Originally Posted by 650XDriver
Check your charging circuit. Once you start the bike it will run without the battery installed as it is charged independently of the power circuit supplying the bike. Sounds like you could either a bad stator or a bad rectifier. In either case, parts are easy to get but will be pricy. Hope this helps.
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The bike does not run without a battery. No Sir.
OP sounds like the only thing that changed since you finished your service was your battery going dead. Maybe you should also check the usual problem when installing crash bars and nicking some cables down there. Maybe check in the HOW for testing your charging circuit.