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post #1 of 16 (permalink) Old 03-13-2012, 09:25 PM Thread Starter
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Can someone help with an explanation

So I have a question about spark on a sled, any sled. If i have a twin cylinder and 1 coil and 2 wires coming from that coil, do both wires fire at the same time even though the pistons are at different positions in the cylinders? In a car you have a rotor or something else that fires each cylinder at different times depending on where that piston is at in the rotation of the crank, but it almost seems like on my sled 03 polaris edge, with 1 coil, how would it fire in the right spot when both pistons are in different spots in the rotation. What about triples, does the spark fire in all 3 cylinders at the same time, and if not how does it send a signal to each cylinder individually, I am just confused, can someone please enlighten me on how it works. I hope this all makes sense. Any help is greatly appreciated.
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post #2 of 16 (permalink) Old 03-13-2012, 09:28 PM
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yes they fire at the same time. the position of the piston decides whether it fires or exhaust
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post #3 of 16 (permalink) Old 03-13-2012, 09:52 PM
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It's called wasted spark ignition. Like ken said it fires on compresion and exhust strokes. Almost all your cars and trucks and small engines use that technology now. It's simple with less maintenance.

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post #4 of 16 (permalink) Old 03-13-2012, 10:01 PM Thread Starter
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So on a triple are there 2 cylinders that are on the exhaust stroke when the 1 cylinder fires right?
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post #5 of 16 (permalink) Old 03-14-2012, 01:10 AM
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I beileve its split into 1/3 rds of a rotation but yep. Wasted spark on the exaust stroke. Hmmmm I got 2 tripples and I have never paid attention to what cyclinder is going up or down at which time. Maybe some could chime in to either prove or disprove me here. Either that or next week ill go check out my sleds just so I know. But I don't think 1 would be going up while 2 would be going down. That would cause a big imbalance in torque.

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03 yamaha venture - hers
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post #6 of 16 (permalink) Old 03-14-2012, 01:24 AM
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For a "lost spark ignition system", a twin, both plugs fire twice per revolution. One is lost or wasted. The spark that ignites the fuel does it at the same timing that a distributor would; somewhat just before top dead center. On a triple, there are three sparks per revolution per plug, two are lost. Depending on the orientation of the crank, one of 'em is bound to find some fuel to burn somewhere

In systems like that, there's no firing order; any plug can be fired at the correct timing by any wire. Made me feel pretty silly when I spent all that time labeling which plug wires went to which cylinder on my 650 when I got it!

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post #7 of 16 (permalink) Old 03-14-2012, 01:45 AM
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Lol yep a friend of mine has an xlt and He was wondering why #1 and #2 were crossed. Told if its running don't worry about it lol. Along this line of thinking didn't the 95 or 96 storms come with 3 triggers to fire the coils seperatly? Or maybe an aftermarket thing? Wondering about some upgrades to my 94

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03 yamaha venture - hers
82 panther - my collector
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post #8 of 16 (permalink) Old 03-14-2012, 08:56 AM
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Not sure, but it would be easy to test. Swap the plug wires, if it goes from running to not running, it must have different triggers. Mark 'em first

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post #9 of 16 (permalink) Old 03-14-2012, 02:15 PM Thread Starter
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So the reason I ask is because my brother in law has a yamaha mtn max 700 triple but he's only firing on 2 cylinders, there is only 2 sparks and the 3rd one isnt there, spark, spark, nothing, spark, spark nothing, he asked my opinion and I told him to check flywheel to make sure he has the 3 pickups on the outside if it. What else would cause you to lose 1 spark in the revolution of the crank?
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post #10 of 16 (permalink) Old 03-14-2012, 03:19 PM
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Bad plug, bad end cap.




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post #11 of 16 (permalink) Old 03-14-2012, 04:03 PM Thread Starter
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That what I thought too, but even changing plug wires didnt help, checked other wires and they are all missing the 3rd spark.
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post #12 of 16 (permalink) Old 03-15-2012, 02:02 AM
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I would post this on the yamaha side to see if someone else has had the same issue. Otherwise I would varify ur missing the 3rd spark alltogether or if u have a bad cylinder with marking the clutch and using a timming light to test if u have 3 spots it hits on or only 2 or if it misses randomly. May give u a clue as to where to look before replacing any spendy parts

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post #13 of 16 (permalink) Old 03-15-2012, 06:22 PM
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Check the trigger sensors next. One might be bad.




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post #14 of 16 (permalink) Old 03-16-2012, 06:36 PM Thread Starter
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What is a trigger sensor?
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post #15 of 16 (permalink) Old 03-17-2012, 12:27 PM
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Look down on the recoil/mag housing, there should be a sensor that reads the magnet trigger on the outside of the flywheel. This is what tells the CDI when to fire the plugs.
If one of the little magnets is missing, it will not fire at that point.




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post #16 of 16 (permalink) Old 10-07-2019, 01:31 PM
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I have a similar problem, maybe someone here can help me, i have a 98 RMK 600 liquid twin. I have spark in both plugs, but when i pull the sled over its only firing on the mag cylinder side, other cylinder is cold and exhaust only comes out the one pipe. Both cylinders were wet with gas so i dont know why it was not sparking in the one cylinder. My spark looked a little weak, maybe its not getting 2 sparks in per rotation? There is a piece of wiring that comes from my cdi box and plugs into my wiring harness that has been a little melted and needs to be redone, but im not sure how this would effect just one cylinder because i still have spark in both plugs. Please enlighten me if you know anything of what im talking about. Thank you everyone. I'll post some pictures of my beauty when shes running on both cylinders, and soundin mean.
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