hi folks,
im currently going over the top end on my 09 ec250r. my plan is to eventually get the head machined to an appropriate squish.
but before i do that, i want to set up the cylinder height/base gasket stack.
upon searching, i found that a lot of people with 300's set the top of the piston at BDC to be level with the bottom edge of the exhaust port, should the 250's be set up the same?
the set up in bike currently, from factory is:
base gasket stack of 1.3mm
piston is 0.63mm above the exhaust post at BDC.
squish is a hugh 2.75mm.
im thinking of:
base gasket stack of 1.5mm
piston @ 0.43mm above exhaust (???? or should this be less/more???)
then machine squish to about 1.6mm
i realise this may not be quite the correct way to go about all this and i should be mesuring post durations and stuff, but all that is a little technical for me.
does this sound right? does anyone have "better" numbers i should be aiming for?
bike runs great, hoping to just get a little more all over and maybe a fraction more bottom end...
thanks.
im currently going over the top end on my 09 ec250r. my plan is to eventually get the head machined to an appropriate squish.
but before i do that, i want to set up the cylinder height/base gasket stack.
upon searching, i found that a lot of people with 300's set the top of the piston at BDC to be level with the bottom edge of the exhaust port, should the 250's be set up the same?
the set up in bike currently, from factory is:
base gasket stack of 1.3mm
piston is 0.63mm above the exhaust post at BDC.
squish is a hugh 2.75mm.
im thinking of:
base gasket stack of 1.5mm
piston @ 0.43mm above exhaust (???? or should this be less/more???)
then machine squish to about 1.6mm
i realise this may not be quite the correct way to go about all this and i should be mesuring post durations and stuff, but all that is a little technical for me.
does this sound right? does anyone have "better" numbers i should be aiming for?
bike runs great, hoping to just get a little more all over and maybe a fraction more bottom end...
thanks.
