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1965-70 XL Sportsters came with a advance/retard for the magneto. You controled it with the left grip just like the r/h throttle grip for the carb. (internal cables) Guys with chopper bars would put a small spring on the control arm to hold it advanced but still allow it to be retarded for start up. J&P cycles still sells replacement parts for the XL set up. The Sporty base(gear drive) and the main body were two seperate units and Big Twin mags are one piece. Unless someone is making an aftermarket adv/retard Mag for big twins, your out of luck. I ran a Hunt Mag on a 86 inch Hi Compression Pan locked in at full advance and it was a Nightmare!! I only weighed 145#, busted my shin bone and took several trips Over The Bars! You could always pick out the Sporty guys with Mags buy the fact they All Limped around. I soon went back to a distributor.
 
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