poor break in procedure, poor piston ring gap or piston-cylinder fit. uneven cylinder stud torque and leaking exhaust. cylinder and piston distortion causing scuffing of parts. lack of adequate lubrication.
poor break in procedure, poor piston ring gap or piston-cylinder fit. uneven cylinder stud torque and leaking exhaust. cylinder and piston distortion causing scuffing of parts. lack of adequate lubrication.
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