1.crank case vent mod- remove the factory hose from the lower air box to crank case, replace with around 5 foot of 1/2 inch hose wraped in loops simular to a ptrap on a sink. what this does is stops the water in the loops from entering your engine if you should happen to get water inside your air box.
2.carberuator vent hose- at the back of the carb theirs a vent line that drains the fuel bowel when its overflowed with fuel. simply install a 1/8 inch one way check valve. what this does is allows the carb to drain but also keeps water or mud from entering the carb.