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creedxup
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PostPosted: Sun Jun 19, 2022 9:56 pm    Post subject: Reply with quote

Goshreally2 wrote:
In my search for a decent clutch boss for my genesis I have been looking at exup, yzf 750 and thunderace. Anyway, don,t mean to confuse the alignment mark issue on thunderace but if you look at ebay item number 114891628974 it shows a complete item and there are alignment marks on the left of the housing in the picture. I can,t see a plate notch but the clutch is out and probably not aligned after removal. I have bought quite a few parts from this seller and they are always good, what he says they are and well priced. I have phoned him before and he is a reasonable individual so he could probably answer your question as he will have seen a number of these.


Ah yes, I see them, they’re on the bottom of the cutout for the tang, not on the outside ends, they’re at the 8 o’clock position on the photo.

Regardless, if it was me I’d just try some heavy duty springs and see how it goes 👍
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Goshreally2
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PostPosted: Sun Jun 19, 2022 10:01 pm    Post subject: Reply with quote

I think you are right. Springs are the best and probably cheapest way to go first.
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jcr
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PostPosted: Mon Jun 20, 2022 9:25 am    Post subject: Reply with quote

you have excellent eyes Goshreally2.
ive emailed my nearest dealer and theyve quoted £144 for friction plates and springs.
theres 8 plates part no 4H7163210200 and 1 plate 3GM163210000 which is a few quid dearer.

given that my plates and springs are 26 years old. i think i might just replace the lot, for peace of mind.

thanks for taking the time to help.
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creedxup
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PostPosted: Mon Jun 20, 2022 3:39 pm    Post subject: Reply with quote

That’s not a bad price for genuine 👍
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nuggitt
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PostPosted: Mon Jun 20, 2022 7:36 pm    Post subject: Reply with quote

I think I need to book in at Specsavers. Are we talking these marks? laugh laugh


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Goshreally2
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PostPosted: Mon Jun 20, 2022 8:27 pm    Post subject: Reply with quote

If you go up about 1 cm from the tip of the arrow in your picture you will be at the point where the housing bulges out. There at two raised dots on the top lip of the bulge. If you hover over the ebay picture it picks them up much better. It seems these marks appear on genesis, exup and thunderace. If you have a Haynes manual for genesis and exup it seems its they have the clutch right. The diagram in the Haynes manual that shows these dots is on page 3.26 diagram 19.24. if you buy an ebc clutch kit they do away with the plate spring but have an alignment notch on the outermost friction plate. I suspect most aftermarket kits do this as the plate spring leaves really nasty marks in the boss. I will say I had drag issues with ebc plates and refitted my old set and one ebc plate - but I took the edges off the ebc friction plate tang slightly to help it move in the housing. If I was to refit another clutch set it would probably be a surflex. I am still looking for a good condition boss - over to classifieds.
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YAMAEXUP
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PostPosted: Mon Jun 20, 2022 10:36 pm    Post subject: Reply with quote

I fitted Barnett heavier clutch springs to my Exup-R not long after buying it back in '93. I also bought OEM friction plates, soaked them in engine oil & awaited the time when I would need to install them....& that was 55k miles ago.
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nuggitt
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PostPosted: Tue Jun 21, 2022 8:02 am    Post subject: Reply with quote

Don't worry I'll catch up in a minute.

Are these the marks? laugh


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nuggitt
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PostPosted: Tue Jun 21, 2022 8:22 am    Post subject: Reply with quote

I think I've got them?


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jcr
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PostPosted: Tue Jun 21, 2022 9:09 am    Post subject: Reply with quote

nuggitt wrote:
Don't worry I'll catch up in a minute.

Are these the marks? laugh



not quite nuggit. if you look at the black hole just below your arrows, that is oval shaped in the pic. where the friction plate edges slot. theres a tiny circle mark each side of the ridge at the base of the hole.
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nuggitt
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PostPosted: Tue Jun 21, 2022 9:18 am    Post subject: Reply with quote

Third time lucky. I hope.


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Goshreally2
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PostPosted: Tue Jun 21, 2022 12:20 pm    Post subject: Reply with quote

Yes that's them.
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nuggitt
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PostPosted: Tue Jun 21, 2022 8:31 pm    Post subject: Reply with quote

Got there in the end. When the day comes to change my clutch plates. I now have a bit more knowledge of how to do it and what to look for. At the moment there isn’t any signs of clutch slip. Touchwood. 😁👍
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jcr
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PostPosted: Tue Jun 28, 2022 6:03 pm    Post subject: Reply with quote

an update for anyone whos interested.

the friction plates arrived today. the final plate is half a millimetre thicker than the rest, 3.5 as opposed to 3.0 mm. it also has one of its tangs marked with dark ink on the outer edge. i cant see any difference in the plate where the mark is, but i will line it up with the marks on the basket, just to be safe.

im guessing the plates have had an update since the bike came out, because all the old friction plates that i took out, were the same thickness.
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nuggitt
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PostPosted: Tue Jun 28, 2022 7:14 pm    Post subject: Reply with quote

I’m really interested. I may need all this info when the day comes to do my clutch. Keep the info coming please. 😁👍
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