For more overall power you would need a bore and/or a stroke kit, if there is one available. A exhaust and a air filter along with a rejetting would give you a little boost.
Cheapest and easiest would be new sprocket sizes. A smaller rear sprocket will give you more top end speed, but you will lose alot of your acceleration. A larger rear sprocket will give you quicker acceleration, but lower top end speed. If you go this route you will need a new chain
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