Rocker Arm Shim

Discussion in 'Airheads' started by some_guy, Oct 10, 2012.

  1. Airhead Wrangler

    Airhead Wrangler Long timer

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    As far as I know, that's not correct. No /5 models were shipped with the needle bearing rockers. The needle bearing rockers were introduced with the /6s. In fact some early /6s, only R60 and R75 models it seems, were still shipped with the bushed rockers and not the needle bearing ones as the factory had to consume its remaining stock of the bushed rockers. It seems the factory acknowledged their inferiority as during the transition between the two types they only installed the bushed rockers on R60/6 and R75/6 models and put nothing but the newer, better needle bearing rockers on their flagship R90/6 and R90S models.
    #21
  2. woodly1069

    woodly1069 Long timer

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    guess I need to take her apart anyway to see how things are wearing and I will post a photo then, Thanks again guys!
    #22
  3. supershaft

    supershaft because I can

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    You save me a lot of typing AW. :D It seems the factory ackowledged their inferiority going way back to the R69S since they had needle bearings. Did the R68? I am pretty sure the R54 did? Prewar GP bikes?
    #23
  4. disston

    disston ShadeTreeExpert

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    I owned a 1974 R90/6 that had bushed rockers. They were not /5 bushed rockers. They were the full length type /6 rockers. This was a long time ago and I don't have the bike anymore. I suppose the rockers could of been changed out by somebody else. In fact the guy I bought the bike from had low morel values and was rather unscrupulous. We were friends at the time.

    I replaced those rockers with a Capital Cycle kit. Wrecked the bike and sold it to another guy that used to be a friend. He then wrecked this bike again. Not sure what ever became of the bike but the night he wrecked it he called my girl friend and had her take him and the R90/6 home in the trunk of her Dodge Dart.

    Sorry it's such a long story. I can just never get over this one.
    #24
  5. chollo9

    chollo9 Screwed the Pooch

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    At least she didn't let him ride in the car.:1drink
    #25
  6. Airhead Wrangler

    Airhead Wrangler Long timer

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    DAMN! I waited. Now they're all $2.59 except for the .50. What a difference a month can make.

    11 11 33 1 337 718 SHIM - 0,30 X $2.59
    11 11 33 1 337 719 SHIM - 0,25 X $2.59
    11 11 33 1 337 720 SHIM - 0,20 X $2.59
    11 11 33 1 337 721 SHIM - 0,35 X $2.59
    11 11 33 1 338 190 SHIM - 0,50 X $0.73
    #26
  7. supershaft

    supershaft because I can

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    Early /6's came like that. That article up above is all wrong on numerous fronts.
    #27
  8. disston

    disston ShadeTreeExpert

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    I may be the only one with this opinion but I think bushed rockers work just fine as long as the bushings are in good condition. They used bushed rockers on the 427 and 428 FE Ford engines. Many, many other engines used bushed rockers. But most will up grade to a roller rocker if they have the money and there are usually kits to do this if you have the money. I think the kit to fit FE blacks was not available till Shelby came out with it about ten years ago. Now he's dead but the parts he made for those engines are still available.

    I don't know if you can rebush the /5 rockers. Any time the subject comes up everybody starts chanting /6, /6, /6 so I just don't know if those bushings are available. Never heard of anybody doing it. If I had a /5 I think I would look into it.
    #28
  9. supershaft

    supershaft because I can

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    You can re-bush them. The problem is that usually the bushings start spinning in the rockers and wear the rocker arms out so that option is no more. The spinning bushings also usually wear out the shafts. The bushed setup works. They just don't work as well for nearly as long as the needle bearing setup. Plus, when a needle bearing does give up at usually a much later point, they usually don't eat the rocker and shaft at the same time.
    #29
  10. disston

    disston ShadeTreeExpert

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    Oh.
    #30
  11. Byron1

    Byron1 Been here awhile

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    It's a bit of a "how long is a piece of string" question, but in your collective experience, how long should I expect the needle bearings to last? Bike has a full service history, regular oil changes, I have never really ridden it hard... For long anyway.

    Also what would be the typical signs of them approaching the end of their life?

    I have a r100rs 79 with about 81k miles on the clock.. It has the plastic spacers at the end of the rocker arms so I assume at some point the original ones were changed. (basing that assumption on what I am reading above)..

    I suppose what I am getting at, is should I consider replacing them as a maintenance task or should I just leave alone?

    Apologies to hijack the thread but you all got me thinking...

    Thanks,

    Byron
    #31
  12. supershaft

    supershaft because I can

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    How long do they last? It's all over the map. Keeping the endplay at a minimum helps but it is not a cure all. I don't worry about them but I check them every time I have the rocker arms off for some reason. I replace them all when I am doing a valve job. I replaced them all when I put my sport cam in 70k miles ago and again now that I just got a valve job. I had one break this last time I checked at 70k miles. It got into the shaft a bit too.
    #32