Standard Ignition Distributor Rotor JR-78
Standard Ignition Distributor Rotor JR-78 - view 2
Standard Ignition Distributor Rotor JR-78 - view 3
Standard Ignition Distributor Rotor JR-78
Standard Ignition Distributor Rotor JR-78 - view 2
Standard Ignition Distributor Rotor JR-78 - view 3

Standard Ignition Distributor Rotor P/N:JR-78

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$7.99
MPN: JR-78
Item Package Quantity: 1
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Standard Ignition Distributor Rotor P/N:JR-78
Standard Ignition Distributor Rotor P/N:JR-78
$7.99

Keep spark reaching every cylinder with the Standard Ignition Distributor Rotor JR-78. It installs as a direct-fit replacement for the 1971-1973 Dodge Colt, 1972 Ford Courier, and 1974 Mazda 808, restoring the rotating link that carries high-voltage current inside the distributor.

  • Distributes the spark: mounts on the distributor shaft and rotates to transfer high-voltage current from the coil to each spark-plug terminal in the distributor cap, in the engine's firing order.
  • Fresh conductive path: a new rotor helps deliver a consistent spark where a worn, corroded, or carbon-tracked original has been misfiring.
  • Routine tune-up part: intended to replace the original rotor during scheduled ignition service.

Signs the original rotor may need replacing include rough running, hard starting, misfires, or hesitation traced to a cracked, burned, or carbon-tracked rotor. Because those symptoms can have other causes, diagnose the ignition system before replacing.

Interchange: D569 · 1234999201 · 1234999202 · MD602083 · JA915 · EP321 · 12336824 · 30103590960 · 12-0108 · 120108 · RA76 · 029024312 · 02902431291 · 2215718010 · 2215718011 · 2215722010 · 2215771311
Manufacturer part number JR-78 (also JR78)

This part cross-references / interchanges with the following part numbers:

D569, 1234999201, 1234999202, MD602083, JA915, EP321, 12336824, 30103590960, 12-0108, RA76, 029024312, 02902431291, 2215718010, 2215718011, 2215722010, 2215771311, JR-78

Frequently Asked Questions

What does this distributor rotor do?

It mounts on the distributor shaft and rotates to carry high-voltage current from the coil to each spark-plug terminal in the distributor cap, following the engine's firing order.

Which vehicles does the JR-78 fit?

It's a direct-fit replacement for the 1971-1973 Dodge Colt, 1972 Ford Courier, and 1974 Mazda 808. Check the Buyer's Guide tab to confirm it fits your vehicle.

How do I know if my rotor needs replacing?

Rough running, hard starting, misfires, or hesitation can point to a cracked, burned, or carbon-tracked rotor. Because other faults cause the same signs, diagnose the ignition system before replacing.

What other part numbers does the JR-78 replace?

It interchanges with many OE and aftermarket numbers, including D569, MD602083, JA915, EP321 and more. See the full Interchange list in the description above.

Should I replace the distributor cap at the same time?

Many owners renew the cap and rotor together during a tune-up so both wear parts are fresh, but replace the cap only if inspection shows it also needs service.

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