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    Cam walk, options?

    I'm getting the famous cam walk tapping at idle. Cold, or once it's fully hot, it's fine, but rather annoying when you're just puttering around on short trips. Interestingly, I can feel it tapping with my finger on the cam end covers, mostly the left intake.

    While many theories abound, my take is that the cam lobe is offset a bit to the bucket in order to make it rotate. That's the beauty of bucket tappets; they present a continuously different face to the cam to keep things cool. But in the process there is a certain side thrust generated, especially if the bucket isn't perfectly parallel to the cam lobe.

    In this case, I can hear the noise come and go as the bucket rotates, which indicates that one shim or bucket may not be perfectly square.

    The fix I've heard of is to get the shim washer that GS500s have [?] and machine the thrust face of the cam to end up with less endplay. It's a 1mm shim as I recall. But measuring another head I have, the endplay stock is about .012 so why not use a .010 shim washer - or whatever thickness is appropriate - and just leave the cam stock? I can't see how the endplay is really critical considering the head expands way faster than the cam, so a few thou cold ought to be enough.

    Any thoughts from those who have been there?
    '82 GS450T

    #2
    I have no insight for you, but I presume you have visited cliff's page and the end float mod outlined there? here is a link if you haven't:


    good luck!
    1983 GS 1100 ESD :D

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      #3
      If you can hear it while "puttering around on short trips", your ears are a lot better than mine.

      My wife's bike has had noticeable cam walk noise since we got it over 10 years ago. Only happens at idle. By the time the engine hits about 1800 RPM, it's gone. Since virtually all of our riding happens well over 2000 RPM, we never hear it. When stopped at a light, if it happens, it's simply accepted as part of the noise(s) that the bike makes.

      Oh, in the past 10 years and about 25,000 miles, the noise has not gotten any worse, so it's not much to worry about.

      .
      sigpic
      mine: 2000 Honda GoldWing GL1500SE and 1980 GS850G'K' "Junior"
      hers: 1982 GS850GL - "Angel" and 1969 Suzuki T250 Scrambler
      #1 son: 1986 Yamaha Venture Royale 1300 and 1982 GS650GL "Rat Bagger"
      #2 son: 1980 GS1000G
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      Want a copy of my valve adjust spreadsheet for your 2-valve per cylinder engine? Send me an e-mail request (not a PM)
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        #4
        Originally posted by Steve View Post
        If you can hear it while "puttering around on short trips", your ears are a lot better than mine.

        My wife's bike has had noticeable cam walk noise since we got it over 10 years ago. Only happens at idle. By the time the engine hits about 1800 RPM, it's gone. Since virtually all of our riding happens well over 2000 RPM, we never hear it. When stopped at a light, if it happens, it's simply accepted as part of the noise(s) that the bike makes.

        Oh, in the past 10 years and about 25,000 miles, the noise has not gotten any worse, so it's not much to worry about.

        .
        I meant that it only does it when the engine is half warmed and at idle. So it's obvious at stoplights and such in town. I realize that it's unlikely to get worse and does no harm, but I'm building up another engine next winter and would like to avoid it with the least amount of fussing about.
        '82 GS450T

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          #5
          Originally posted by greg78gs750 View Post
          I have no insight for you, but I presume you have visited cliff's page and the end float mod outlined there? here is a link if you haven't:


          good luck!
          I can't imagine going to all that trouble when a simple endplay spacer washer would achieve the same result. My only worry would be that if the spacer piled up somehow you could end up with bits in the cam chain.

          There is no significant end load, and the cam is only turning 4500 at redline and 2500 - 3000 at cruising speed. It shouldn't be too fussy.
          '82 GS450T

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            #6
            Suzuki makes a series of endplay washers for the GS500 - 22X28mm - from 1.0mm in .1mm increments to 1.3mm and also a .7mm. Then there's a wavy washer to spring load it if you want to. You can either mill something off the cam thrust face or put the washer in a surface grinder, which I have access to and is simpler and keeps the cam stock.

            I don't have a Four handy to look at, but it seems like these washers would also work the same way on them. However, the 450 doesn't have an idler sprocket like many fours do so you'd have to be careful to not shim the cam to one side and disrupt the natural flow of the chain. That's possibly why Suzuki left so much endplay in there in the first place. But you could turn the motor through a few revolutions and then measure the clearances on each side.

            Still hoping to hear from someone who has done this…..????
            '82 GS450T

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              #7
              I wear earplugs.
              http://img.photobucket.com/albums/v5...tatesMap-1.jpg

              Life is too short to ride an L.

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                #8
                Originally posted by John Park View Post
                However, the 450 doesn't have an idler sprocket like many fours do ...
                I could be mistaken, but I think it's only the early 750s (the two-valve ones) and the 850s that have the idler.

                .
                sigpic
                mine: 2000 Honda GoldWing GL1500SE and 1980 GS850G'K' "Junior"
                hers: 1982 GS850GL - "Angel" and 1969 Suzuki T250 Scrambler
                #1 son: 1986 Yamaha Venture Royale 1300 and 1982 GS650GL "Rat Bagger"
                #2 son: 1980 GS1000G
                Family Portrait
                Siblings and Spouses
                Mom's first ride
                Want a copy of my valve adjust spreadsheet for your 2-valve per cylinder engine? Send me an e-mail request (not a PM)
                (Click on my username in the upper-left corner for e-mail info.)

                Comment


                  #9
                  I have the same thing in mine. When it does it, it sounds like it mostly coming from the intake camshaft on the right side. It sounds terrible, at first you would think it's a rod knocking. It's embarrassing needless to say. I think I hear a cam chain noise too when the engine is cold. Going to go over it very closely next time I take the valve cover off. Like everyone else's, the sound goes away over 1500 or so RPM. And after the engine is fully warmed up you can't hear it.

                  video, sharing, camera phone, video phone, free, upload

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                    #10
                    Just a point - before going to the trouble of machining things, check that you haven't got an undersize shim.
                    Way back, I found a couple of yamaha shims fitted to a GS - about .5mm undersize on the OD...rattle city.

                    Comment


                      #11
                      Originally posted by John Park View Post
                      Suzuki makes a series of endplay washers for the GS500 - 22X28mm - from 1.0mm in .1mm increments to 1.3mm and also a .7mm. Then there's a wavy washer to spring load it if you want to. You can either mill something off the cam thrust face or put the washer in a surface grinder, which I have access to and is simpler and keeps the cam stock.

                      I don't have a Four handy to look at, but it seems like these washers would also work the same way on them. However, the 450 doesn't have an idler sprocket like many fours do so you'd have to be careful to not shim the cam to one side and disrupt the natural flow of the chain. That's possibly why Suzuki left so much endplay in there in the first place. But you could turn the motor through a few revolutions and then measure the clearances on each side.

                      Still hoping to hear from someone who has done this…..????

                      They would have to fit past the first lobe of the cam, to get to the cam cap which is the thrust surface. Maybe I'm not understanding you correctly?
                      http://img.photobucket.com/albums/v5...tatesMap-1.jpg

                      Life is too short to ride an L.

                      Comment


                        #12
                        Originally posted by GregT View Post
                        Just a point - before going to the trouble of machining things, check that you haven't got an undersize shim.
                        Way back, I found a couple of yamaha shims fitted to a GS - about .5mm undersize on the OD...rattle city.
                        Thanks for the hedzup; my bag of spare shims came as a grab bag with some obviously huge OD ones in there from who knows what. I'll check.
                        '82 GS450T

                        Comment


                          #13
                          Originally posted by tkent02 View Post
                          I wear earplugs.
                          Same here. This is not a problem worth solving.
                          1983 GS850G, Cosmos Blue.
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                            #14
                            Originally posted by bwringer View Post
                            Same here. This is not a problem worth solving.
                            In your opinion. Because it seems to be so difficult to fix, many - including Suzuki - have deemed it an innocuous annoyance. Which it is. If I can fix it with a few OEM washers on a twin, your opinion about it on fours may be irrelevant.

                            It's worth it to me.
                            '82 GS450T

                            Comment


                              #15
                              Let us know wham you have it figured out.
                              http://img.photobucket.com/albums/v5...tatesMap-1.jpg

                              Life is too short to ride an L.

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