Ensure your Classic CB Four receives its ignition spark at the correct moment, by fitting a new genuine Honda contact breaker assembly. If you are still running the original assembly, it's importantly close fit, will by now be a little loose, affecting the ignition timing, and giving generally lower performance than it should. Don't forget you will need the other contact breaker assembly -300-154 as well, if you wish to renew the complete system. To ensure you have all the parts you need for a satisfactory conclusion to the work in hand, check out the online catalogue, or where applicable the online 'parts list' fiche for your model.
