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Author Topic: CB400T Surging  (Read 866 times)

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Offline KB02

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CB400T Surging
« on: August 23, 2008, 03:05:26 AM »
So, While I wait for work to be done on my Ducati, I have been riding my Wife's 400 Twin (Honda CB400t, 1978, Hawk). I have noticed that it has a surge to it as you ride down the road. It feels like something in the drive line. If I put the bike on the center stand, I can spin the rear wheel and I notice no tight spots on the chain, The rear wheel spins true and doesn't seem to out of round or anything. The rear sprocket looks to be fine. Where else should I look on this?
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Offline tonycb650

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Re: CB400T Surging
« Reply #1 on: August 23, 2008, 10:11:57 PM »
May be a front brake problem (warped disc?).
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Offline kirkn

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Re: CB400T Surging
« Reply #2 on: August 24, 2008, 09:09:07 AM »
If you pull in the clutch at speed and coast, does the surge go away?  That'd confirm if its in the engine vs. a driveline issue.

Otherwise, check the same out-of-round or out-of-true for the front wheel.

That's about all I can think of without a better description of the symptoms.

Kirk
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