No Spark

[craig collins]

Hello, I recently purchased a used polaris. It was running great and it backfired while i was riding, went dead and hasn't had spark to the plug since. Checked the wiring over and it seems fine. hope someone has some ideas

[rpyfz450]

The fortunate thing about your ignition problem is that it's consistent. This makes troubleshooting very easy.

Have you checked whether power is being delivered to the ignition coil via it's primary wires?

Have you checked the battery leads to ensure they didn't come loose?

One thing it could be is the crankshaft sensor. I'm not particularly familiar with troubleshooting Polaris products, but all modern ATV engines have a trigger coil that could stop working. This component is usually easy to get to and doesn't cost much. You'll find a resistence (ohms) test in your service manual, but I also recommend visually inspecting the sensor behind the flywheel cover because it may have come loose or has physically broken off (and still can pass the electrical test).

[craig collins]

<div class='quotetop'>QUOTE (rpyfz450 @ Dec 7 2006, 09:03 AM) <{POST_SNAPBACK}></div>

The fortunate thing about your ignition problem is that it's consistent. This makes troubleshooting very easy.

Have you checked whether power is being delivered to the ignition coil via it's primary wires?

Have you checked the battery leads to ensure they didn't come loose?

One thing it could be is the crankshaft sensor. I'm not particularly familiar with troubleshooting Polaris products, but all modern ATV engines have a trigger coil that could stop working. This component is usually easy to get to and doesn't cost much. You'll find a resistence (ohms) test in your service manual, but I also recommend visually inspecting the sensor behind the flywheel cover because it may have come loose or has physically broken off (and still can pass the electrical test).[/b]

<div class='quotetop'>QUOTE (craig collins @ Dec 8 2006, 01:49 AM) <{POST_SNAPBACK}></div>

<div class='quotetop'>QUOTE (rpyfz450 @ Dec 7 2006, 09:03 AM) <{POST_SNAPBACK}>

The fortunate thing about your ignition problem is that it's consistent. This makes troubleshooting very easy.

Have you checked whether power is being delivered to the ignition coil via it's primary wires?

Have you checked the battery leads to ensure they didn't come loose?

One thing it could be is the crankshaft sensor. I'm not particularly familiar with troubleshooting Polaris products, but all modern ATV engines have a trigger coil that could stop working. This component is usually easy to get to and doesn't cost much. You'll find a resistence (ohms) test in your service manual, but I also recommend visually inspecting the sensor behind the flywheel cover because it may have come loose or has physically broken off (and still can pass the electrical test).[/b]

[/b][/quote]


<div class='quotetop'>QUOTE (rpyfz450 @ Dec 7 2006, 09:03 AM) <{POST_SNAPBACK}></div>

The fortunate thing about your ignition problem is that it's consistent. This makes troubleshooting very easy.

Have you checked whether power is being delivered to the ignition coil via it's primary wires?

Have you checked the battery leads to ensure they didn't come loose?

One thing it could be is the crankshaft sensor. I'm not particularly familiar with troubleshooting Polaris products, but all modern ATV engines have a trigger coil that could stop working. This component is usually easy to get to and doesn't cost much. You'll find a resistence (ohms) test in your service manual, but I also recommend visually inspecting the sensor behind the flywheel cover because it may have come loose or has physically broken off (and still can pass the electrical test).[/b]

battery connections are good. Just put new one in. I will check the coil and crank sensor. Thanks for the info!

[CycleProRacing]

<div class='quotetop'>QUOTE (craig collins @ Dec 8 2006, 02:00 AM) <{POST_SNAPBACK}></div>

<div class='quotetop'>QUOTE (rpyfz450 @ Dec 7 2006, 09:03 AM) <{POST_SNAPBACK}>

The fortunate thing about your ignition problem is that it's consistent. This makes troubleshooting very easy.

Have you checked whether power is being delivered to the ignition coil via it's primary wires?

Have you checked the battery leads to ensure they didn't come loose?

One thing it could be is the crankshaft sensor. I'm not particularly familiar with troubleshooting Polaris products, but all modern ATV engines have a trigger coil that could stop working. This component is usually easy to get to and doesn't cost much. You'll find a resistence (ohms) test in your service manual, but I also recommend visually inspecting the sensor behind the flywheel cover because it may have come loose or has physically broken off (and still can pass the electrical test).[/b]

<div class='quotetop'>QUOTE (craig collins @ Dec 8 2006, 01:49 AM) <{POST_SNAPBACK}></div>

<div class='quotetop'>QUOTE (rpyfz450 @ Dec 7 2006, 09:03 AM) <{POST_SNAPBACK}>

The fortunate thing about your ignition problem is that it's consistent. This makes troubleshooting very easy.

Have you checked whether power is being delivered to the ignition coil via it's primary wires?

Have you checked the battery leads to ensure they didn't come loose?

One thing it could be is the crankshaft sensor. I'm not particularly familiar with troubleshooting Polaris products, but all modern ATV engines have a trigger coil that could stop working. This component is usually easy to get to and doesn't cost much. You'll find a resistence (ohms) test in your service manual, but I also recommend visually inspecting the sensor behind the flywheel cover because it may have come loose or has physically broken off (and still can pass the electrical test).[/b]

[/b][/quote]


<div class='quotetop'>QUOTE (rpyfz450 @ Dec 7 2006, 09:03 AM) <{POST_SNAPBACK}></div>

The fortunate thing about your ignition problem is that it's consistent. This makes troubleshooting very easy.

Have you checked whether power is being delivered to the ignition coil via it's primary wires?

Have you checked the battery leads to ensure they didn't come loose?

One thing it could be is the crankshaft sensor. I'm not particularly familiar with troubleshooting Polaris products, but all modern ATV engines have a trigger coil that could stop working. This component is usually easy to get to and doesn't cost much. You'll find a resistence (ohms) test in your service manual, but I also recommend visually inspecting the sensor behind the flywheel cover because it may have come loose or has physically broken off (and still can pass the electrical test).[/b]

battery connections are good. Just put new one in. I will check the coil and crank sensor. Thanks for the info!
[/b][/quote]


Check your flywheel too, sometimes when an engine backfires it will momentarily spin the engine rotation backwards causing the keyway to shear in half.