Showing specs for all NA & NB Miatas

Differential drive-pinion/ring-gear backlash — setup target (NA8)

≈0.00354–0.00433 in (0.09–0.11 mm)0.09–0.11 mm

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

Mark four ring-gear positions approximately 90° apart. Place the dial-indicator tip at a right angle to a ring-gear tooth and turn the two bearing adjusters equally to set this target. Recheck backlash after bearing-preload adjustment and inspect tooth contact using the full factory procedure. This record supplies the setup target only; also perform the cross-position inspection using the full factory procedure. Metric endpoints control over differing printed inch rounding. Owner resolution, 2026-10-16: retain 0.09–0.11 mm as the setup target. The contradictory 0.07 mm procedure wording is not used as an absolute backlash limit; no separate 0.07 mm variation specification is added.

Applies to
  • NA 1994–1997 (BP) — Actual 1994 factory evidence; other years in the approved family inferred with owner approval.
  • Verified in: 1994 Mazda MX-5 Miata Workshop Manual