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Steve Stahlschmidt

Polaris 425 Magnum Starting Issues

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Will not start with out a shot of ether then only runs until it's burnt! Replaced fuel pump, carb, fuel filter, fuel shut off, new plug! I'm lost now! Could it have a bad coil? prior to this it would start and run fine!

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If it only runs when you are adding a fuel source, you have a fuel issue. You mentioned a new carb, is it getting fuel? 

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Posted (edited)

Can't be an electrical related issue if it runs on ether. You have narrowed it down to a fuel delivery problem. 

How do you know its getting fuel?

Edited by MarkinAR

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check compression, timing and valve lash- those can contribute to your symptoms.  i agree with@MarkinAR , cant be electric related or it would not fire period.  had you tried cleaning your old carb before you bought a new one?  the choke is another thing id check- if its stuck open, itll flood the motor enough to not run

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Check the plug boot, it has a resistor in it and it can go bad, should read about 5300 ohms. When it starts to get bad, it can deliver a weaker spark which will likely be enough to fire up on ether. The coils rarely go bad, it's usually that plug boot resistor and you can buy it and/or the boot and wire without the coil. The dealer will likely try to sell you the boot/wire/coil assembly.

I just went through this issue, running fine one day, then no start next time.

Ray

Edited by RAYAR

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