Scooterotica

I've just brought a T5 engine that has got a Malossi barrel and head but no piston. I've just had a look on line to buy a piston but there are different sizes. A & B.

How do I know which piston will fit. Will anyone fit?

The barrel should be stamped A to D on the spigot end ,the inside face. You then obviously buy the matching piston. Think standard 125 T5's were like this too iirc.

Brilliant. cheers mate.