My mods are...Stock stroke 64.5 bore, head milled .20 drag ported by wildcard. Cases port matched, plus 4 timing, 35mm Pwk CEL needle 58 pilots and 162 mains. No bog on bottom and this thing ran real good. This was new plugs 6th wide open and turned bike off, held clutch open, and throttle wide open. Oh almost forgot Sheares inframe small bore. and Pods for filters