Z25 Gear and Shaft Replacement - Page 15
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Thread: Z25 Gear and Shaft Replacement

  1. #141
    Senior Member Rick67's Avatar
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    That seems to be the complete opposite of Cam's issue ..
    I would definitely extract that bearing to see what's going on . And fix it sharpish .
    As Errol has mentioned a few posts back 🙂 .
    Hopefully it's just a case of a washer or new thicker bearing ..
    I'll be watching this one as well . Cams fix was a beaut !

  2. #142
    GBo
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    I already have the bearing out. There is no step. A washer or thicker bearing won’t work. There needs to be a stop behind the bearing. The only way it could be done is to cut lateral grooves and fit some sort of double stepped key which would have to be under the circlip groove. Any other ideas more than welcome. There is a cover over the top of the spray clutch has anyone removed it to see what’s under there?

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    Quote Originally Posted by GBo View Post
    You are spot on Rick. The alternator end bearing has a circlip on the outer end and nothing inner end so the bearing can move and the z25 is allowed to touch the clutch gear.
    Any evidence of the retaining lip having been been broken out by a previous owner? Hard to believe it came off the production line like that.

    Loctiting the bearing in the appropriate location would probably work ok, otherwise the cases will have to come apart for some kind of lip to be added,

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  5. #144
    GBo
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    Quote Originally Posted by mikerj View Post
    Any evidence of the retaining lip having been been broken out by a previous owner? Hard to believe it came off the production line like that.

    Loctiting the bearing in the appropriate location would probably work ok, otherwise the cases will have to come apart for some kind of lip to be added,
    That’s the thing no evidence of a ring. The inner edge feels rough though. I’m guessing badly aligned alternator coupling when fitting.

  6. #145
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    A spacer on the shaft between the sprag clutch and bearing should sop the bearing moving inwards.

  7. #146
    GBo
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    I think the bearing is sandwiched between the alternator coupling and the sprag clutch and the whole lot is moving so I don’t think a spacer would work.

  8. #147
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    Yes, you're probably right. The bearing on the other end of the shaft is a needle roller, so there's no axial fixing there.

    I suspect the only proper fix for your bike is to pull the thing apart, build up the shoulder with weld and re-machine the bearing housing. In the meantime, some Loctite 603 bearing retainer will probably hold it in place. Even if I doesn't, the thing can only move as far as the clutch will let it. Once the Z25 gear hits the back of the clutch, it can't go any further. But I doubt it will cause any carnage. My Z25 gear had evidently been touching the back of the clutch for some time without doing any harm. There were just some faint rubbing marks on the gear.

  9. #148
    Senior Member Rick67's Avatar
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    bearing fix

    i have an idea but its not conventional...........
    there is a possibility of drilling through the engine casing from above the affected site into the bearing case slightly with care obviously... to create a small indentation for a locating a pin/bolt from the hole drilled above.
    yes you'll need to be careful and their will be some tapping of threads involved for a secure fix plus a copper washer for an oil seal . i`m guessing that a bearing fix compound will also be needed for peace of mind.
    the pin/bolt tip would only need to be a locating device that exerts no pressure onto the bearing outer towards the centre.

  10. #149
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    That could work, depending what access from above is like. I haven't had that cover off so can't confirm whether it's do-able or not.

    God luck drilling a locating hole in the outer bearing casing. I'd suggest grinding an indent.
    Rick67 likes this.

  11. #150
    Senior Member Rick67's Avatar
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    I'm liking the grinder slot for the bolt head ..
    Quote Originally Posted by Sprocket View Post
    That could work, depending what access from above is like. I haven't had that cover off so can't confirm whether it's do-able or not.

    God luck drilling a locating hole in the outer bearing casing. I'd suggest grinding an indent.
    Here's the drill site as you can see it's a bit unconventional from outside but... It could work .
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