Sure is.
My first place I'd look is the powervalve. Pull the pipe and the right hand side cover and ensure the plate is connected properly. Sometimes the weld breaks and the powervalve flaps around under its own accord severely sapping power.
Next stop I'd pull the carb and give it a nice clean and baseline the jetting specs. If you see an N1EF needle start reading and arm yourself to tune the bike.
90hrs isn't a whole lot of work, especially if its a trail ridden 300.
What gearing is it running?
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