I was inspecting my old piston head a little closer, and it says CS90 on its side. And, when I was measuring the bore of the cylinder (before looking for another piston) to make sure I didn't have an over-sized one, no matter how hard I tried, I could not get the bore diameter to be 50 mm. I kept getting 49.7 mm as a measurement. So now I'm wondering: do I really have CS90 stuff on my CT90? Can I fit a CT90 standard diameter piston inside this seemingly smaller bore? What do you guys think is going on here?
Calvin
--Edit--
I guess I should have done a tad more research before posting my question. It seems that the CS90 is the same as the S90, which is covered in the Honda shop manual. Consulting it, I found that it had a bore size of 50 mm also, so it seems to me that the piston is interchangeable, if not the same.
