2004 Skidoo ZX Series Service Manual, Page 272Get this manual
Section 05 ENGINES (4-TEC) Subsection 06 (CYLINDER AND CYLINDER HEAD)
Valve Face and Seat
V01C1HA
R1004motr103A
AValve face contact width BValve seat contact width
1Valve seat 2Exhaust valve contaminated area 3Valve face (contact surface to valve seat)