Service Manual
8-5
Table of Contents
Inspection
Twin Cylinder Engine Service Manual
February 2017 - Digital Edition
ENGINE INSPECTION AND RECONDITIONING
Upper End Inspection and Reconditioning (Cont.)
Valve Face Contact Test
1. Apply a light coat of Prussian Blue or erasable felt-tipped marker ink to the valve face.
2. Insert the valve, lift valve and snap closed against the seat several times.
NOTE: Be sure the valve does not rotate on the seat.
3. Inspect the transferred marking compound for any area of the seat that is not concentric.
4. Replace cylinder head if any of the above items are found out of specication.
Valve Guide Inspection
1. Measure and compare to specifications, inside diameter (intake and exhaust).
Valve Guides (Inside Diameter)
Standard 0.2598-0.2604 in. (6.60-6.615 mm)
Service Limit 0.2624 in. (6.665 mm).
NOTE: Replace cylinder head if any of the above items are found to be out of specication.