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Just a thought without looking at it but could be loose wires involved with the coil. Bad coil wire.[burnt or worn on inside] Can you see spark jumping from pug wire. If so try tape on wire, and if that helps ,replace wire ,and coil if inseparable. Also check wiring coming from magneto, points or cdi . Electrics are the mechanics worst problem to solve.
Silly questions! Is this a kick or button start? Is there a security 'Dead' switch fitted to the ATV that you have left on? Have you changed the actual spark plug? Is the Battery fully charged? Turn all the other features off that you can on the ATV before you start it. This stops any other drains on the voltage at starting.
The 3000 mule I have worked on has a coil, wire which screws into the coil and spark plug boot.
Do you have power and ground connection at coil.
You said you replaced coil did the wire and spark plug boot get replaced also.
If there is any question about the connection between the coil, wire and boot you might try removing the coil, wire and boot from back cylinder and placing on front. Swap them and see if you loose spark on rear plug after swapping.
Just a thought.
Solid state ignition has a capacitor that must charge and when the right time comes a SCR will dump the charge into the coil to make a spark. There is a minimum voltage that is required to trigger the SCR and at low RPMs that normally is close to being not enough. Most likely you will need to change out that CDI ignition or check the coil in the magneto, it may need to be adjusted closer to the flywheel.
guessing you changed the spark plug? .. you can fry the coil from heat...I used to wrap coils in rags when I tested them on a coil tester to try to make them break down from the heat quicker. It worked too.
If there is no spark and you replaced the coil next step replace the spark plug dont assume its okay replace it!! next step is to get the CDI Box checked. Probably need to replaced that first.
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