Has it suddenly got worse? Maybe some crap fuel or damage to the exhaust. You don't say what altitude you're riding at, that will have an effect too. What happens if you pull the choke out a bit does it get better? Also check the rubber between the carb and the inlet manifold. If it's cracked there could be air getting in and making it run lean. I'm sorry if you've tried all of these already but I'm thinking aloud. Good luck, nothing worse than a lack of power!
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