Piston
･ Lightweight piston made of high-strength aluminum alloy 2618A.
･ Standard series comes with chromoly piston pins. (Parts No.42551)
･ Extreme Duty series comes with 9310 alloy piston pins (Parts No.42551)
･ Pressure balance groove structure.
･ Valve recess compatible with 1mm over-size big valves.
･ Recommended piston clearance: Standard specification 0.076mm
: High boost specification 0.088mm