2005 wr450 yamaha

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2005 wr450 yamaha

Help needed.
Calling all yamaha wr450 owners

Just purchased a 2005 wr450 which was fine for the first few days. But all of a sudden developed a bogging at Arround 4k 5k and would randomly cut out with no electrics so have to bump start.its asif electrics would trip but if disconnected the battery and re connected it the power would come back but now it won't even do that there's now electrical power it won't kick and won't even bump start. Can anyone please help.

Thank in advance.