Bigger front sprocket or smaller rear sprocket would result in higher speed for the same engine rpm.
Still i insist that
Stock gearing is best. You will find that if you gear it taller, with a bigger front sprocket or smaller rear, it will no longer pull top speed in top gear. You may be able to reach top speed but what's the point, You lose launch capability because your first gear is now too tall. The subjective impression that it is revving too high in top gear is just a bias on your part. Get used to it. The engine is designed for it.
Or upgrade to a better machine.
Rest if you want calculate your best figures go here



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