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Author Topic: Cdn Nighthawk S Clutch vs US Clutch  (Read 3859 times)
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« on: July 15, 2010, 11:18:58 AM »

As some of you are aware, one of the differences between the Canadian and US Nighthawk S is the clutch. I've been meaning for sometime to demonstrate this difference on the forum and now I have some time to do so.

Please note that even my Canadian CB750SC manual has the US CB700SC clutch in it. It contains no information about the Cdn clutch. The photo below was a print out given to me by my local Honda dealer. And as far as I know, this info is not available publicly...like on the net or in other manuals.

Here is a shot of the US clutch taken from the Honda manual


Here is a shot of the Canadian clutch taken from my local Honda dealers parts fiche


I've also attached a link to the full size documents in PDF. Click here to open full size in PDF.

Differences?
The main difference it the outer plate lifter that holds the plates in place is different. There are others...can you see them?

I do know that the plates are compatible, as I've had some friends purchase plates from US distributors and successfully installed them in their CDN NH S.

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Jeff
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« Reply #1 on: July 15, 2010, 12:06:40 PM »

From those pics the US version looks way less complicated. Wonder what their motivation on making them different was.
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gammer Topic starter
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« Reply #2 on: July 15, 2010, 12:10:08 PM »

Not sure?  scratcher
When I took my clutch apart last night it came out very easily. Remove the C-Clip (#21) and remove the clutch lifter plate (#12) and remove the nut holding all together (#17).

Someone on here once suggested that the gearing ratio's might be different between the two bikes. The next time I go into the Honda dealer here, I will get a printout of the transmission and compare part numbers.
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« Reply #3 on: July 15, 2010, 12:33:21 PM »

The US version, you remove the 5 bolts going through the springs (only 1 shown in the diagram) and everything but the center part and basket comes out.
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« Reply #4 on: July 15, 2010, 09:28:35 PM »

The canadian clutch was designed to handle the extra weight of a 30 pack of beer and a slab of moose ribs. poke


 rollinglaugh
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« Reply #5 on: July 16, 2010, 07:23:52 AM »

The canadian clutch was designed to handle the extra weight of a 30 pack of beer and a slab of moose ribs. poke
 rollinglaugh

Darn right it was, plus we could handle the added complexity  poke now where did that slab of ribs run off to..
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« Reply #6 on: July 16, 2010, 02:18:44 PM »

Darn right it was, plus we could handle the added complexity

Shhhh, quiet. If they know how smart we are, they might offer us jobs at a good pay and force us to move to the USA to work...like all the other folks around here who are affected by the 'brain drain'
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gammer Topic starter
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« Reply #7 on: August 05, 2010, 07:06:15 AM »

To  ontopic, I've done some research and found that the clutch used in the US Nighthawk S, was only used in that engine (RC20).
The clutch used in the CDN Nighthawk S, was used in all those 750 (RC17) engines around the globe.
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« Reply #8 on: January 12, 2013, 09:47:26 PM »

The global clutch has an overrunning clutch inside it.  There are 2 or three plates that are solid.  The rest go through the overrunning clutch.  That means that the majority of the plates only drive forward.  If you downshift into first, they do not hold back anything.  The few solid disks will slip so the rear wheel won't lock up and loose control.  Because of this, I cannot push start the bike.

 US riders are allowed to drag the back wheel and wipe out.

BP
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« Reply #9 on: January 12, 2013, 10:53:36 PM »

The term is a slipper clutch. I wonder why they didn't want it in the US?
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« Reply #10 on: February 21, 2013, 09:14:07 AM »

Because of this, I cannot push start the bike.

+1
When I was running this style clutch I noticed I could not push start the bike. I am now running the US style clutch, which I've posted about in another thread. My main reason for converting was because I started getting clutch slippage after doing the cam timing mod. So I opted for the US style because I could get stiffer clutch springs.
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Jeff
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