Did you know that the Honda CB450KO Black Bomber was the first double overhead motorcycle in the world to go into volume production? Nothing to do with valve stem seals, but if you are removing and replacing you valves these will need renewing. If you are unsure of the other parts you need for that perfect engine build, or complete restoration, check out our on line 'parts list' fiche, you will be amazed at just what is still available from stock for your CB or CL 450 and CB500T
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