3mm GY6 Cylinder Spacer w/ 54mm Stud Spacings

If you are running a 3.5mm stoker crank shaft you will need to spacer your cylinder so the piston doesn’t travel higher then the cylinder and hit the head. This is the proper spacer you will need for your GY6 A (54mm stud spacing). You will need 2 base gaskets to seal this up rather than 1.