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Because the battery seems to be drained after riding, and it should be charged, you ought to rule out the alternator as a problem. Start the engine, place a good multimeter on the battery terminals, and when you rev the engine above 3K you should see between 13.5 and 15 volts on the multimeter. This means your alternator is trying to charge the battery. If you see more than 15 it may be your voltage regulator, if you see less than 13.5 it may be your altenator. Another piece to check is that your ground is clean and tight. Its on the cross bar under your set behind the battery.
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