SOHC.co.uk Forums > CB350/400

IDLE PROBLEMS CB400/4

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K2-K6:
It'll be interesting if you find what's giving the problems. As you say we've thought along the same lines.

Have you checked the resistance of the plug caps to see if they're ok, also you could try it on a higher octane fuel if it's on std.

My mastermind specialisation would probably be something like VAG group passenger car diesel engine oil specifications from the period 2000 to 2008  ;D
Yeh,  I know I need to get out more but my household to-do list is so long that I need a bike to get from one end to the other of it  :(

royhall:
One of my bikes had an idle problem. Part of the problem (but not the only one) was using resister plug caps and resister plugs. This doubles the resistance and caused part of my problem. Silvers website specify the resister plugs so the problem may be widespread. Sorry to say, the other part of the problem was an air leak at the isolator rubbers, and it caused an identical problem to yours......... On a side note I have always used NGK plugs until recently. A friend of mine said to try Denso plugs, and they make a significant difference to the running and idling on all my old bikes. I am told Honda specify Denso plugs as standard, but not sure that is true.

Nurse Julie:
Thanks both Roy and K2-K6, your thoughts give me more things to try.

Orcade-Ian:
I tracked down air leaks on my old Brit stuff using 'easy start' - any leaks of unmetered air on the inlet side show up with a corresponding increase in revs.  I also used it to good effect very recently on the supercharger elbow seals on my Daimler when all else had failed to find the rough running - there is a heck of a lot of potentially troublesome pipes in that there engine bay!
I also found a flattened o ring on one intake rubber (carb to head) on the 350/4 a few years ago.
I have never tried it on inlet valves on these fours and apart from getting splashed with hot oil, might work with a tappet cap off and a squirt of easy start aimed at the spring area.
Be careful though - it's very volatile and an old farmer friend used to say 'don't use it too often, them engines can get to depend on it!'
Not sure of any long term damage to rubber components - perhaps Ash might know better?
Ian

Nurse Julie:
Thanks Ian
I will add that to the list of things to try.

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