Just googled 172mm because you said that's what you saw on the engine. You will need to determine whether you have a hi and low on your shifter or just forward and reverse to determine which you have. However it is possible the starter may be the same. Just google cf-250 starter or cn-250 starter depending on what you have.
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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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