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#2
Loading up from too much fuel in most cases until you have enough rpm and speed to accept the fuel. This usually is from a worn needle and seat or float level off or both.Plus too large of a main jet can do this also,but if stock I'd suspect the carb. If you have to remove a carb install a new carb kit. The kit costs less than an oem needle and seat.Along with the carb don't over look simple things like a dirty air filter. Can do the same thing.Plus here's the fuel section from the manual that can help you along with checking the float arm level. https://www.google.com/url?sa=t&rct=...,d.aWw&cad=rja http://www.ebay.com/itm/CARB-REBUILD-REPAIR-KIT-POLARIS-1998-1999-SPORT-400-2WD-2X4-98-99-/370626988836?hash=item564b170b24&vxp=mtr