My Yamaha TZR50 will not start after a spell of rain. It will run for a while but when i put it in gear and start to ride it will soon lose all power and just stop me on the side of the road, then she will start again but the same thing happens over and over again. However now the bike struggles to start at all because of constant rain shower recently. This only happens in the wet. On a dry day when the bike is dry she is lovely. Please help.