4TNC88 4TNC88L-RB Overhaul Rebuild Kit For Yanmar B50 Excavator Engine Parts4TNC88 4TNC88L RB Overhaul Rebuild Kit For Yanmar B50 Excavator Engine Parts Condition: Brand New, Aftermarket Parts Application: Yanmar 4TNC88 Engine Item Includes: 4 PCS Piston 4 PCS Pin 8 PCS Circlip 1 Set Piston Rings ( Fit For One Engine ) 1 Set Full Gasket Kit 1 Set Main Bearing 1 Set Con Rod Bearing 1 Set Thrust Washer 4 PCS Intake Valve 4 PCS Exhaust Valve 8 PCS Valve Guide ( IN & EX ) 8 PCS Valve Seat ( IN & EX )