Sweet hacker special. Maybe you know what this is truly for?
Here's what we do know. It slides right onto a piston port Derbi and a 44mm piston fits like a glove.
Stud pattern is 46x46mm.
Intake stud holes are 45mm on center.
Exhaust studs are 50mm on center.
From top of cylinder to bottom of the exhaust is ~43.5mm
Cylinder skirt has an outer diameter of 49mm.
This is just a cylinder. No pistons or gaskets etc.
No returns, sorry.