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step1: first measure the size of the cylinder head (please see the cylinder head in the video)
Step 2: Measure the diameter of the mounting hole
Step 3: Measure the distance between the two mounting holes
Step 4: Measure the distance from the piston to the mounting end surface
Step 5: Measure the length of the piston
Loading size = distance from the piston to the mounting end surface-the length of the piston
Please watch the following video content for specific steps