Question about Honda CB 500 Motorcycles

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I have purchasted a honda cb450 and as it has been off the road for 6years or more have had to strip and clean the carbs.my problem is that the mixture in one cylinder is too ritch although the needles are set at the same height and I cannot seem to balance the carbs.can you advise the following information. main jet size/needle settings/air screw and throttle settings and any advice you can give on balancing bearing in mind there are no connections on this model to use vacuum gauges.

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  • johnston707 Sep 02, 2010

    by intake valves are you refering to the inlet valves in the cylinder head ?.the float levels are set at 14mm above the bodies with the carbs inverted.my main problem is the position of the needles as these are retained by a grub screw and are not marked.also I need to check the size of the main jets.

  • johnston707 Sep 06, 2010

    thank you for your reply and I have noted your comments, I feel however that the previous owner may have altered the needle positions and possibly the float heights. I have reset the float heights at 14mm above the carb bodies with the cabs inverted as stated in haynes manual but they do not give any advice on the needle position.htis engine is fitted with CV carbs,and the needles secured by a grub screw through the side of the diaphram,no notches on needle.
    when you refer to intake valves I assume you are refering to the inlet valves in the cylinder head.

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  • Honda Master
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Why would the jet size change?, No U have a problem with the carb, dried gas can be very difficult to remove, also if u used a strong carb dip to clean the carbs one of the jet passage block off balls may have come out

Posted on Sep 02, 2010

  • yadayada
    yadayada Sep 06, 2010

    needle valve position is not listed because it should never be altered, if it was there will be shims to bring them up higher, so there is no spec.

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  • Honda Master
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First of all you should make absolutely sure that the intake valve seals shut and the float height / fuel level is correctly adjusted in the problem carb.
All components (especially the jets and the needle) must be identical in both carbs check them to be sure. If some parts look worn out replace them with new ones
http://cgi.ebay.com/ebaymotors/TWO-Honda-CB450-Carb-Rebuild-Kits-Keyster-Kit-CB-450-/110571785511
Use the carb that runs just fine as a base and start adjusting - first lower the needle a notch, then raise the air screw but lower the valve.
BTW you can use a flow meter to balance the carbs, all you need to do is to take the airbox out of the frame.

Posted on Sep 01, 2010

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