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About freddos

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    TT Newbie
  1. Hi guys i got a 250 exc 4 stroke 2004 and I put a crankshaft,piston, cylinder and head including valve of a 400 exc in my 250 base. The bike is running fine until i open full throtle i'm missing power. So my question is do i need to replace the electronic box, also the cam i still got the 250 one and about carburation do i need to swap for a 39 mm i got a 37 mm . Thank's