Z50 clutch rebuild advice

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Z50 clutch rebuild advice

This is a discussion on Z50 clutch rebuild advice within the Z50, CT70 and JDM Monkeybikes forums, part of the General Talk category; Can anyone point me to some good videos, manuals or ancient scrolls explaining how to rebuild a 1973 z50 clutch? Apparently all the fun we ...

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    Z50 clutch rebuild advice

    Can anyone point me to some good videos, manuals or ancient scrolls explaining how to rebuild a 1973 z50 clutch? Apparently all the fun we had last night might have ended the clutch. I'm not 100% sure if it is finished as the pieces came apart when I took the clutch cover off, so I need to do some learning.
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    Here's a great video: https://youtu.be/D9DyeetblGU

    Certain parts will fall off normally when you open the right side cover unless you have the engine on its side.

    What makes you think the clutch shot?


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    I'm not sure if the clutch has failed...but it was making a rattling noise while idling when you leaned the bike to the right, and now it either slips or is locked when you try to kick start it.

    When I took the clutch cover off, the adjuster parts that are fastened to the cover were loose and just fell out...not sure if this is normal. Figured I would take it all apart and have a look. Video is perfect though, thanks.

    Any ideas what the problem could be?

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    Was there a nut on the outside of the clutch cover on the adjuster stud before you removed the cover? If not, that may very well have been the cause for the rattle. You don't have to remove that jamnut to take off the clutch cover.
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    There was...and after watching the video, I think all the parts are there. Everything was locked up as I tried to take the 3 screws out for the clutch cover, then what looks a sheared pin fell out of the flywheel side and it is spinning again. Broken metal bits falling out of an engine can't be a good sign...anyone know where this pin might be from?
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    Sheared off at the small end? How big is it in comparison to one of the three countersunk philips screws from the clutch cover?
    Maybe lay out all the clutch parts from the 3-screw cover to the retainer (part #17, below) and post a pic of those parts to see if anything is missing or broken.

    http://shop.discounthondaparts.com/f...71&fveh=192455
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    Also check and see if this rivet is in place

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    I have not been able to get the clutch cover with the 3 small phillips screws off yet...those screws are in tight and I feel like I will strip them if I force any harder.

    As for the clutch parts that are off so far, they all appear to be present and ok according to the drawing and the video... including the rivet you can see in this pic that gives some size perspective.

    The sheared pin seemed to come out of the flywheel side. I have the engine on its side flywheel facing down...so I can work on the clutch cover and those 3 screws. At first the flywheel was stuck, but as I started working on those screws it broke loose and that's when the pin came out.
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    Z50 clutch rebuild advice

    dpranno I ran into the same problem when trying to remove those screws also.

    If you have the motor on a stand and have a Harbor Freight nearby, pick up a Impact Screw Driver.


    Two of the screws were so tight I had to heat them with a torch then spray them with some PB Blast before the impact screwdriver would work on them.
    Last edited by jamesfl; 04-08-2017 at 02:31 PM.

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    Z50 clutch rebuild advice


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    Managed to brute force then off with no screw damage. So this is what the plates look like, and I am confused because it does not match with the video or the diagram from CHP.

    My middle plate (#9 is the diagram) is friction on both sides, but the diagram and the video show a steel plate only. Also, both of my friction plates have material only on one side...is this right?
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    Yes, there are two sets of plates that you can use in these clutches, below is the diagram showing the plates you have from a '73 CT70

    DiscountHondaParts.com, Honda, Polaris, KTM, Ski-Doo, Motorcycle, ATV, Snowmobile, Parts and Accessories.
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    Part #C181 on the CHP CT70 page
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    Thanks for the insight...so replacing these 3 with the 3 from CHP will work?

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    Yes, the CHP Kit #181 has the center plate with fiber on both sides, and the two end plates each have fiber on one side only
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