Noral speed range?

I think you have your gearing reversed in your mind- if you're after more speed- you need larger gears on the front motor end and smaller sprockets on the back. 36 teeth rear sprocks are quite popular- at your low weight you might get away with 32 if you aren't riding a lot of long hills. The smaller rear sprock also gives better frame clearance and so you can more likely lose the tensioner and match the chains, which may require half links- the pedal side is easier to vary.

I might use today an aftermarket spring tensioner, but never tried one here yet.

This gives a "longer" gear in inches- higher top speed- less revs-noise and vibrations for the same speed- and that usually is a China Girl motor PLUS- at slightly less low speed torque pulling- you might have to pedal just a bit more to pop the clutch and take off, or bog down on large hills

drive sprocket comes off with the puller in the kit - 2-strokes don't like slow speeds, so I usually slip clutch a bit to get rolling thru a parking lot, pull clutch and coast a bit, then repeat

Maybe you should think about a 50cc China Girl then - they are quieter