cdi
i made the change you can swap the cdi,the one for the 650 h1 quad is the same,you will only gain 300 more rpms.i found out the hard way bought one through speedwerx,and its the same one they use on the quad,369 dollars tossed out the window. get a dynatek 8000 rpm advance timing,no reverse limiter.you will blow the motor first.