BFO QA3OE4 Stator Rotor Regulator Bigtwin Cam 29985-87

( Brand: Bfo ), ( Part Type: Rotor Stator Regulator Cam ), ( California Prop 65 Warning: California Prop 65 Warning ), ( Compatible Year: 1970, 1971, 1972, 1973, 1974, 1975, 1976, 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999 ), ( Manufacturer Part Number: QA3OE4 ), ( Oe/oem Part Number: 29985-87 ), ( Unit Type: Unit ), ( Universal Fitment: No ), ( Vintage Part: Yes )

Review BFO Stator Rotor Regulator Fit Harley Bigtwin Non twin Cam fits TWIN 1970–1999

The BFO QA3OE4 Stator Rotor Regulator is a crucial component for the electrical system of Harley-Davidson Big Twin motorcycles manufactured between 1970 and 1999, excluding the non-twin cam models with the part number 29985-87. This regulator is responsible for maintaining the correct voltage output from the charging system, ensuring a stable and efficient power supply to the motorcycle's electrical components.

The BFO QA3OE4 Stator Rotor Regulator is a robust and reliable design, built to withstand the rigors of motorcycle use. The regulator housing is made of a durable cast aluminum material, providing excellent heat dissipation and protection against the elements. The regulator features a three-wire design, with a voltage, ground, and ignition input wire.

The heart of the regulator is the stator rotor assembly, which uses a brushless design for improved reliability and longer service life compared to traditional brush-type regulators. The rotor assembly is driven by the engine's crankshaft, and its rotation generates a voltage signal that the regulator uses to regulate the charging system output.

The regulator has adjustable voltage output settings, allowing you to fine-tune the output voltage to match the specific requirements of your Harley-Davidson Big Twin motorcycle. This can be particularly useful for motorcycles with aftermarket modifications or accessory installations that may place additional demands on the electrical system.

The BFO QA3OE4 Stator Rotor Regulator is easy to install, with clear instructions included in the package. It is also compatible with most aftermarket battery chargers and maintenance systems, making it a versatile and practical choice for Harley-Davidson Big Twin owners.

In summary, the BFO QA3OE4 Stator Rotor Regulator is a high-quality and reliable component for the electrical system of Harley-Davidson Big Twin motorcycles manufactured between 1970 and 1999, excluding the non-twin cam models with the part number 29985-87. Its durable design, brushless technology, adjustable voltage output, and ease of installation make it an excellent choice for maintaining the electrical system of your Harley-Davidson Big Twin motorcycle in peak condition.

Buying a BFO QA3 OE4 stator rotor regulator for Harley Big Twin models from 1970 to 1999 (29985-87 non-twin cam) comes with several advantages and disadvantages. Here's a detailed analysis of each:

1. OEM Compatibility: This regulator is an original equipment replacement, meaning it's specifically designed to fit and function like the original part in your Harley-Davidson motorcycle.

2. Improved Charging System: A faulty or worn-out regulator can lead to poor charging system performance, which can cause issues with your motorcycle's battery and electrical systems. Replacing it with a new regulator can help improve your charging system's efficiency.

3. Longer Service Life: A new regulator will last longer than a used or worn-out one, ensuring that your motorcycle's electrical systems are reliable for a more extended period.

4. Peace of Mind: Knowing that you have a new, genuine OEM part installed in your motorcycle can give you peace of mind, especially when it comes to the charging system and electrical components.

1. Cost: OEM parts, including regulators, tend to be more expensive than aftermarket alternatives. This can be a significant disadvantage for those on a budget.

2. Availability: Depending on your location and the availability of the specific part from Harley-Davidson dealers or suppliers, you may experience delays in getting the part.

3. Installation Complexity: Installing a stator rotor regulator can be a complex process and may require professional assistance, which can add to the overall cost.

If you're looking for a reliable and efficient solution for your Harley-Davidson Big Twin's charging system, a BFO QA3 OE4 stator rotor regulator can be an excellent investment. Its OEM compatibility, improved charging system performance, longer service life, and peace of mind make it a worthwhile consideration. However, its higher cost compared to aftermarket alternatives and potential availability and installation complexities may be disadvantages for some.

If budget is not a concern and you value the reliability and performance that comes with an OEM part, then a BFO QA3 OE4 stator rotor regulator is an excellent choice for your Harley-Davidson Big Twin. If you're looking for a more cost-effective alternative, aftermarket regulators may be worth considering, but keep in mind that their performance and compatibility may vary. Ultimately, the decision depends on your priorities and budget.

part # qa3oe4 price

• $131.89

specifications ignitioncompo:

• for models: Twin
• for makes: Harley
• for years: 1970-1999
• brand: Bfo
• part type: Rotor Stator Regulator Cam
• california prop 65 warning: California Prop 65 Warning
• compatible year: 1970, 1971, 1972, 1973, 1974, 1975, 1976, 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999
• manufacturer part number: QA3OE4
• oe/oem part number: 29985-87
• unit type: Unit
• universal fitment: No
• vintage part: Yes

returns ignitioncompo:

• time: 30 Days
• paid by: Seller
• policy: Returns Accepted

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offer ignitioncompo:

• best offers: True
• sold: 0
• availability: In Stock
• options: Ship-to-home
• started: December 29, 2025

shipping ignitioncompo:

• type: Fixed
• service: FedEx Ground / FedEx Home Delivery
• carrier: FedEx
• transit: 2-7 Days
• cost: $0.00
• class: Standard

seller ignitioncompo:

• rating: 99.4%
• # reviews: 12550

general ignitioncompo:

• condition: New
• Motorcycle Scooter Parts Accessories > Electrical Ignition Components > Other Electrical Ignition Components

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