2003 Johnson ST 6/8 HP 4 Stroke Outboards Service Manual, PN 5005471, Page 147Get this manual

2003 Johnson ST 6/8 HP 4 Stroke Outboards Service Manual, PN 5005471, Page 147

POWERHEAD INSPECTION
6 HP Models
Inspect valve guides for contamination, excessive wear, or damageThoroughly clean all carbon deposits from valve guidesIf guides are replaced, seats must be reground
deposits from seatsValve seats should be concentric to within 0.002 in(0.05 mm)Valve seats

Valve guides

A reputable machine shop is recommended to perform valve seat grindingUse the specifications noted in reference drawings below:

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