SOHC.co.uk Forums > CB350/400

Cb400f primary chain noise after big bore kit install

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Nurse Julie:

--- Quote from: Doom64 on June 29, 2018, 06:20:50 PM ---I dyno tested it before I put the big bore kit in it.
Everything was standard apart from a shorter silencer and electronic ignition.

--- End quote ---
So is it just the big bore kit, short silencer and electronic ignition you have now?

Doom64:
Yes I still have those and the head has been skimmed now that's the only difference.

Nurse Julie:
So really then it most probably is the primary chain but as none of us including yourself has got a crystal ball or x-ray vision, the only sure way to diagnose the problem is to strip the engine right down. It still may be something else but you won't know until you take the engine apart.

Doom64:
Someone else done it before and said it was within spec.
I balanced the carbs again today, took it for a spin and it does seem a lot quiter than it was before, it's back to how it was with the standard kit in it thankfully.
I will probably strip it down again winter time and do the bottom end, this was the first engine work I have done and the bottom end is a bit trickier isn't it?

hairygit:

--- Quote from: Doom64 on July 01, 2018, 06:59:05 PM ---Someone else done it before and said it was within spec.
I balanced the carbs again today, took it for a spin and it does seem a lot quiter than it was before, it's back to how it was with the standard kit in it thankfully.
I will probably strip it down again winter time and do the bottom end, this was the first engine work I have done and the bottom end is a bit trickier isn't it?

--- End quote ---
  It's especially important with these older bikes that you learn to do the work yourself, or only entrust it to someone with plenty of experience of older Honda's. Also, as you progress with ownership, don't assume just because a part is new it can't be faulty, they can, and people spend hours chasing their own tails trying to find the problem without checking the new part is fit for purpose! Glad you got it sorted, as I said at the start of this thread, it was the most likely suspect. Enjoy riding it.

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