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Originally Posted by Water Warrior
Didn't quite understand the bore out statement. Are you saying you bored out the cylinder ?? How much did you go ? Did you need a new piston ? Any other changes to the engine ? And last but not least..........did you get a good return of power for your efforts ?
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yes i bore up the cylinder to OS200 or put in a 74mm piston. but i didnt just go with the OEM cylinder, i replace it with cylinder from diesel engine. why i choose diesel instead of bore from current OEM cylinder? because diesel cylinder is much tolerant to extreme heat and it is more thicker so i can bore it again up to OS400 while if i use OEM standard, the cylinder will very thinner and can crack the engine.
for piston, i use from gasoline engine with the diameter i want with the same pin diameter (18mm). since here we dont have privileged for large diameter motorcycle piston, we use piston from car like camry, mercedes benz, daihatsu zebra. sure with some adjustment. and that's about it, no more changes. up till now, i've used the bore up engine for about a year and truly no problem at all.
the effect on my bike? yes it accelerate much faster, more power torque, but of course the top speed still the same with standard. if i want to exceed it, i have to change the stroke, but i will not do that as there will be lots adjustment and can shorten engine life.