Just curious - have anybody tried to fit CBR600RR latest years clutch to CBR400?

I tried to fit a CBR600F1 clutch to a CB-1, as I had discovered that the plates and springs share a part number.

The primary drive ratio is very different though, and I expect you would have the same problem on your proposed swap. What benefit do you seek? The CBR400 clutch is nearly identical to the CBR600F1 clutch (just a different primary gear on the back of it), which had to handle around 85hp-90hp, so it is unlikely to ever prove the weak link in your engine.

amorti wrote:I tried to fit a CBR600F1 clutch to a CB-1, as I had discovered that the plates and springs share a part number.

The primary drive ratio is very different though, and I expect you would have the same problem on your proposed swap. What benefit do you seek? The CBR400 clutch is nearly identical to the CBR600F1 clutch (just a different primary gear on the back of it), which had to handle around 85hp-90hp, so it is unlikely to ever prove the weak link in your engine.

Slipper clutch I think. I'd love to do this on mine as well, but from discussions on here the CBX750 clutch is the way to go for this.

I haven't done it, but next year when i do the engine I'll try it out. Finally getting into rebuilding my wrecked race bike this weekend. Changing the bent frame and swingarm.

Matt

Clutch from a CBX750? Why is that then? Are we both thinking about the cbx750f from about 1984-5? my dad has one of those in pieces in his shed with a dead engine. I rode it before it gave up, don't specifcally remember the clutch being "special"?

Yes, the main point is fit slippery clutch. Has cbx750f slipperry clutch ? I think it's not.

PARUS wrote:Yes, the main point is fit slippery clutch. Has cbx750f slipperry clutch ? I think it's not.

Yep parus, the RC17 which is one of the CBX750 models has got a sprag clutch, just like the NC30, which is a primitive form of slipper clutch. It is however hydraulic and I'm not sure how one would go converting it to cable or fitting a hydraulic cluch to the NC29.

The NC30 sprag clutch certainly helps on the tracks I race on as I have to slip the clutch myself heading into turns, where when I was on a NC30 race bike you could just bang down a gear and there would be a little chirp as the rear wheel locked and then the clutch slipped.

Matt

matt69 wrote:

PARUS wrote:Yes, the main point is fit slippery clutch. Has cbx750f slipperry clutch ? I think it's not.

Yep parus, the RC17 which is one of the CBX750 models has got a sprag clutch, just like the NC30, which is a primitive form of slipper clutch. It is however hydraulic and I'm not sure how one would go converting it to cable or fitting a hydraulic cluch to the NC29.

The NC30 sprag clutch certainly helps on the tracks I race on as I have to slip the clutch myself heading into turns, where when I was on a NC30 race bike you could just bang down a gear and there would be a little chirp as the rear wheel locked and then the clutch slipped.

Matt

Thank Matt for details. I don't know about CBX750 clutch.

As you mentioned NC30 also has sprag clutch does anybody thinking about fitting NC30 clutch? Unfortunatelly there is not too much vfr400 engine to make measurement.

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Thank Matt for details. I don't know about CBX750 clutch.

As you mentioned NC30 also has sprag clutch does anybody thinking about fitting NC30 clutch? Unfortunatelly there is not too much vfr400 engine to make measurement.[/quote]

Parus,

I'm quite sure the NC30 clutch doesn't fit.

Matt

CBX750 can be made to fit ok. Slipper type allowing 3 of 7 to release under hard loading. Hydr to cable convertion easy enuff but you need to fuss a bit. Good hard assy . I suggest use the 750 centre to original 400 housing.

kiwi racer wrote:CBX750 can be made to fit ok. Slipper type allowing 3 of 7 to release under hard loading. Hydr to cable convertion easy enuff but you need to fuss a bit. Good hard assy . I suggest use the 750 centre to original 400 housing.

Thanks Paul, I think you were the person who mentioned this originally.

Matt