What is this thing???? (clutch)

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Sirspike
Posts: 4
Joined: Tue Oct 26, 2021 12:52 pm
Rides:: Harley sportster, zx7r, dax st50

What is this thing???? (clutch)

Post by Sirspike » Tue Oct 26, 2021 9:00 pm

Hey All,

New to the forum so firstly high!
I'm currently working on a Dax with a C90 engine conversion and unfortunately it's FUBAR!! Well, at least the clutch is. I found a fair few chunks of the clutch outer case laying in the bottom of the engine cover and plenty of shrapnel in the oil when I drained it (don't worry, it's gonna get a good flushing out!).

My problem is this; what clutch is it?? I've searched on CMSNL and a bunch more in other places on Google and I can't find a similar looking clutch outer cover anywhere to replace it with. The engine number is HA02E-231@@@@ and has the 85cc head. I've got a fair idea of the year of the engine thanks to looking through these pages but I'd like to leave that bit over to you all to decide in case I am completely wrong. I am here to learn after-all.

I've attached a photo of it to help and you can see the damage too.

Let me know what you think peeps. If you need more information then please ask and i'll do my best to get it.
Thanks again everyone,
Si
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steveST100
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Re: What is this thing???? (clutch)

Post by steveST100 » Tue Oct 26, 2021 11:46 pm

That clutch is a manual one and not the stock type semi-auto one.


steve g

davebike
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Re: What is this thing???? (clutch)

Post by davebike » Wed Oct 27, 2021 6:50 am

Looks like a pit bike manuel clutch Seen one on a customers bike yearsa go
Have alook chat to OORacing they may be able to help to break like thay itwas proper shit !

Sirspike
Posts: 4
Joined: Tue Oct 26, 2021 12:52 pm
Rides:: Harley sportster, zx7r, dax st50

Re: What is this thing???? (clutch)

Post by Sirspike » Wed Oct 27, 2021 9:05 am

Thanks for the feedback guys. Yeah it must have been poor quality to break like that. There’s no damage to the engine casing so it’s just disintegrated like that!
I’ll look up OORacing, thanks.

Did the later year C90 lumps have manual clutches?

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JohnS
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Re: What is this thing???? (clutch)

Post by JohnS » Wed Oct 27, 2021 9:49 am

No.By manual they mean the clutch had to be operated by a hand lever.All Honda C90 clutches have a foot operation and a centrifugal one.The foot one controlled by the gear-lever,the centrifugal one by the engine speed.
Sorry if I’m telling my grandmother how to suck eggs :D

Sirspike
Posts: 4
Joined: Tue Oct 26, 2021 12:52 pm
Rides:: Harley sportster, zx7r, dax st50

Re: What is this thing???? (clutch)

Post by Sirspike » Wed Oct 27, 2021 11:45 am

Thanks JohnS and no, not all! No eggs sucking here! :D
So I think by accident I MAY have found out this is a CD90 clutch. Had a look on eBay for some alternatives and the one in the picture popped up. Looks very similar eh?
I’m guessing the CD90 had a manual hand operated clutch unlike the C90 (please tell me if I’m wrong)
Does that also mean the engine covers on the semi auto C90T and CD90 were interchangeable??
Right can of worms this!!!
Thanks again for the help peeps
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Alan CF
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Re: What is this thing???? (clutch)

Post by Alan CF » Wed Oct 27, 2021 7:12 pm

The clutch assy was designed to not go over 9000 rpm,
I've seen them come apart like this if it's exceeded,
And it a lighten inner rotor flywheel is fitted.

Sirspike
Posts: 4
Joined: Tue Oct 26, 2021 12:52 pm
Rides:: Harley sportster, zx7r, dax st50

Re: What is this thing???? (clutch)

Post by Sirspike » Thu Oct 28, 2021 10:55 am

Thanks for all the help and insights guys. Really appreciate it. I’ve found a replacement clutch to go on it after following advice here and some more research elsewhere.
Looks like this is a simple manual upgrade that can be bought in individual parts or as a complete kit that includes the clutch, gaskets, engine cover and associated parts.
Thanks again

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