Updated specs are available.
Valve stem diameter (NA6)
This spec doesn't apply to the car you selected.
Not yet checked against the factory manual for your car's year. It's verified in the 1990 Mazda MX-5 Miata Workshop Manual; later manuals may differ.
Diameter IN: 0.2350–0.2356 in (5.970–5.985 mm) EX: 0.2348–0.2354 in (5.965–5.980 mm)Diameter IN: 5.970–5.985 mm (0.2350–0.2356 in) EX: 5.965–5.980 mm (0.2348–0.2354 in)
Factory manualTaken from a Mazda factory workshop manual, with page citation.
Procedure
Measure the valve stems; intake and exhaust ranges differ.
Applies to
- NA 1990–1993 (B6) — Other years inferred from 1990 factory evidence.
- Verified in: 1990 Mazda MX-5 Miata Workshop Manual
Sources (1)
View 1 source citations
Page B–49 (PDF p. 76) · Printed value & notes
Part no. 1193-10-89CPage B–49 (PDF p. 76)Printed: “Diameter IN: 5.970—5.985mm (0.2350—0.2356 in) EX: 5.965—5.980mm (0.2348—0.2354 in)”
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