Showing specs for all NA & NB Miatas

Piston pin to piston clearance (NA6)

Clearance: -0.0002–0.0005 in (-0.005–0.013 mm)Clearance: -0.005–0.013 mm (-0.0002–0.0005 in)

Factory manualTaken from a Mazda factory workshop manual, with page citation.
Procedure

Measure pin and piston pin-hole diameters in X/Y directions at four points. Negative clearance is printed; do not replace it with zero. Replace piston and/or pin if outside specification.

Applies to
  • NA 1990–1993 (B6) — Other years inferred from 1990 factory evidence.
  • Verified in: 1990 Mazda MX-5 Miata Workshop Manual