Originally Posted by demac
im not really good with measurements but clearly one piston is much smaller i think you may have gotten the wrong piston?
The piston is not smaller in DIA. it just has a shorter dome on top of it, some of the 66cc engines came with a semi flat top piston rather than the higher domed piston, but as far as I know all of the slant head engines use the domed piston.
You are right in that I did get the wrong piston for the slant head, but all I need to do is find the head that is used on the engines with the flat/Slightly domed piston and I will be good to go with it.
Thanks for the input.