been using aftermarket bigbore 60.0mm for about 1 year (n never rebore-ed yet)
acceleration much2 improved, but the top speed IMHO almost the same if using standard CDi (cut-off at 9k+- rpm), need to play around with sprocket ratio (depends on your daily usage or preference)
probs during long distance? i have tested FULL THROTTLE bangi-penang-bangi and bangi-JB-bangi, maintained at least 150-175kmh (on LC speedo - the reading quite 'menipu' rite?), still no pblm so far
about the maintenance, i think u need to be extra careful of EO level inside ur engine. always check them (more frequent, better) esp for those who always ride it like crazy (or wateva it means) when changing the EO during regular maintenace, just pour it all 1L and standby another 1 for topup (in case if the level of EO reduced). mineral-based EO also can do the job, but need to be changed more frequent. like mine, using red bottle castrol n change it every 2 weeks, pusing2 area s.alam n sometimes to bangi/hulu langat
another one is during the installation, make sure they tighten the 4 bolts (yg ikat head ngan blok ke crankcase) evenly using tighten-torque. else, u'll be end up probs like gasket koyak, leakage in cooling system (coolant mixed up with EO)
when installing bigbore, i recommend to change the standard exhaust manifold to a bigger one (26mm inner diameter shud be ok - if want to maintaned the standard-looked exhaust) coz the std one is too small for exhaust gas to flow out (even for the standard 54.0mm block)
forget to mention.'m just use the bigbore with std carb. no change in MJ/PJ (105/20), just the air/fuel mixture and a bit on tappet (forgot oledi the gap/clearance)
just my 2 cents
This post has been edited by falkenst115: Oct 19 2009, 12:48 PM