It's not a pe piston it's a maico 490 piston my crank isn't standard and has a different rod in it and you can probably make out the barrel spacer in the pics so it's a pe 400 cylinder yes but the rest is all different.
I will order another one you live and learn with these type of things it didn't really even upset me I was only spewing I didn't catch up to ride with my mates in front of me and I could see how it could cause some havoc being so wet bikes under a lot of load and I got a bit carried away trying to see what it could do and it was flying when it seized.
May not have ran to well for me but it handled and looked good at least.
I will probably run mineral oil from now on and I am going to start at 20:1 the oil I was using I noticed it wasn't making much blue smoke but I just put it down to being a fresh engine.