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Mark: Clooney and John T are having him check out the mag impulse drive because that gives the mag a "kick" in order to create a spark at low rpm's like cranking or hand turning. At operating rpm, the mag overrides this feature, since the engine speed is adequate to create mag speed to generate the spark. If you pull down a mag driven engine that has an impulse drive, you can begin to hear the mag click as the impulse kicks in to keep the mag spinning fast enough to make spark. In fact, if you put the mag in a vise, and turn the drive lug very slowly, when you get to the point where the mag "indexes" it will release and spin very fast by spring power, and it will spark. That's why on a well tuned 2 cylinder, you don't have to turn it very fast at all to get a good spark and possibly start. So, if the engine won't start at cranking speeds, but will from say belt or pull starting, it could be because the mag is now turning fast enough to make a spark. Frank-in-Tallahassee
70D // 855
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