Want to beat 450 f bikes thinking of getting Eric Gorr to build my engine up to a 296cc race engine with awesome porting n polishing bored out to 296cc Also would like to know if anyone has had this done and how good it is plus flywheel weights are they good n what size would be best , I´m aggressive rider love Fmx MX DT n supermotard racing , got a bigger 270mm front disc to put on with brembo sintered race pads to help stop better , would like to try the pro circuit linkage arm / dog legs ? And help me with the best suspension set ups jetting and is it worth getting the vortex ignition system , I´m open to give everything a go to get better n make a winning kx300 Eric Gorr 450 four stroke killer , at moment as a 250 engine I can still get 3rd into corner 2 on Starts and consistency get top 5 placing racing against a full grid of 450f´s I just want a few more wins I´m 46yrs n love 2 strokes n hate 4strokes , I´ve rode 450´s and I don´t get a thrill out of them like on my 2stroke . Cheers Peto121