I have a Polaris Magnum 425 4x4 and it will not stay running or start for that matter. Any help would be greatly appreciated.

New parts
-Fuel Pump and lines
-Carb
-Stator
-Fuse/Terminal board
-Spark plug and coil
-CDI Box
-Fuel Filter
-Key and ignition

Checked so far
-Good spark
-Good fuel flow
-Cleaned all grounds and wires
-Cam is in good shape

The only thing I can think is that it won’t run because it doesn’t have a air box on it currently. I’m not well versed in 4 stroked and this is my first Magnum. It runs for about 5 seconds and then dies right out like you shut the key off. It will backfire when it dies out too.

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