Not sure if you'll be able to find a motor sprocket in 18 tooth. 17 is the largest I've seen for the 175. An 18 might start running into some clearance problems.
However they can make you any size rear spocket you want...that way you could adjust your final ratio to what you want while still using a 17 tooth front.
Sounds like you are getting a bike ready for Mosport
JohnnyB
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