Help with pipe design
Moderator: Moderator
it depends on how you opened it up.sometimes if you open the exhaust port wrong you can loose power.the spree engines have low compression so bumping it up will help alot.also open the boost port up.port sideways that way you don't change the port timing.If you change the height of the window your changing the port timing and to many thing come into play to get the performance back.
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Thanks to my sponsors
Nos Energy Drinks,themopedcompany.com,nwautoevents.com,Cycle Gear
90 honda dio sp 72cc
87 elite 50 s with 86cc watercooled mini stroke
87 elite 50 race bike mhr 72cc
91 yamaha tzr 250r
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