Honda-SOHC

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.

Let us know what area you live in,

Maybe someone close has the kit to sort the carbs

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

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.

Thanks I'm veering to some sort of timing or carb issue.  Seems like the noise is some sort of "inbalance" issue. It's a lot quieter when it revs.

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