Hi Shwany, Thanks for your reply. On the P11 the points box is behind the right cylinder. The drive for it comes from the contact breaker chain under the timing cover. The rotor with the magnets is screwed onto drive shaft. This has movement in and out, causing the magnets to move further or closer from the stator plate. I figure it's retarding or advancing the spark , depending on whether it's in or out. Uneducated guess, really. I'm getting an itermittent weak spark on the left cylinder,.Where exactly are you installing the Boyer rotor in your scenario?
Usually the Boyer rotor is installed on the timing side end of the cam shaft with all the points hardware and AAU removed from a Commando style timing cover. Play on the end of the cam shaft should not be not enough to upset the ignition in any significant way. Is the Boyer rotor moving in the taper? If so, something isn't right, and I have zero experience making that tight, so won't make up a way to fix it.
I do run Boyer ignition on a P11, but my timing side was modified to support a Commando 2S cam and ignition components. Cam was shimmed for end play. If you have a Commando engine installed in your P11, it would be the same more or less.
If it was side to side play, which yours hasn't, the brush/ shaft has become worn.Hi All, I’m setting up the ignition timing on my P11 and noticed the contact breaker drive shaft has in and out play. I think this may be upsetting the Boyer system. Is this possible and if so, how can I reduce this play?