It is possible that the 16 tooth sprocket was too big of an increase. You may now be lugging the engine, or over working it. Go back to the original 13t sprocket and see how it performs. If it is slower than it was originally, then something may be wrong. If it is as fast as it was before, then all is well. If it picked up any speed, all the better.
But the simple addition of CF reeds, will seldom make enough of a difference to been seen on a speedometer. For a 5 MPH increase on a 90cc buggy, you will probably need about a 30-40% increase in HP, to carry a larger sprocket, for that amount of speed.
An engine transplant, might be more cost efficient. Otherwise, I'd start looking for a bigger carb, ported cylinder, forged piston, expansion chamber, higher compression, better ignition unit....yadayadayada... speed costs.
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kliff
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