not much the piston u can gett it from the halfcut.just change the rings,send for machining the block for rebore.iff u have additional funds get a new highcam.it cost roughly around rm2-3k,c the workshop also
---------- Post added at 02:54 PM ---------- Previous post was at 02:53 PM ----------
yup ,get oversize piston and u will get over power
if u r using a standard pipe, change the whole exzos system. dont use 2 big pipe ,the 1,8 inch just right, bigger and u wont have pickup.try using sintectic engine oil.