Posted by John T on January 25, 2010 at 14:15:09 from (71.52.8.83):
In Reply to: Points opening specs?? posted by ryanwheelock on January 25, 2010 at 08:16:06:
Ryan, This is more info then you wanted and many people never heard of it and the readily obtainable specs as listed below will get you in the ballpark and she will run fine. HOWEVER if youre a perfectionist and want to realize the absolute maximum spark energy available from a magneto, adjusting points using whats called the edge gap method is best as the listed specs are often only an approximation of what the points gap SHOULD BE if all is well and correct and theres not yet any wear and tear and slop, in which case that X amount of points gap yields the same as using the edge gap method of adjusting points, BUT NOT NECESSARILY SO AS A MAG BEGINS TO SHOWS ITS AGE.
How it works is there is a precise short distance after which the rotor magnets have exited the laminations WHEN THE COIL CURRENT IS AT ITS ABSOLUTE MAXIMUM and its precisely then the points should break open. What a person does is use a tool or jig to hold the rotor at that precise location then slowlyyyyyyyyyyyy open the points adjustment to stop JUST WHEN THEY BREAK OPEN. Before the points rubbing block is worn down and the bushings arent overly worn that condition is approximated by setting the gap to that typical 0.020 to.022 etc.
A friend of mine recently deceased was a retired Nuclear Physicist who had the time equipment and know how to set his that way and then had equipment to measure the results and he and I always had fun discussing this topic. He used to give a Mag seminar at Gathering of the Green prior to my giving them and I told my people heres the mag specs and what to adjust the points at BUT if youre NERD heres how Duane adjusts them lol then tell them how to use the edge gap method.
Sorry I dont have the FM manual but Bob there has ya covered on that and perhaps it describes how its done on those FM Mags
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