs were 480mm plus a 30mm spacer. AF1 Racing says that STIFF RXV springs are 512mm. Not sure if that is all spring, or still 480+30.

    Some notes for the collective as I do this:

    1. Don't tell machine shops that it is a BMW fork. I think it spooks them. All my local machine shops were too big, too busy, or chicken shit. They are now on their way to Dale at JB Machine. Super nice guy, and already knows the dealio.

    2. If you are shortening your travel back to stock, this spring from McMaster-Carr is nearly perfect:

    <TABLE class=OrdDtlTbl><TBODY><TR class="OrdDtlRow MouseOverRowHighlight"><TD class=OrdDtlLnNbrCol></TD><TD class=OrdDtlPartNbrCol>9657K358</TD><TD class=OrdDtlQtyCol></TD><TD class=OrdDtlDscCol>Steel Compression Spring, Zinc-pltd Music Wire,1.50"l,.750"od,.135"wire</TD></TR></TBODY></TABLE>

    It's mega stiff, the ID and OD are correct, and it's 38mm long. Even the ends are ground flat so it rests nice in place. Just crimp one end down a little tighter so it will bind on the shaft a bit. Slide that end down first. Now inertia won't move it up and down and booger anything, and the small oil port stays unblocked as well.

    3. This manual is way helpful:

    http://www.americanbeta.com/sites/d...r/Marzocchi 45-50mm open cartridge shiver.pdf

    Just wanted to pay back for all the info I stole from this thread!
  3. DoWorkSon

    DoWorkSon Been here awhile

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    Any chance of pics of spacer(spring) installed?

    Hopefully Dale gets the work done faster for you. I just got my forks back yesterday and they were sent about 3 weeks ago. I did let him keep the donor fork for him to cut up so he could get exact measurements for the internals, so might be quicker for you.
  4. Gangplank

    Gangplank Advenchaintourer

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    For the record his turn around for me has always been less than a week. His shop is big and does 1000 part orders. He is nice enough to help out and do this kind of work so cheap. Other shops want $250 if they will even touch BMW "magic" parts.
  5. epicxcrider

    epicxcrider Been here awhile

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    Yes, most shops won't touch a small job like this if they're busy and you're lucky to find one that will. Heck I can't even get shops to meet a month lead time on machined parts at work.
  6. NCD

    NCD Dirty Hairy

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    One local quoted me 3 hours at $125 per. I put some extra money in the shipment to sweeten the deal a little bit :evil
  7. NCD

    NCD Dirty Hairy

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    I already reassembled my cartrigdes. But it looks like -W-'s spacer on page one, but just a big spring instead.

    Are you still trying to understand where it goes? I could lay my extra spring next to the finished cartridge to illustrate if thats the issue.
  8. NCD

    NCD Dirty Hairy

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    I know this question popped up a few times in this thread. Here is where you reduce the travel (pics show finished cartridges.)

    [​IMG]

    See the little silver spring sitting on top of the finished cartridge? Thats where it goes, but INSIDE the cartridge. You have to pull everything off of the shaft so that the whole thing can back out. Install the spring/spacer on the shaft, and put it back together.

    [​IMG]
  9. DoWorkSon

    DoWorkSon Been here awhile

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    Thank you sir!
  10. epicxcrider

    epicxcrider Been here awhile

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    Nice find on the spring
  11. dirtysouthjacket

    dirtysouthjacket Been here awhile

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    All done. Taken it on a few powerlines so far. I used stock springs and a 5W oil and its definitely too soft. I need to take some measurements as well. Also I'm 180, 195 with gear on. I might start with stiffer springs and then keep playing from there. The suspension guy wants me to ride it a little bit before I stop by to do anything else. Thanks to everyone that helped out. I definitely couldn't have done it without it. I kind of want to go find some Shiver stickers to slap on it now. Also, I took really detailed notes along the way and would be more than willing to forward them on to anyone looking to do the swap.

    [​IMG]
  12. NCD

    NCD Dirty Hairy

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    I was going to try 7.5 to start, since that is what both the 800 and RXV use stock. One thing to check - the OEM setup preloads the springs 20mm. I had to cut the black spacers down to 14mm to get that back in line. If you ran the full Shiver travel you might have 0 preload!
  13. DoWorkSon

    DoWorkSon Been here awhile

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    I went with a set of race tech .95 springs... Going 7.5 oil... I wasnt able to get them revalved before a trip I'm leavin on Friday so hopefully they work alright...

    What's air gap is everyone using?
  14. dirtysouthjacket

    dirtysouthjacket Been here awhile

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    I went with 90 mm which is what was called out in the Marzocchi manual. Have fun on your trip!
  15. dirtysouthjacket

    dirtysouthjacket Been here awhile

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    Yeah, my local store was slap out of 7.5... I figured I could go with 10w later if need be. I also got the cheap Maxima stuff.

    What do you mean by no preload if you use the full Shiver Travel? Are you saying if you don't use the stock preload spacer? I used it, and my measurements comparing the Husky and BMW cartridges extended were actually 30mm shorter (220 vs 250). This was measuring from the top cap to the spring seat. The husky cartridge had a short 20mm spring spacer to limit travel.
  16. epicxcrider

    epicxcrider Been here awhile

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    I have it set up this way and it works great. Zero preload because the fork extends more, but the ride height is exactly stock. Gained a little down travel with no ill effects or change to suspension geometry!
  17. NCD

    NCD Dirty Hairy

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    Looks like epic answered and confirmed. It's tough because we are all getting fork guts from diiferent sources and I think there are some variances. The spring seats are higher, fork caps deeper, different springs and spacers - - but hey - - if it works, ride it!
  18. DoWorkSon

    DoWorkSon Been here awhile

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    What are the stock factory settings on the shiver forks?? Would like a starting point for adjustment

    Forks installed and feel good. Test ride in a few. I was unable to get them worked on at local shop so going in blind(as far as a revalve) on my ride this weekend, but hoping no issues. Stiffer springs, 7.5 oil, 90mm air gap.
  19. epicxcrider

    epicxcrider Been here awhile

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    Start with the adjustments smack dab in the middle and go from there!

    Ugh, noticed my seals might be weeping after a little uh... "aggressive" off road trip last night. Gotta clean em off and see if it returns under normal use. Otherwise gotta take some oil out.
  20. dirtysouthjacket

    dirtysouthjacket Been here awhile

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    Marzocchi manual says 12 clicks in on the rebound and 10 on the compression.