SOHC.co.uk Forums > CB350/400

Noisy engine 400/4

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McCabe-Thiele (Ted):
I did not hear the whine in the first video but can hear it in the second one now NJ has pointed it out.

What rpm is it doing at idle an extra 50-100 rpm might make it sound a lot better?

sc29:

--- Quote from: Johnwebley on May 27, 2022, 03:16:49 PM ---
--- Quote from: sc29 on May 27, 2022, 03:13:21 PM ---Thanks. I was just looking into carb balancing. I was told once most of the noises are cam chain or carb balancing.  Doesn't look I can balance the carbs myself. Looks like I'll have to take it somewhere.

--- End quote ---
Let us know what area you live in,

Maybe someone close has the kit to sort the carbs

Sent from my SM-A750FN using Tapatalk

--- End quote ---

I'm in North Hampshire Hook area if anyone can recommend an expert around here.

royhall:
Run it in neutral until you hear the rattle, then pull the clutch lever in. Does it change the sound?

400 Cafe Racer:
Hi sc29,

That idle performnce sounds very erratic to me, more like 2 to 3 cylinders doing the work rather than 4. This would cause an oscillation effect on the crank speed and aggravate both timing chain and clutch assembly. (A bit like shaking a tin full of nuts and bolts, rather than just carrying them carefully)

As NJ says, its best to go through all your core settings, ign timing, tappets etc, etc, then make sure the carbs are syncronised correctly, and mixtures correct so that all cylinders are doing equal work at idle. This will smoothen out tickover and make for cleaner performance throughout the range.

Just my observations.

Let us know how you get on. ;)

Dennis

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