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KLR250 Trouble

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Hey guys, my KLR 250 struggles to rev in nuetral past 6000 rpms and wont go any faster than 45 mph. Once I hit 4th gear, (its a six speed) I hit 5000 rpms at 45 mph, and it wont climb any higher. Its also has really sluggish acceleration and throttle responce. Only has 1700 miles. Sat for a while, but rode it last year while it was gutless like this. Never had issues with starting and idling. Just has no hustle for a 250. Ive cleaned the carb which seems to help some, but then if it sits, it goes back to being gutless and tired. It doesnt smoke. Could this be Valves or Jetting? Im stumped at this point.

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If the gas is untreated for ethanol and sits more than three weeks, it goes bad

My bike is ridden on the weekends and doesnt sit for more than a week, and the 91 octane contains no ethanol

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