GOOFIT
Voltage Regulator Rectifier for Honda XL125, XL125S, CB125, CB125S (1984-1985) | OEM 31600-437-971
Voltage Regulator Rectifier for Honda XL125, XL125S, CB125, CB125S (1984-1985) | OEM 31600-437-971
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GOOFIT Vintage Series – Precision Voltage Regulator for Honda 125cc
Reliable power for your Honda classic. The GOOFIT Voltage Regulator Rectifier is a direct-fit replacement engineered specifically for the 1984–1985 Honda CB125 and XL125 series. On these classic machines, an aging regulator often leads to blown headlight bulbs and damaged batteries. This GOOFIT unit restores precise voltage management, protecting your hard-to-find vintage electrical components from surges.
Crafted with a focus on durability, this regulator uses a high-quality metal heatsink to manage thermal loads, paired with a sealed housing that is dustproof and moisture-resistant. It is designed to withstand the vibrations of a single-cylinder engine while delivering a stable charging current in all riding conditions.
Product Compatibility
This specialized unit is a direct replacement for:
- Honda XL125 / XL125S: 1985
- Honda CB125 / CB125S: 1984–1985
- OEM Part Number: 31600-437-971
Key Technical Specifications:
- Dimensions: 44.4mm x 33mm (1.75" x 1.3").
- Wire Length: 170mm (6.7").
- Mounting Hole: 6.3mm (0.25").
- Build Material: Corrosion-resistant metal alloy and high-grade plastic.
Why Choose the GOOFIT Vintage Honda Regulator?
- Stable Electrical Output: Modern internal circuitry provides much smoother voltage regulation than original 1980s technology, significantly extending the life of your battery and lighting system.
- All-Weather Reliability: The moisture-resistant sealing ensures that rain or road grime won't cause internal shorts, which is essential for dual-sport bikes like the XL125.
- Compact "Bolt-On" Design: With factory-spec dimensions and a 170mm lead, this unit installs easily into the original mounting location without the need for wire splicing or bracket modification.
- Superior Heat Management: The metal body acts as a dedicated cooling fin, drawing heat away from the electronics to ensure long-term reliability during high-RPM trail or street riding.
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Fitment FAQ
Will this part fit my specific model and year?
This voltage regulator rectifier is intended for This specialized unit is a direct replacement for; Honda XL125 / XL125S: 1985; Honda CB125 / CB125S: 1984–1985; OEM Part Number: 31600-437-971. It is best matched to original part number(s) 31600-437-971, 1984-1985. Key physical/spec details from the product data include GOOFIT Vintage Series – Precision Voltage Regulator for Honda 125cc, Wire Length: 170mm (6.7")., Mounting Hole: 6.3mm (0.25").. Use the compatibility table and product photos together before ordering.
Do I need to match the OEM part number?
Yes. Match your original part number to 31600-437-971, 1984-1985 before purchase. For this voltage regulator rectifier, also compare the OEM number, plug shape, pin count, mounting-hole distance, heat-sink style, and AC/DC charging-system type. This is especially important for Honda XL125/XL125S/CB125/CB125S models because similar model names can use different parts by year or trim.
What models or situations does this part not fit?
Do not order this voltage regulator rectifier for machines outside the listed compatibility, or for units with different pin counts, plug shapes, AC/DC system types, or mounting-hole spacing. If your original part number does not cross-reference with 31600-437-971, 1984-1985, treat the fitment as unconfirmed. Model years outside 1984–1985, 1984, 1985 should be verified separately. Do not rely only on the model name or engine size.
What should I check before ordering?
Before ordering, compare your original part with the photos and check the OEM number, plug shape, pin count, mounting-hole distance, heat-sink style, and AC/DC charging-system type. Confirm OEM/cross-reference number(s): 31600-437-971, 1984-1985. Recheck listed specs such as GOOFIT Vintage Series – Precision Voltage Regulator for Honda 125cc, Wire Length: 170mm (6.7")., Mounting Hole: 6.3mm (0.25").. If any connector, mounting point, size, or year detail is different, confirm fitment before installation.