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Help need on WR450F valve clearance results

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  • Help need on WR450F valve clearance results

    I recently purchased a WR450F 04 model.

    I have been for a few rides and decided i wanted to do a valve clearance.

    It was my first time doing a valve clearance so i followed the the service manual and all seemed to go well.

    I am not sure what to think about the results and if i need to do anything.

    For the inlet valves i got a of about 8-9mm on each one. The manual said it should be between 10-15. For the exhaust valves i got a reading of about 18-19 and the manual said it should be between 20 - 25.

    Should i be concerned about these results? Is this normal or do i need to do something about it?
    2015 Yamaha YZ250FX
    2015 Yamaha YZ250F

    KTM 125SX 2002. parting it out.
    2008 CRF230F - My Race Bike

    SSB Lithium Motorbike Batteries Available!!!

    https://batteryspecialists.com.au/ba...brand/ssb.html
    PM me for a DBW Discount Code for free Postage :grinning-

  • #2
    You need to make sure your process was accurate, they could be needing shimming but all of them being out makes me suspicious.

    Was the engine cold? Did you find TDC on the flywheel, were the cam lobes pointing to 10 & 2?

    If those things are ok you need to shim everything. Check them in another 500 klm to see if they have moved any more.
    Gone Orange

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    • #3
      Geez your close. i always thought being on the lower end of the spec is better. If you shim it it will take you to the higher end of the spec but within it.
      Its probably been like that for years.... In saying that if you did everything write and those are the readings you should shim it. But im no mechanic thats just what i would do. Actually id probably go for a couple more rides and check it again. But if you couldn't be bothered checking it all the time just change them.
      Current ride is a KTM 250, The best bike I've owned.

      2010 Gas Gas EC 300, Stolen. It has an over sized fuel tank, and a few other unique parts.

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      • #4
        Originally posted by neevo View Post
        You need to make sure your process was accurate, they could be needing shimming but all of them being out makes me suspicious.

        Was the engine cold? Did you find TDC on the flywheel, were the cam lobes pointing to 10 & 2?

        If those things are ok you need to shim everything. Check them in another 500 klm to see if they have moved any more.
        Engine was cold.

        I believe I had TDC. Just to confirm TDC is when you cycle the kickstart lever into the right position before kick starting. Is that correct?
        2015 Yamaha YZ250FX
        2015 Yamaha YZ250F

        KTM 125SX 2002. parting it out.
        2008 CRF230F - My Race Bike

        SSB Lithium Motorbike Batteries Available!!!

        https://batteryspecialists.com.au/ba...brand/ssb.html
        PM me for a DBW Discount Code for free Postage :grinning-

        Comment


        • #5
          Originally posted by walks View Post
          Engine was cold.

          I believe I had TDC. Just to confirm TDC is when you cycle the kickstart lever into the right position before kick starting. Is that correct?
          Witness marks, as per the manual, having said that you can see when the lobes are clear of the buckets.
          Last edited by Tom68; 17-08-2011, 07:00 PM.
          .
          Ignorance leads to confidence more often than knowledge does
          .

          Comment


          • #6
            Originally posted by Tom68 View Post
            Witness marks, as per the manual, having said that you can see when the lobes are clear of the buckets.
            As Tom said there is a mark on the flywheel as you spin it (you remove the 2 caps on the cover near the front sprocket, 1 to move the crank, the other to see the mark) I think it's an "H"?

            Ultimately though you are looking for the lobes to be at their lowest points over each cam cap.

            I would have another go using the mark on the flywheel rather than using the kickstart.
            Gone Orange

            Comment


            • #7
              Originally posted by neevo View Post
              As Tom said there is a mark on the flywheel as you spin it (you remove the 2 caps on the cover near the front sprocket, 1 to move the crank, the other to see the mark) I think it's an "H"?

              Ultimately though you are looking for the lobes to be at their lowest points over each cam cap.

              I would have another go using the mark on the flywheel rather than using the kickstart.
              Ok, thanks for the advice guys, i'll have another go at it tonight and see how i go.
              2015 Yamaha YZ250FX
              2015 Yamaha YZ250F

              KTM 125SX 2002. parting it out.
              2008 CRF230F - My Race Bike

              SSB Lithium Motorbike Batteries Available!!!

              https://batteryspecialists.com.au/ba...brand/ssb.html
              PM me for a DBW Discount Code for free Postage :grinning-

              Comment


              • #8
                Originally posted by walks View Post
                Ok, thanks for the advice guys, i'll have another go at it tonight and see how i go.
                You'll have TDC when when your 2 cam gear marks are are at (Exhaust) 9o'clock and (inlet) 3 o'clock inline with top of head as well as mark through inspection hole in L/H side cover, as the other fella's said, middle plug out to turn the engine over slowly.

                What sort of feeler gauges are you using? I ended up buying a set with smaller point and bent close to the end just for the bike. Found normal automotive set to hard to get accurate reading. :grinning-

                Cheers...
                ^roost 04 WR450 !psm
                81 RM 465 SOLD and SADLY MISSED

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