Factory build sheet
1984 Mazda RX-7 12A
Build JM1FB331-E · 1.1L · Coupe
VIN positions 1 through 8 read JM1FB331 and position 10 reads E. Those nine characters define this build. Position 9 and positions 11 through 17 differ on every car.
Every RX-7 whose VIN starts JM1FB331 and carries E in position 10 left the plant with the same engine, transmission, drivetrain and equipment listed below. We know of 30 of them.
- Decoded Jul 7, 2026
- 30 known VINs
- 1 listed for sale now
Factory specification
As filed by Mazda with NHTSA for this build. Fields the filing does not record are left out entirely — a missing row means no recorded value, not a missing feature.
Engine
- Displacement
- 1.1 L
- Displacement (CI)
- 70
- Engine model
- N2
- Horsepower
- 91 hp
- Fuel type
- Gasoline
Body & chassis
- Body class
- Coupe
- NHTSA body type
- PASSENGER CAR
- Doors
- 2
- Manufacturer
- MAZDA MOTOR CORPORATION
Weight rating
- GVWR class
- Class 1
- GVWR
- 6,000 lb or less
Gross vehicle weight rating is the loaded ceiling set by the manufacturer, not the car's own weight.
The same build, other model years
Mazda used the VIN pattern JM1FB331 for 4 model years. Nothing but the year changes between these pages, so the price gap between them is depreciation on an identical car.
How this VIN pattern is read
A 17-character VIN carries two kinds of information: what was built, and which one it is. This page is the first kind — the nine highlighted positions.
| Positions | Characters | What they encode |
|---|---|---|
| 1–3 | JM1 | MAZDA MOTOR CORPORATION · World manufacturer identifier |
| 4–8 | FB331 | Model, body style, engine and restraint system |
| 9 | × | Check digit — computed per vehicle, not part of the build |
| 10 | E | Model year — 1984 |
| 11 | × | Assembly plant |
| 12–17 | ×××××× | Production sequence number, unique to each vehicle |
30 vehicles carry this build
Every VIN we have decoded to JM1FB331-E shares the specification above.
- 30 Known VINs
- 1 Listed for sale now
- JM1FB331 5E0842429
- JM1FB331 3E0833471
- JM1FB331 0E0824761
- JM1FB331 3E0836225
- JM1FB331 XE0831586
- JM1FB331 XE0840045
- JM1FB331 1E0813218
- JM1FB331 8E0827102
- JM1FB331 8E0804810
- JM1FB331 XE0840255
- JM1FB331 7E0807505
- JM1FB331 8E0823891
- JM1FB331 5E0813402
- JM1FB331 5E0833262
- JM1FB331 7E0813160
- JM1FB331 2E0804964
- JM1FB331 8E0821297
- JM1FB331 5E0813853
- JM1FB331 5E0836663
- JM1FB331 9E0831675
- JM1FB331 7E0837748
- JM1FB331 4E0837660
- JM1FB331 2E0821764
- JM1FB331 4E0833494
- JM1FB331 0E0806292
- JM1FB331 1E0838975
- JM1FB331 9E0807750
- JM1FB331 8E0803379
- JM1FB331 9E0826220
- JM1FB331 1E0817415
Neighboring configurations
Other factory configurations of the RX-7, each with its own build sheet. The set is fixed by the VIN patterns themselves, so it does not shuffle as prices or inventory move.
Keep going
Where this data comes from
Specification fields are decoded from the manufacturer's filings in the NHTSA vPIC database, keyed on VIN positions 1–8 and 10. We publish the filed values as they stand and leave out anything the filing does not record.
Vehicle counts come from the 30 VINs of this build we have seen in dealer inventory. They are a sample of the road population, not a production figure.