Re: Boyer Ignition

Posted by hendred on Jan 10, 2014; 5:40pm
URL: http://silk-motorcycles.221.s1.nabble.com/Boyer-Ignition-tp5000987p5000988.html

I was looking at the Pazon Altair system for my Silk as it looks like there is little work to make the rotor fit in the space available.  I contacted Pazon to get the dimensions and asked about the advance curve for their units.  It seems they are at full advance at about 3000 rpm on a 4 stroke which translates to 1500 rpm on the camshaft.  Fitting the unit on the crankshaft of a Silk means that the unit would achieve full advance at 1500 rpm which is not much above my idle speed.  I also looked at programmable advance control boxes to get a better advance curve, just started to get too complicated at this point and as my original Lumenition system is working ok I left it there.  

From what I can make of it, there seem to be two types of mechanical advance units originally fitted to Silks; one with a single bronze bobweight and one with two light alloy bobweights very similar to the units on Triumph twins and Norton Commandos.  Is this correct and do the twin alloy bobweights fail as well as the bronze ones?  My Silk has twin alloy bobweights.    

If my unit fails I think I will make new bobweights and fit a modern Lumenition system - if it lasts another 34 years that will do me!