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Old Yesterday, 05:26 AM   #1
footdragger OP
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Joined: Jul 2014
Oddometer: 23
CBR1000f Alternator damper - Why and what???

Ok so I've just found that my bike wasn't starting because of this damned thing.

The alternator damper is a miniature multi disk wet clutch, exactly like the one that drives the primary transmission shaft.

It's described as a damper, it is NOT a 1-way clutch like a starter clutch.

Once it loses friction, the starter motor spins and the engine does nothing.

Why the hell is this part necessary? Why would the alternator rotor need to be cushioned? Can I safely disable this "feature".

This is a very common issue with this model. Way to go, Honda.
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Old Yesterday, 02:20 PM   #2
Alexander B
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Joined: Apr 2013
Location: Sweden
Oddometer: 234
I have never worked on a bike like yours.
Is there no other function, like a free wheel coupling or similar?
Could it be there to protect the crank in case of some dramatic alternator failure or a low-sider?
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Old Yesterday, 02:25 PM   #3
footdragger OP
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Joined: Jul 2014
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It's not a freewheel connection. It is a wet clutch like in your transmission and always engaged due to the pressure springs. I just don't understand why you would need to dampen anything here...
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Old Yesterday, 02:46 PM   #4
Alexander B
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Joined: Apr 2013
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If it wears out - like you indicate - it must indeed be slipping occasionally?
Is the flywheel/rotor heavy? A clutch would offer a possibility for the crank to accelerate or decelerate more rapidly at momentary bursts, (without the inertia of the rotor), while maintaning a larger mass for a steadier idle.

But is it correct that your starter motor is also transferring through this clutch, or was it only as an example?
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Old Yesterday, 03:10 PM   #5
footdragger OP
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Joined: Jul 2014
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Haha you're right, that makes sense. Lighten the resistance under acceleration. Great to know!

Yes! The damn starter turns the alternator which turns the damper which turns the crank. Honda thought they'd be brilliant and use the alternator as a sort of reduction gear to save one part.

That means once the damper gets a little weak, no starty...

Thanks dude that makes sense. Now I feel comfortable clamping the bastard tight with an extra shim!
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