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Thread: Clattering noise -- can't tell if it's cam chain, radiator fan, or something else

  1. #11
    Senior Member purplecx500's Avatar
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    And a steep learning curve if you

    plan to make that trip.
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  2. #12
    Super Moderator ramprat06's Avatar
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    The primary reason these bikes end up in a pile in the corner of some dank dungeon is for this single fact alone......timely and regular maintenance is not done.

    Oil change is the dumb one that everyone understands because it's easy and common. But just as easy and should be common is the timing chain adjustment when doing a valve lash adjustment. All 3 of those should be done at the same time, it is easy and non-invasive (unless you call taking off the valve covers invasive....) Those alone can keep this venerable motor running forever (anecdotally).

    Too many people in the late 70's and mid 80's bought these bikes as toys, for the most part. Play with toy until it breaks, throw it in the corner. Enter today's era, and we are digging out those closets to find that only one or two simple to fix pieces were wrong with toy......and here we are.
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  3. #13
    Senior Member rscottp's Avatar
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    So true Ramprat, I just bought a 86' Yamaha Radian with 1,720 miles on it. Tank is rusted to nothing and the seat is pristine. Amazes me how people buy stuff and never use it.
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  5. #14
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    Quote Originally Posted by purplecx500 View Post
    And a steep learning curve if you

    plan to make that trip.
    I sure plan to make it...so I guess I have a lot of wrenching in my future. The trip is supposed to start July 15th.

    Quote Originally Posted by ramprat06 View Post
    The primary reason these bikes end up in a pile in the corner of some dank dungeon is for this single fact alone......timely and regular maintenance is not done.

    Oil change is the dumb one that everyone understands because it's easy and common. But just as easy and should be common is the timing chain adjustment when doing a valve lash adjustment. All 3 of those should be done at the same time, it is easy and non-invasive (unless you call taking off the valve covers invasive....) Those alone can keep this venerable motor running forever (anecdotally).

    Too many people in the late 70's and mid 80's bought these bikes as toys, for the most part. Play with toy until it breaks, throw it in the corner. Enter today's era, and we are digging out those closets to find that only one or two simple to fix pieces were wrong with toy......and here we are.
    I sure hope it's just one or two simple pieces...that would be great. I don't really understand the "use it till it breaks, and then throw it away" mentality...Like, you paid for it! You might as well get your money's worth.
    '79 CX500 Standard

  6. #15
    Super Moderator CXPHREAK's Avatar
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    Your moneys worth out of one of these {though they didn't know it when new} would have been 50 years or 300,000 miles {whichever came first} if looked after.

    These things don't die, they're murdered.

    I like to find a nice open circuit 5/9 on these when I find a non runner. It likely has only lost spark and been put away.
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    Rebuilding Handlebar Switches

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  7. #16
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    The timing on this issue was bad. I have 3 final exams and a paper next week...oh well. Guess this is going to go slow until the end of next week.

    I plan on just running the bike enough to test my stator (I'm nearly positive it's shot, but just want to verify), and then dropping the engine.
    '79 CX500 Standard

  8. #17
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    Ok, now that I finally have the time to deal with this, I've decided that I'm not going to run the bike more to test the stator. I'm nearly certain it's gone, having spent some time trying to diagnose charging issues in the past, and even if it's not, I want to replace it for my long ride this summer. I also don't want to risk further damaging the engine by running it more.

    As far as doing the triple bypass goes, I found this parts list on Motofaction. Is that accurate? I believe my bike is CDI, so I need a G47 stator. Is there any real difference between the different stators listed on eBay? When I search for "cx500 stator 1979", I get a lot of differently priced things that as far as I can tell, are all the same.

    Also, it seems that I should do the mechanical seal while I'm in there. Is there any seal that won't require reaming out the hole? I do not have the know-how to do that.
    '79 CX500 Standard

  9. #18
    Senior Member nolimitz's Avatar
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    If you can run a drill you can team case. Or shep the seal.
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  10. #19
    Senior Member Shep's Avatar
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    Quote Originally Posted by nolimitz View Post
    If you can run a drill you can team case. Or shep the seal.

    Click here for the in-bike Mech seal replacement.

    CX500 GL500 650 Global ? View topic - In Bike Mechanical seal Replacement




  11. #20
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    Ok, thanks for the info guys. What's the actual procedure for reaming the case? From the little I've read, it sounded like I would need to bring it to a machinist.

    Also, does anyone know if that Motofaction parts list is correct?
    '79 CX500 Standard

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