Scrambler 400 problems?

[nickmon3]

Hey I have a 2000 scrambler 400. It idles and runs fine, but when i let off the gas it sometimes begins to backfire or it kills the enigne. Any tips? Also how do i know if the oil injection is working?

[uncertifiedmechanic]

You might want to look into the stator and see if the marks are lined up, timing could be advanced and or retarded.
Using oil? pump is working then

[nickmon3]

Ok well i moved the clip in the carb up a notch and that seemed to help. But now I have another problem. I had a dead battery and never got around to replacing it. So today I hooked up another old battery I had to see if it would hold a charge, but now when I start it up none of my lights work. Any tips?