A misfiring engine or loss of spark could simply be a bad spark plug. Replace it quickly and easily with this spark plug you would find at the dealer but not paying the extra cost.  Genuine NGK BR8ES spark plug.  Replaces Polaris part number 3070156. Sold EACH. Fits the following models listed below.

1993        250

1994-95   300

1993        350L

1994-95  400L

1989-92   Big Boss

1997        Big Boss 400L 6×6

1994-97  Sport 400L

1993-96  Sportsman 4×4

1997       Sportsman 400L

REPLACES POLARIS PART NUMBER(S): 3070156