Service Manual

8-6
Table of Contents
Twin Cylinder Engine Service Manual
February 2017 - Digital Edition
ENGINE INSPECTION AND RECONDITIONING
Upper End Inspection and Reconditioning (Cont.)
Valve Inspection
1. Clean carbon from the valve (Figure 3).
2. Inspect the valve stem for pitting, wear or if bent. Compare to standard.
Stem Diameter Standard Service Limit
Intake 0.258-0.259 in. 0.255 in.
Exhaust 0.257-0.258 in. 0.255 in.
Replace the valve if the stem outside diameter is smaller than the service limit.
3. Inspect valve face for pitting, wear or corrosion.
4. Replace valve if encounter any of the items above.
5. Repeat inspection for all valves.
Figure 3