My experience with the same sprocket ratio left me with the desire to change sprockets. But after installing the A12 cam I noticed a very nice improvement in low to mid rmp performance. I will soon be getting a port and polish done on the head. Everyone says there is no greater performance gain than a good port and polish. I will post results in a few weeks after I get it done. If you change the sprocket you WILL lose top speed, but if you keep the gearing the same and build the engine for more power you will gain the bottom end pull that you want and gain acceleration and maybe even a bit more top end.
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MXR TrailBender 160R
SYC Perf head P&P,Matched intake and exhaust, A12 cam, Orange CDI & coil, Motorio pulley, 115mm Variator and lightweight drive face,11gm Sliders, UNI, modded muffler + 200 horsepower 
http://www.youtube.com/watch?v=3hx-hEWl10c
I'll take your insults as compliments and blame it on your lack of intelligence.
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