99 XR400 415 kit, Mikuni carb, electric start CA Inland Coastal Mountains. Have ridden this bike here before and it ran well, so elevation issues should not be causing this. It was running fairly well, started to sputter while climbing a very steep, rocky trail. Then no power and a fall. Broke the starter switch. Electric starter does not turn over when shorting hot wire to ground. Bump started and the bike will not rev out, sputter. A fellow rider tells me that the tail light is flickering. Sounds to me like an electrical issue? Maybe wiring to CDI. A ride is scheduled tomorrow with 2 brothers and a nephew from out of state and I need this bike running! Too late for most of you to assist tonight. Any one have an idea as to where to start? FURTHER A few weeks ago this motorcycle died at the end of a river fording. Started up and ran well after that.