I have a 1999 bayou 300 4x4 that backfires through the carburetor. It only starts doing so after warming up for about a minute...till then you can rev the motor with no problem but after it warms up a little it will not rev and bogs down and backfires through the carburetor and exhaust. It has a new stator, pick up coil and carburetor has been rebuilt. Any help would be appreciated.