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the 2014 rules are on the web site but give hooton a ring as I think there are more rules than printed as the idea is that all box karts have about the same lap times so there should be things you can do to the engine like rejet the carb or have a none std exhaust but it depends on your weight,, you have to make a min of 165kgs and the upper weight is 195 kgs ( if over that like me hard luck ) the top weight can have a none std air box and a rvl type exhaust but it has to be silenced,,,the lowest weight the engine has to be std as out of the box ( valve springs can be changed on all engines ),, weights 165kgs to 175kgs,, 175kgs to 185kgs and 185kgs to 195kgs and over 195kgs but as I say give bob a ring
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