what does case porting do and is it worth doing?

yamaha_snopro

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Joined
Sep 8, 2005
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200
Age
39
Location
Northport, MI
im looking at maybe having some porting done to my 600 twin and i see alot of places that do cylinder porting also do case porting im wondering what it does and if it is worth doing in conjuntion this cylinder porting? :2strokes:
 


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