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wr400 wr426 wr yz

  1. New Supermoto Riders/Members
    Been creepin the forums for quite sometime... I ride a 2000 yamaha wr400 with a 426 top end. Love this site and love hooliganism ! I have ran into a serious bike dilemma... i put a new top end in my bike and i was wondering what the compression should be? my bike will start by jump starting...