Guys: Found this on porting / tuning a Honda Express. As I've said before, Express and Spree porting are very similar.
http://www-staff.lboro.ac.uk/~elvpc/bik ... pics/NC50/
This is the repository for hop-ups and mods for Elite and Spree. Look here for information on exhausts, porting, cylinders, intakes, and suspension mods.
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