Clutch differences for 900RRs - Honda Motorcycles - FireBlades.org
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post #1 of 3 Old 06-03-2017, 5:29 AM Thread Starter
 
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Clutch differences for 900RRs

Hi all,

Whilst writing this post I think I've found the answer to my question but here goes - a while ago I changed the engine in my buggy for 'the same' type of CBR900RRW. The original started SC33E (hard to make out but I think that's right, see pic). The new engine is SC28E (see other pic). A quick google tells me that the SC28 is a 92 and the SC33 is later, possibly 96 so they aren't the same!

Old engine:




New engine:



The problem I have is that I went to fit my Barnett clutch from the previous engine and it doesn't fit. There appears to have been a change to the depth of the clutch basket:

Depth of inner basket (old engine, 96) ~51mm:





Depth of inner basket (new engine, 92) ~47mm:



Depth of outside (old engine, 96) ~53mm:






Depth of outside (new engine, 92) ~62mm:



So this manifests as an inability to put all the clutch plates in (2 friction plates and 2 steels left over). I tried building it up with 4 less plates but it slips badly. So my questions really are:

1. Can I change over the basket somehow or will that then foul on the cover/cause other issues
2. A lot of people list clutch items covering 92-97, are they wrong? I'm assuming I actually need this:

BARNETT BIKE CLUTCH KIT FITS HONDA CBR900 RR 1992-1995 | eBay

3. Any other ideas for how I can move forward with the clutch I have? I think the stock clutch had less plates than the Barnett hence the thought I could just match up that way but apprently not?

Thanks

James

Last edited by jseaman; 06-03-2017 at 5:34 AM.
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post #2 of 3 Old 06-03-2017, 5:50 AM
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Re: Clutch differences for 900RRs

92-95 all SC28 = 893cc

96-99 all SC33 = 919cc

There were subtle changes throughout the series, and the clutches were one of them.

You can't swap the baskets.

The SC28 has the damping gear attached to the back of basket

The SC33 has it attached to the crank.

I would suggest that clutch kit for the 92-95 RRN-RRS.

My 99 900RR Track Build Link:Track Build 900RRX

My Red Rocker 93 Build Link: Café 900RRP

Last edited by IanDoohan; 06-03-2017 at 3:34 PM. Reason: Oops on the cc's
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post #3 of 3 Old 06-03-2017, 6:57 AM Thread Starter
 
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Re: Clutch differences for 900RRs

Brilliant, thank you for the confirmation - I'll get one ordered

Thanks for the help as always
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