Hi Guys ,
I am fairly new to the forum and apologise for coming straight in with a cry for help, I have a DT200 and live in Cyprus so rely on outside advice and you seem to have more professional bikers used to DT/blaster motors than anywhere.
I have cleaned the barrel & head ready for a rebore next week,I would like to pep the bottom end performance up a bit
After reading tons of info here and elsewhere I have done a squish measurement at the edge of the piston with solder .It is 2mm , that is with the old gaskets (top 1mm and bottom .5mm) and using the old piston , I will check the new piston height is the same or adjust accordingly .
I have seen squish measurements recommended from .9mm to 1.4mm . The engine is standard but will be bored to 66.80mm . I thought .5mm off the head would be a safe option. I will then presumably have to increase the volume of the head to keep the compression ratio within sensible limits. At present it is 20cc. Mathematical help to work out the increase needed in the head volume is much appreciated , I reckon I could maybe work it out but I'd like to be sure ..
Thanks in advance
BobC
I am fairly new to the forum and apologise for coming straight in with a cry for help, I have a DT200 and live in Cyprus so rely on outside advice and you seem to have more professional bikers used to DT/blaster motors than anywhere.
I have cleaned the barrel & head ready for a rebore next week,I would like to pep the bottom end performance up a bit
After reading tons of info here and elsewhere I have done a squish measurement at the edge of the piston with solder .It is 2mm , that is with the old gaskets (top 1mm and bottom .5mm) and using the old piston , I will check the new piston height is the same or adjust accordingly .
I have seen squish measurements recommended from .9mm to 1.4mm . The engine is standard but will be bored to 66.80mm . I thought .5mm off the head would be a safe option. I will then presumably have to increase the volume of the head to keep the compression ratio within sensible limits. At present it is 20cc. Mathematical help to work out the increase needed in the head volume is much appreciated , I reckon I could maybe work it out but I'd like to be sure ..
Thanks in advance
BobC