2 coils+2 pulsers= simple plug wiring

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Joined: Sun Nov 30, 2014 2:30 am
Location: puyallup,wa.
Motorcycle: 1986 gl1200a aspencade . Honda xl600r, '68 z50, '82z50, '80cx500c, '00 klr250

2 coils+2 pulsers= simple plug wiring

Post by deanbw » Fri Mar 20, 2015 12:40 am

Howdy again all, while on my quest to exhaust every penny I have (already been through the dimes and nickels), I am going through my aspy and "cleaning it up", that idea went out the window long ago.
So while the engine is out and bike is pretty much stripped I decided to clean and check all wire connections. I have the coil set ready to go, as soon as my new plug caps and wires get here I'll get them back together.
While I was working on them I started thinking about the ignition system. With four cylinders, two coils and two pulsers run off the crank that means one thing......wasted spark ignition. it's a very simple system and used on a lot of bikes and small equipment engines.
This of course means that plug 1 and 2 are fired at the same time, now that doesn't mean both are making power, while plug one is firing on compression, number two is on exhaust stroke hence the "wasted spark".
This really doesn't mean much except that there is no need to worry about wiring all that much. Now what I mean by that is the coil on the right has number 1 and 2 plug on it, which wire goes to 1 or 2 doesn't matter because both plugs fire at the same time anyway.
So as long as the wires on the right coil go to 1 and 2 and the left coil goes to 3 and 4, thats all that matters, the coils cant differentiate between their respective wires, they fire both.
I marked my bracket so you can see what I am talking about.
Right coil=1 and 2
Left coil=3 and 4
Thats all that matters. which wire on right coil goes to 1 and 2 doesn't matter, same with left coil for 3 and 4.

This is probably old news to some and my be somewhere in here already, if so sorry to bring it up, but some may not know how wasted spark works so it may be news to them.

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