engine wierdness...

[bogieboy]

so i was working on my engine tonight out of the shineray, everything i see says it has the 163 fml engine in it, so i ordered all parts for a 163...as i am draining the oil to check the clutch, i notice my case says 169 fml, not 163....so no i freak thinking that the piston and stuff i have coming wont fit, since everything i have seen says that the 169 had a 69mm bore, and the 163 has a 63mm bore... BUT....i whip out my calipers and find that my 169 engine has a 63mm bore....WHAT GIVES???LOL as soon as i get the new piston in i will be measuring the stroke as the 169 supposedly has a shorter stroke...