I have a reoccurring problem with ATV when it’s damp it won’t start and back firing through exhaust:
When there is no dampness it starts and runs fine.
i have taken it in to Polaris dealer, Told me my problem was new battery, which they installed, ran fine for about a month.
I have to keep the battery on battery tender to have enough charge to turn it over. ATV only has 625 miles, I have had since new,
This has been a problem for years.
Can you help me.

 

Check output with engine running, should be 13 v or more. Then check for a draw on the battery when machine is shut off. Parasitic draws can kill a new battery, Worse case scenerio is put a battery disconnect within easy reach to disconnect battery when not in use. Gotta be something robbing the battery when shut down!