SOHC.co.uk Forums > CB350/400

Noisy engine 400/4

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sc29:
My 400/4 seems to have developed this knocking at tickover. I was just about to try and adjust the cam chain, following some instructions I'd read about removing the bolt above the cam chain tensioner bolt and pushing a screw driver in to do the work of the springs, and I couldn't remove it.  My socket extension wasn't long enough so I need to get a longer one if I'm going to do that.

Anyway, before doing that I convinced myself the noise wasn't the cam chain. It seems to come from that area under the carburettors. I just wondered whether anyone had any ideas what might be causing it and whether it needs a major overhaul. Here's a link to a recording I made https://youtu.be/ENf3vm9v_BE

paul G:
I would try a Carb balance first  ;)

Johnwebley:
Most of the sohc bikes rattle at tickover,

Normally it is clutch rattling,

Check the tappets, plugs,

And see about synchronise the carbs

Sent from my SM-A750FN using Tapatalk

McCabe-Thiele (Ted):
I would also check the timing for 1/4 & 2/3 as a starting point then go for Pauls suggestion on carb balancing.

I don't like the idea of pushing down from the top cap bolt of the tensioner sytem unless it will somehow move a partially  seized horseshoe. I agree it does not sound like the cam chain more of an inbalance between the cylinders at low revs.

More experienced members might add to the possible cause of the noise.

sc29:
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.

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