Service Manual

8-4
Table of Contents
Twin Cylinder Engine Service Manual
February 2017 - Digital Edition
ENGINE INSPECTION AND RECONDITIONING
Upper End Inspection and Reconditioning (Cont.)
Cylinder Head Valve Seat Inspection
Throughly clean the cylinder head to remove carbon deposits.
1. Inspect valve seats (Figure 2):
-Loose Seat
-Proper valve face contact (see steps below)
-Proper seat width, standard 0.028-0.030 in., service limit 0.040 in.
2. Repeat inspection for all valves and seats.
CONTACT TOO LOW
CONTACT TOO HIGH
Figure 2
Contact too high
Contact too low