ordered sparks full system for my 450r as well as je 14:1 piston from sparks. has any one had this setup and know what main jet/pilot to use? also what octane to use with 14:1 piston? 12.5:1 needs 108 so probably upwards of 119 like from the honda barn? also has any one tried the 500 stroker kit from atvparts.biz ??