RaceTech Valve on a G/S - Let's talk to Racetech

Discussion in 'Old's Cool' started by StephenB, Jan 19, 2007.

  1. StephenB

    StephenB G(/)S ... what else!

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    Kevin, finally somebody is stepping forward to help out. Racetech has not responded yet, but I guess it is the busy part of the year and our request might be in the queue.

    I think we are all in agreement about the procedure on the 88-95 R100GS where only one fork needs to be modified. Thanks for offering that service, seems to be a great deal.

    As you have explained, the procedure on the 80-87 R08G/S is slightly different. Also both forks need to be modified. I am more of a DIY guy and would be happy to do the work myself if somebody (like yourself) sells the correct valve emulators with installation instructions. Unless there is milling involved or a lathe required I think I can manage. Unless you tell me that location of the additonal holes is so critical that only you can do it.

    You message seem to indicate the 80-87 G/S valve emulators are readily available (part no. ???). They don't appear on the application guide though which makes me wonder: is it just not published because it is not Plug 'n Play and needs some modifications of the fork internals?


    Stephen
    #21
  2. independent

    independent Adventurer

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    Stephen,
    If you've got a drill press & vise, drilling the holes in the damper rod isn't difficult. No lathe or mill is required. The hole pattern is specified in the RT instructions that are included with the emulators, and even the pattern itself isn't too critical. The purpose of the extra holes is to allow sufficient oil flow to the emulator itself, which then does the flow-control for compression damping. Rebound damping will be controlled by the oil viscosity, easily changed by draining & refilling the oil.
    The emulator that fits the R80GS fork is FEGVS3301. Readily available from Racetech or most bike shops. The RT spring that fits is FRSPS2350XX (the last 2 digits vary with the chosen spring rate, which depends on how heavy the rider is). There does need to be a short spacer fabricated for the emulator to sit upon, on top of the damper piston. A short piece of thin-wall aluminum tube works fine.
    Don't be too hard on Racetech, they're a company that's focused on the
    high-volume dirtbikes/streetbikes, and have limited experience with our old and/or unusual bikes. They make good products, but just don't know all the uses we put them to.

    cheers
    kevin
    #22
  3. StephenB

    StephenB G(/)S ... what else!

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    No, not being hard on RaceTech, I know we operate a dying species but I can tell you that we are still kicking pretty darn good with those 80 G/S's !

    I see, FEGVS3301 is the one for the 70-80 36mm forks. That does work for the G/S, eh? I always thought it should, but never got a definite answer.

    Thanks, Kevin, appreciate your input, I'm all set now.


    Stephen
    #23
  4. Cordless

    Cordless Two Wheel Addict

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    Kevin,

    Let me see if I've got this figured right.

    Emulator FEGVS3301 $159.99

    Spring FRSPS2350XX $109.00

    [Kevin's fabrication time $100.00 + parts and shipping $100]


    Estimated total so far $480

    Ballpark?



    If we do it ourselves, cost approx. $300 (No Kevin, no extra parts)

    This assumes no break on price from RaceTech.

    Editted as a result of StephenB's post pointing out my errors.
    #24
  5. StephenB

    StephenB G(/)S ... what else!

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    I am pretty sure you got it all wrong:

    80-87 G/S (DIY):

    Emulator FEGVS3301 $159.99 (already a pair)

    Spring FRSPS2350XX $109.00 (already a pair)

    + shipping the parts to you

    88-95 GS (Kevin):

    Parts ~$70 + labour $100 + shipping back/forth
    #25
  6. independent

    independent Adventurer

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    Tallerman,
    I did a bit of homework and have come up with an estimate for the R80GS forks.
    Emulators $169 (current price in RT catalog)
    RT springs 109
    Emulator spacers 10 (I"ll make these)
    fork oil 10
    damper piston rings 40
    fork seals 11
    crush rings 3
    labor 100
    shipping 80 (UPS gnd)

    That totals at $532. Not cheap, but the feeling of control you'll get is worth it. Plus, adjustments to the damping are simplified compared to the original fork. Changing the oil viscosity controls the rebound damping. Just change the oil for a noticeable difference, without affecting the compression damping-that's adjustable by removing the fork springs, pulling out the emulator valves & changing the preload screw adjustment on the valve. Drop the emulators back in, put the fork springs back in & away you go.

    I did find out there's two different series of RT springs that will work.
    FRSPS2350xx(.85-1.0kg/mm) or FRSPS2643xx(.80-.90)
    The diameters/lengths are different, as are the stiffness ranges. So if you're really heavy or really light, you'll want to pay attention to that so that the sag is correct with you on the bike.

    cheers
    kevin
    #26
  7. Rapid Dog

    Rapid Dog bikes, booze, broads...

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    looking at the website I see
    PN FEGV 3301 FRK EMULATOR-26.5/19.5/13.5mm
    I dont see an FEGVS3301...:huh
    #27
  8. wintonio

    wintonio last of the Dum Dum Daze

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    for dropping the ball, but in hindsight, it looks like there is no way I could have gotten an answer like Kevin's without actually having forks in hand. You might want to google search the part #'s and find them cheaper at a different company. I ended up getting a set for my GS at about $40 less than RT charges, just an idea.

    edit: are the new RT springs that much better than the BMW stock springs? Is it worth having to get new spacers milled? I am a noob in the worst sense, with a club foot for a hand and what seems like a pegleg for a foot, and I am nt having any problems with this project, except perhaps forgetting the orientation of the damping spring. Take the advice that I rarely take, and Keep It Simple
    #28
  9. bereahorn

    bereahorn Long timer

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    PM sent
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  10. Rapid Dog

    Rapid Dog bikes, booze, broads...

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    PM sent to whom?
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