I have a dual sported 2003 WR450 i bought as a basketcase. I had help with a replacing a few gears, freshened up jug, rings etc... all new parts done by a very experienced Yamaha buddy. It starts and runs perfectly till the battery runs down then pops, and eventually stalls. Starter button clicks but no go. SOMETIMES it will start by kicking. A new battery made it last longer but still had the same result.
So I test the terminals at the battery and it is not charging. It goes from 13.4 off the trickle charger to 12.4-ish. Only tested at idle and these #s are approx as it was last week when I last had time to check it out.
It has a Baja Designs Kit for switches etc. so I assume the stator is "floated" which I learned from searching here. I have the Yami manual but am unsure what to test next or what #s to look for with BD up in the mix.
Edited by guru, October 03, 2013 - 05:08 PM.