SOHC.co.uk Forums > CB350/400
Cb400f primary chain noise after big bore kit install
Nurse Julie:
By 500 miles (after oil / filter change, tappets adjusted etc) I was riding my CB400/4 rebuilt engine 'normally' ie, full throttle, high revs. Mine had new pistons / rings / rebore / head skim /primary and cam chain. + a load of other machine work. But, I didn't have any suspicious noises from the engine.
Doom64:
Julie how long have you had your 400? Has it been reliable with the big bore with lots o revs?
Will riding it with this rattle do it any damage? It is quite when riding it's just at idle it's noisy.
Nurse Julie:
My CB400/4 hasn't got a big bore kit fitted, just .50 oversize pistons. I have no rattles at idle or flat out but if I did, I would want to investigate sooner rather than later. These engines usually sound sweet and are not generally known as rattlers.
Doom64:
When you first started the bike after the rebuild did it have any rattles?
When the revs drop the rattle gets worse does this point to the primary chain?
I would of replaced the primary chain while it was apart but because it was quiter before the rebuild I thought it was OK, wasn't expecting it to go loud.
Would the higher compression make a rattle louder or would it make no difference?
Nurse Julie:
--- Quote from: Doom64 on June 29, 2018, 12:38:21 AM ---When you first started the bike after the rebuild did it have any rattles?
When the revs drop the rattle gets worse does this point to the primary chain?
I would of replaced the primary chain while it was apart but because it was quiter before the rebuild I thought it was OK, wasn't expecting it to go loud.
Would the higher compression make a rattle louder or would it make no difference?
--- End quote ---
Nope, first start up after rebuild it didn't have any rattles at all. My old primary chain had about 5k life left in it but only had a very minimal chain rattle at low revs. No idea if higher compression would make the chain rattle louder but logic tells me it shouldn't make a difference.
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