Standard Ignition JR-140 Distributor Rotor

Distributor Rotor for Nissan and Infiniti Applications

Standard Ignition JR-140 is a distributor rotor for Hitachi distributor systems used in select Nissan and Infiniti vehicles. It is built to transfer ignition voltage through the distributor assembly for consistent spark delivery in the correct firing sequence.

Key Features

• Distributor rotor for ignition distributor and magneto applications
• Direct-fit service part for select Nissan Sentra, Nissan NX, and Infiniti G20 models
• Contents: distributor rotor
• OE-style replacement referenced to Standard Ignition JR-140
• Cross-reference part numbers include National 3909 and EP310

Detailed Description

This Standard Ignition distributor rotor is used in Hitachi distributor setups found on 1991-1994 Nissan Sentra, 1991-1993 Nissan NX, and 1991-1994 Infiniti G20 models. The rotor routes ignition energy from the distributor cap terminal to the correct cylinder lead, helping maintain proper ignition timing and engine operation. If you are searching for a Nissan Sentra distributor rotor, Infiniti G20 ignition rotor, or a JR-140 replacement rotor for a Hitachi distributor, this part matches the listed applications.

This part cross-references National 3909 and EP310 for the same application.

What It Helps Address

• Misfire caused by worn rotor contact surfaces
• Hard starting related to weak distributor spark transfer
• Rough idle from inconsistent ignition routing
• Engine hesitation under load
• Ignition performance loss in aging distributor assemblies

Installation Notes and Tips

Verify distributor type before ordering, since this rotor is listed for Hitachi distributor applications. Inspect the distributor cap, rotor contact area, and related ignition components during service. Confirm the part number JR-140 against the vehicle application before installation.

Quality Assurance

Standard Ignition supplies ignition service parts for distributor repair and replacement applications. JR-140 is cataloged for the listed Nissan and Infiniti fitments and is identified by multiple interchange references for application matching.