Join Date: Aug 2004
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Knowing the RR, my guess is battery. Have you tried to crank it since? If it does turn out to be dead, try charging it and then check that it's getting at least 13.3 V with the bike running. If not, could be a bad stator.
I suggest this first because it's so easy to check, then all the things that Pantablo listed (they are a little more likely, but harder to check), the filter would have to be completely clogged to do what you're experiencing... plugs, coil(s) or power.