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Cb400f primary chain noise after big bore kit install

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ka-ja:
The 460 yoshi kit did not alter the "sound" of my motor, but a yoshi camshaft certainly increases camchain wear rate even with a heavy duty cam chain

Nurse Julie:

--- Quote from: Oddjob on June 29, 2018, 01:43:38 PM ---
--- Quote from: Nurse Julie on June 29, 2018, 08:12:30 AM ---
--- 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.

--- End quote ---

Hard to equate your engine with his though Julie, yours was a full engine apart strip with all the chains etc replaced IIRC, his has reused all the chains and that's where most if not all of the noise comes from.
Higher compression shouldn't alter the engine BUT if the engine wasn't running well on the old bores then fixing that problem would mean the engine balance would change, so carbs etc would be out, causing more noise as it's now unbalanced.

--- End quote ---
Yes Ken, that's why it's difficult for me to give Doom a definitive answer to all his questions. Everything inside my engine was new so I would have been most pissed off if I had any rattles of any type from anywhere.

Doom64:
Oddjob, released the cam bolt when? I adjusted the cam chain after the kit was put in and the adjuster bolt was free.
When the new standard pistons were put in the cam chain and tensioner was replaced, also when I put it on the dyno it made 30hp at the rear wheel so it was running decent when it was standard.

Nurse Julie:
Out of interest, what other mods have you done to the bike to make you want it dyno tested? Pods, different jets or anything like that. I still think it's the primary chain though.

Doom64:
I dyno tested it before I put the big bore kit in it.
Everything was standard apart from a shorter silencer and electronic ignition.

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