My 46 chief has the manual advance it was on the right hand grip a couple months ago i switched the advance to the left grip and the throttle to the right side when starting you must set the timing properly or risk injury when you take off you adjust the spark to the rpm to avoid detonation and pinging. The use of automatic spark advance was a step forward but still did not meet all the requirements for optimum combustion a short review combustion starts with a spark at the plug electrodes which if not extinguished develops into what we call a flame kernel. Ignition timing and spark advance adjust or check timing 15 30 return to the econofix home page if you have to advance the ignition timing a lot to make an engine run a wire some you jump a wire between 2 terminals on a connector others you put into diagnostic mode check out the manual for your car the manufacturers have too . The first manual spark advance system was brought out by packard in 1901 for years after drivers controlled spark advance by a lever on the steering wheel hub studebaker pioneered the vacuum advance in 1930 and chrysler installed the first combination vacuum and centrifugal advance unit in 1931
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