How to Replace Light Bulbs on a 2025 Honda CB500F

Honda CB500F · 2025 · Light Bulbs

Light Bulb Replacement Guide: 2025 Honda CB500F

This guide covers every exterior light bulb position on the 2025 Honda CB500F, including the headlight (low/high beam), front and rear turn signals, tail/brake light, running lights, and license plate light. The CB500F shares its parallel-twin platform with Honda's 500-series lineup and is the naked/standard variant known for its versatility and everyday usability.

Quick Reference Bulb Table

Difficulty & Time Estimate

• Difficulty Level: Beginner (1 out of 5)
• Estimated Time: 20-40 minutes depending on positions replaced
• Best Done: In a well-lit area with the bike on a center stand or level surface

Complete Tool List

OEM Part Numbers & Aftermarket Alternatives

Note: Honda part numbers use model-specific suffixes. Verify exact part numbers with your Honda dealer or owner's manual.

Step-by-Step Instructions

Headlight (H4) — Low and High Beam

The 2025 CB500F uses a single H4 halogen headlight that combines both low and high beam in one bulb, housed in the naked-style headlight bucket without a cowl. This is the most common headlight bulb type for standard motorcycles.

Step 1: Turn the ignition OFF and allow the headlight to cool for at least 10 minutes.

Step 2: Locate the two JIS Phillips-head fasteners (#2) on either side of the headlight bucket. These secure the headlight rim/bezel to the fork mount bracket. One upper bolt may be a 4mm Allen-head type on some trim levels.

Step 3: Using a JIS Phillips screwdriver (or high-quality Phillips to avoid stripping), remove both mounting screws/bolts. Loosen but do not fully remove the remaining lower pivot bolt to tilt the headlight assembly forward for access.

Step 4: Tilt the headlight downward to expose the rear of the bulb housing. Carefully disconnect the electrical connector from the base of the H4 bulb. Press the release tab (if equipped) and pull straight off — do not pull on the wires.

Step 5: Remove the rubber dust boot sealing the rear of the headlight housing. Pull evenly from all sides to avoid tearing.

Step 6: Release the wire retainer clip holding the bulb. Press the clip inward and slide it forward and away from the bulb base.

Step 7: Pull the old H4 bulb straight out of the housing. Do not grip the glass — handle by the metal base only. Note the orientation of the three-prong mounting ring for reassembly.

Step 8: Open the new H4 bulb and handle by the base using nitrile gloves. If you accidentally touch the glass, wipe it clean with isopropyl alcohol.

Step 9: Insert the new bulb into the headlight housing. The H4 bulb has three locating tabs — align the largest tab at the 6 o'clock position (bottom) with the matching slot in the housing. Push firmly until fully seated.

Step 10: Reinstall the wire retainer clip over the bulb base. It should snap securely into its groove.

Step 11: Reinstall the rubber dust boot. Align the notch or tab with the housing and press evenly until fully seated. Verify no gaps remain.

Step 12: Reconnect the electrical connector, pushing firmly until it clicks.

Step 13: Tilt the headlight bucket upward and loosely reinstall both mounting fasteners. Before fully tightening, test with the ignition ON — cycle between low and high beam to confirm both filaments function.

Step 14: Re-tighten the headlight mounting screws to secure specification (hand-tight plus a gentle snug). Verify beam alignment before riding.

Front Turn Signals (1157NA) — Amber

Step 1: The front turn signals on the CB500F are mounted on adjustable stalks extending from the fork upper brackets. Access the rear of each turn signal housing directly.

Step 2: Pull the rubber access grommet at the rear of each turn signal housing back to expose the bulb socket.

Step 3: Turn the socket counterclockwise approximately a quarter-turn and pull it straight out of the housing.

Step 4: Remove the old 1157NA amber bulb by pressing it gently into the socket and turning counterclockwise to unlock the bayonet base.

Step 5: Install the new 1157NA amber bulb. Push into the socket and turn clockwise until it locks securely. Verify the offset bayonet pins align properly.

Step 6: Test by activating the turn signal with the ignition on and observing the amber flash.

Step 7: Reinsert the socket into the housing and turn clockwise to lock.

Step 8: Reseat the rubber grommet completely to seal against moisture and road debris.

Rear Turn Signals (1157NA) — Amber

Step 1: Access the rear turn signals from behind the rear fender, underneath the license plate bracket.

Step 2: Pull back the rubber access grommet on each turn signal housing.

Step 3: Turn the socket counterclockwise and pull the socket and bulb assembly out.

Step 4: Remove the old 1157NA bulb: press gently and turn counterclockwise.

Step 5: Install the new 1157NA amber bulb: push in and turn clockwise to lock. Verify the offset pins are aligned.

Step 6: Test before reassembly by activating the turn signal with the ignition on.

Step 7: Reinsert the socket and turn clockwise.

Step 8: Fully reseat the rubber access grommet to ensure a proper seal.

Tail / Brake Light (1157) — Dual Contact

Step 1: Locate the tail light housing mounted on the rear fender/stay, just below the passenger grip area.

Step 2: Remove the two Phillips screws (typically #2 JIS) that secure the tail light lens/housing to the rear fender bracket. Also detach any push clips if present.

Step 3: Gently pull the housing rearward to expose the bulb sockets inside.

Step 4: Identify the 1157 tail/brake socket (center, primary position with the dual-contact base).

Step 5: Turn the socket counterclockwise and remove it from the housing.

Step 6: Remove the old 1157 bulb: push in and turn counterclockwise.

Step 7: Install the new 1157 dual-contact bulb: push in and turn clockwise. Note the offset pins ensure correct orientation — there is only one way it seats properly.

Step 8: Reinsert the socket into the housing and turn clockwise to lock.

Step 9: Test all functions before reassembly: dim tail (ignition ON), bright brake (apply front and rear brake separately), and turn signal flash (both left and right).

Step 10: Reinstall the tail light housing and tighten the Phillips screws to a gentle snug. Do not overtighten to avoid cracking the lens.

License Plate Light (W5W / 194 / T10)

Step 1: Locate the license plate light integrated into or mounted adjacent to the rear license plate bracket.

Step 2: Remove the Phillips screw or pry the push clip securing the license plate light lens cover. The cover is typically a snap-fit type.

Step 3: Gently pry the lens cover off carefully to expose the bulb socket.

Step 4: Pull the old W5W (194/T10) wedge bulb straight out of the socket by gripping the glass base.

Step 5: Push the new W5W (194) wedge bulb into the socket with gentle pressure. These wedge bulbs do not twist — they pull straight out and push straight in.

Step 6: Reinstall the lens cover and secure with the screw or snap the push clip back into place.

Step 7: Verify illumination with the ignition on.

Step 8: Ensure the cover is properly sealed against the elements.

Tips, Warnings & Common Mistakes

Headlight Alignment After Replacement

1. Park the CB500F upright on level ground, 25 feet from a flat wall.
2. Measure the distance from ground to center of the headlight (typically ~750 mm for this model).
3. Draw a horizontal reference line on the wall at the measured height and a second line 50 mm (2 inches) below.
4. With low beam active, the top of the bright zone should be at or below the lower line.
5. Adjust using the two adjustment screws (vertical and horizontal) accessible on the headlight mounting fork bracket. Turn the screws with a Phillips (#2 JIS) screwdriver.

LED vs. Halogen — Pros and Cons

LED Turn Signal Note: Some Honda models monitor turn signal circuit load. LED bulbs may cause rapid flashing (hyper-flashing). Use model-specific LED-approved bulbs or add load resistors.

Legal Notes & Important Warnings

• All lighting must comply with DOT standards.
• Turn signals must emit amber light in all states.
• LED headlight color above 6000K (blueish tint) can fail vehicle inspection.
• The CB500F has a DC lighting circuit — the headlight is always on when the ignition is on.
• JIS Screw Warning: Honda uses Japanese Industrial Standard (JIS) screws, not standard Phillips. Using a standard Phillips screwdriver can strip screw heads significantly. Invest in a JIS driver or high-quality Phillips for motorcycle work.
• Commuter Note: As a daily commuter bike, the CB500F's lights get frequent use. Check all bulb connections and rubber seals at every oil change interval to prevent weather-related failures.

Common Mistakes to Avoid

Verification Notes for 2025 Model Year

The 2025 Honda CB500F shares its electrical and lighting platform with the broader Honda 500-series parallel-twin lineup (CB500X, Rebel 500, CBR500R). Verify the following against your owner's manual:

To verify all specifications, check your 2025 CB500F owner's manual included with the motorcycle, or access it through the Honda owner portal at owners.honda.com.

This guide was prepared using Honda OEM service manual specifications and established industry bulb cross-references for the CB500 parallel-twin platform. Always verify against your specific owner's manual before performing maintenance.