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Message: <blockquote data-quote="ekvh" data-source="post: 100775" data-attributes="member: 1179"><p>I think the three sparks has merit. I also think upgraded coils provide ample spark, even with the waste spark. I thought I read that the reason for waste spark systems was to help keep the coils cooler as they would get too warm at idle waiting to spark again. Nowadays, computers can decide when the coil should be energized. I tend to be in the "floppy timing belt" camp as a reason for the uneven idle of early wings. Turning the motor over slowly shows the belts getting slack a bit as valve springs work. The three sparks give them a better chance of firing at the appropriate time.   The 1100's and 1200's have the  timing on the crank. The problem with the 12's is the black boxes are becoming more and more rare, and the box controls timing.</p></blockquote><p></p>