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Posted by Bucko
- October 27, 2014, 00:21:59 AMWhat's the advantage of a wasted spark system on a V twin? I guess it makes timing simple (no need to divide cranks rotations to time to the compression stroke - that could be easily done by the ECU), but is that the only reason? Makes all sorts of sense for a inline 4 - reduces the number of coils required by 2 but that doesn't apply to a v twin.
Posted by scamp62
- October 26, 2014, 20:47:20 PMThen is the Drifter considered a dual fire ignition ?
Posted by Troll
- October 26, 2014, 18:16:43 PMTapping both coils will likely keep the engine from starting at all, since each signal wire is actually the ground for the coil. Most tachs, at least they used to, have an adjustment on them for # of cylinders. When installing a tach on a Harley with single fire ignition, a special filter is required to get a reading from the coil. I'll bet that the waste spark system on an 800, using only 1 coil per cylinder, will signal on both the exhaust and power strokes, so there will be no issues with the tach reading 1/2 rpm...
Posted by scamp62
- October 26, 2014, 18:03:00 PMA little help from the brain trust out there please !
Installing an electronic tachometer on my 800. The question I have is there is a single engine signal line that is to go to the coil, is going to one coil going to give me a true reading, or should there be a line to both coils 
Any advice would be greatly appreciated.