Changing fork oil in a 2kr (was fork question answered 2kr)

Discussion in 'Yamaha 250cc In-Line 4's' started by sandrunner, May 24, 2004.

  1. sandrunner

    sandrunner New Member

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    Hi, I'm wanting to change the fork oil in my wife's FZR250 and I'm a bit confused. It's a 2KR model and the tops of the forks don't unscrew like my bandit 400's do. I've looked down inside the tops and can see a C-clip holding what looks like a plug in. Has anyone else had to deal with this setup, and is there any way to prevent rust from forming in here with the caps on? Thanks in advance for any info you can provide.
     
  2. sandrunner

    sandrunner New Member

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    Well it's been a while since I posted this question, but I finally got dirty since my seals were toast. 2kr fuzzies don't have the screw on cap on the top of the forks. Just a C-clip and a plug. First, remove the forks from the bike. Then remove the rubber stopper on the tops of the forks. I went after the plug and c clip with my dremel and a wire brush attachmetn to clean up all the rust and see the seperation between the plug and the clip better. Then I used a 6" 3/4 extension to press down on the "plug" at the top of the forks. It moved down about 3/4" and made it much easier to pry out the c-clip. Once the clip was out I gently compressed the fork and the "plug" poped right out. I didn't see any spacer, just a really long spring. I dumped out the old oil "wow that's 1987 nasty" and flushed out the fork with new oil. Disassemby of the rest of the fork and seal replacement is like any other bike. I used 390ml of 20wt oil to refill the fork. Then had my wife (it's her bike) use the extension to press the plug back in while I finagled the C-clip back in the slot. Reinstalled the rubber plug and moved to the next fork. Total time was only about 1.5 hours and most of that was in lifting and supporting the bike to where it was stable. I'd recomend going with a lighter oil though(10-15wt). I use 20wt on my bandit and I think it may be a bit too thick for the fuzzy. Final result? Much firmer front suspension, doesn't feel like it's about to wash out while scraping the pegs in the mountains. As an added bonus for me, no more leaking fork seals as well.
     
  3. Boz

    Boz New Member

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    Thanks for the info!!! Sorry we couldn't be much help - obviously it isn't something many of the 2kr owners here have experienced yet...
     
  4. TBone

    TBone New Member

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    WOW a 20w

    I use 10w in CBR250s for that firm feel but most other people recomend 7w in small bikes like the CBR250 and FZR250...

    I know the 2KR has very soft front suspension from new... it would be interesting to how much it efects the bike...
     
  5. summitdog

    summitdog New Member

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    Does anyone know the fork seal size for the 2KR?

    Thanks,
    Scotty
     
  6. kokorozashi

    kokorozashi New Member

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    Front fork Problems

    hmmm, I too have a bad seal in my left front fork(2kr), which would be cause for the low oil in it. Even if I do minor stops(using only the front brake) it bottoms out. I was wondering if by just adding new oil the problem could be fixed, or if I have to get new seals. I'm in Japan so I don't think it'd be too hard to get them but I too do not know the size. Also, in the end what weight should I use? 10-20? Are there any adverse effects to using an over viscous oil?
     
  7. sandrunner

    sandrunner New Member

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    Hop down to your local Nap's or Kei-Ue and order up all the seals. You'll want the 2 oil seals and the two dust seals. I am in Japan as well (Sagamihara). Use either 10 or 15 wt oil from DS depending on if you want the stock feel or a bit fimer.
     
  8. adjudrey

    adjudrey New Member

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    i'm planning to change oil seals on my front forks. can some1 help me by posting a simple how to here??

    also, does anyone know how long is the standard length of spring on front forks?

    planning to place spacers if my springs are already compressed (normal wear). THANKS Bro's! <!-- s:alcoholic: --><img src="{SMILIES_PATH}/icon_all_coholic.gif" alt=":alcoholic:" title="Alcoholic" /><!-- s:alcoholic: -->
     
    • Well said! Well said! x 1

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