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Table of Contents
Inspection
Twin Cylinder Engine Service Manual
February 2017 - Digital Edition
ENGINE INSPECTION AND RECONDITIONING
Upper End Inspection and Reconditioning (Cont.)
Valve Seat Reconditioning
1. Using a 45-46° cutter, remove enough material to produce a smooth, concentric seat. Follow the valve seat
cutter manufacturer’s instructions (Figure 4).
NOTE: Turn the cutter clockwise, never counterclockwise, continue to turn the cutter while lifting from the
valve seat.
2. Using the 30-32° and 60° cutter to narrow and adjust the valve seat, the valve should contact the middle of the
valve face. Be sure that the width of the finished valve seat is with specification.
Valve Seat
Standard 0.0275-0.0315 in.
Service Limit 0.050 in.
NOTE: The 30-32° cutter removes material from the top edge. The 60° cutter removes material from the
bottom edge of the valve seat.
Figure 4