I have a 1994 polaris trailboss 250 and it seems to stall right out when I ride over puddles can anyone explain why this is happening and maybe if you have any idea of the cost to fix that problem?

 

Usually it's water that can ground out a plug cap,splash under the front panel and ground out a coil or cdi. Just blow out the plug and cap area,all connectors with an air gun or just let every thing dry out. Then use electrical grease at all electrical connectors,inside and out side the plug cap a little and this should help. Make sure no water is getting into the air box also.