The engine is of course a 4 cylinder 4 stroke:
Intake
Compression
Power
Exhaust
The firing order is 1-2-4-3.
The stock 1981 GS1000 uses two pickup coils on the right side of the engine that are triggered by a single tooth piece that is on the crankshaft end. The tooth changes from 17 degrees Before Top Dead Center (BTDC) at less than 1500 RPM to 37 degrees BTDC over 2350 RPM (shop manual specs). The pickups have three wires- one to each coil, and a common ground wire. These wires go to the ignitor box, which controls the coils.
From what I can deduce, as the tooth lines up with the rear coil (1-4), this is 17 degrees BTDC for those pistons. 180 degrees of crank rotation later, and the tooth lines up with the front (2-3) coil.
My question:
Is #1's power stroke #4's intake stroke and vice-versa? Based on the cam lobes and from what I've read about wasted spark, I think this is the correct answer.
I'll throw a wrench in here in that I have segreated the pickup coil wiring for the Microsquirt so each coil is independent, but the physical movement of the engine is the same. I have not yet figured out via the software to allow my 4 cylinder engine to run as two 2 cylinder engines, so I'm researching how the original system operates. The MS has two ignition inputs and two outputs. I have wired the 1-4 pickup coil as one input, and the 2-3 coil as the other. The outputs are the same, output 1 is 1-4, and 2 is 2-3.
My "twin trigger" setup is supposed to work with 4 cylinder 4 stroke wasted spark ignitions, but I do not have something set up correctly.
Thanks for any advice, education, or info.
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