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Message: [QUOTE="Ol'89r, post: 1197151, member: 17212"] As mtk pointed out, you can't accurately measure the difference with a caliper. You have to use an inside micrometer to measure your cylinder and an outside micrometer to measure the piston and determine the clearance. The bigger piston can be used in a worn cylinder to take up the extra clearance but, it has to be measured. You can't guess. For some models you can get aftermarket pistons like Wisco and Pro-X that come in A, B and C sizes. [/QUOTE]