Originally Posted by saikamaldoss
what is the compression ratio that you have on this bore ? you have a cast piston and if you use 305 on stock head the compression will be 12.8:1 which will be too much and piston will brake. whats the compression on this setup ?
we do not have actuall compresion on the engine yet, we install it straight away what is kawahara give to us. there is extra thick gasket comes with the package which will lower the compression.
our goal here is to check the durability of the bore up kit.
i will give you an update of the compression ratio once we have done with durability check with extra thick gasket.
you are right, 12.8:1 is way to much for casting piston.
i'm sure it will not reach more than 12:1
we have been testing about aweek now with Indonesian temperature is constant around 29-33celcius and humid weather. approximately, we have put more then 500km to the bike and the bike is ok and in normal condition. no need bigger radiator.