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/
Porting / Custom exhaust for Honda Express
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Porting / Custom exhaust for Honda Express
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Buy air filters and gaskets here (Ebay): http://stores.ebay.com/noiseguysstore
Buy air filters and gaskets here (Amazon): www.amazon.com/shops/spreepower
Buy a t-shirt here: https://teespring.com/stores/spree-powersport-products