Phil,

Down on the right hand side of the engine (as you sit on the bike) towards the front you will find the starter solenoid and a couple of connector blocks, these are notorious for vibrating loose and don't take kindly to being covered in water ... get in amongst them and disconnect, wipe off and reconnect them, this really only applies to the pop on pop off ones as they are usually the culprits, also check the fuses and the battery connections.

Hope that helps.