How to Replace Light Bulbs on a 2025 Honda CB300R

Honda CB300R · 2025 · Light Bulbs

Light Bulb Replacement Guide: 2025 Honda CB300R

This guide covers every exterior light bulb position on the 2025 Honda CB300R, the latest iteration of Honda's popular Neo Sports Café naked bike. Bulb positions include the round H4 headlight (low/high beam combined), front and rear 1157NA amber turn signals, 1157 tail/brake light, and W5W (T10/194) license plate light. The CB300R shares its minimalist lighting platform with Honda's Neo Sports Café lineup.

Quick Reference Bulb Table

Difficulty & Time Estimate

• Difficulty Level: Beginner to Intermediate (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 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 Combined

The 2025 CB300R uses a single H4 (9003 / HB2) halogen headlight with combined low and high beam filaments, housed in the iconic round Neo Sports Café headlight unit. This is the same bulb type used across most of Honda's naked bike lineup.

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

Step 2: Remove the headlight housing fasteners. On the CB300R, the round headlight bucket is secured by two JIS Phillips-head screws on the sides of the housing, plus one 5mm Allen bolt on the top bracket. Use JIS drivers to avoid stripping.

Step 3: Carefully pull the headlight assembly forward, guiding the wiring harness through the opening. Set it on a soft cloth to avoid scratching the lens.

Step 4: Locate the H4 bulb at the rear of the headlight housing. Disconnect the 3-prong electrical connector by pulling it straight off the bulb base — do not pull on the individual wires.

Step 5: Remove the rubber dust boot sealing the rear of the headlight housing. Grip the tab and pull evenly.

Step 6: Release the wire retainer clip holding the bulb. Press the clip wire inward and unhook it from the retaining notch on the bulb base.

Step 7: Pull the old H4 bulb straight out of the housing. Do not touch the glass — handle by the metal base only.

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

Step 9: Insert the new bulb into the housing. H4 bulbs have three tabs at the base and a wide flat tab for correct orientation — the wide flat tab goes at the 6 o'clock position (bottom). Push firmly until fully seated.

Step 10: Reinstall the wire retainer clip over the bulb. It should snap securely into the retaining notch.

Step 11: Reinstall the rubber dust boot. Align any raised ribs with the housing groove and press evenly until fully sealed. Verify no gaps remain.

Step 12: Reconnect the 3-prong electrical connector, pushing firmly until it seats completely.

Step 13: Carefully guide the headlight assembly back into position, routing the wiring harness clean of any sharp edges.

Step 14: Test with the ignition ON before re-seating the housing. Cycle between low and high beam to confirm both filaments function.

Step 15: Reinstall the headlight housing screws and top bracket bolt. Tighten the JIS Phillips screws evenly — snug but not forced. Tighten the 5mm Allen bolt to approximately 7 Nm.

Step 16: Verify headlight beam alignment (see Tips section below).

Front Turn Signals (1157NA) — Amber

Step 1: The front turn signals on the CB300R are mounted on short stalks just below the handlebars on the fork upper brackets. Access the rear of each turn signal housing from behind.

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. The offset pins on the bayonet base ensure correct alignment.

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 area. You may need to crouch or lay the bike on its side stand for better access.

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: push gently and turn counterclockwise.

Step 5: Install the new 1157NA amber bulb: push in and turn clockwise to lock.

Step 6: Test before reassembly by activating the turn signal switch.

Step 7: Reinsert the socket and turn clockwise.

Step 8: Fully reseat the rubber access grommet.

Tail / Brake Light (1157) — Dual Contact

Step 1: Locate the tail light housing on the rear fender below the tail section.

Step 2: Remove the two Phillips screws (JIS) that secure the lens housing to the fender bracket.

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

Step 4: Identify the 1157 tail/brake socket (center or primary position; on the CB300R it is the larger central socket in the housing).

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. The offset pins ensure correct orientation — if it doesn't turn easily, you have the pins misaligned.

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 (brake lever or pedal applied), and turn signal flash. The 1157 bulb shares its socket with one of the turn signal filaments.

Step 10: Reinstall the housing and tighten the Phillips screws evenly.

License Plate Light (W5W / T10 / 194)

Step 1: Locate the license plate light positioned above or adjacent to the rear license plate holder on the tail section.

Step 2: Remove the small Phillips screw (#1 JIS) or push clip securing the license plate light lens cover.

Step 3: Gently pry the lens cover off to access the wedge bulb socket.

Step 4: Pull the old W5W wedge bulb straight out of the socket.

Step 5: Push the new W5W bulb into the socket. Wedge bulbs are polarity-free and can be inserted in either direction.

Step 6: Reinstall the lens cover and secure with the screw or push clip.

Step 7: Verify illumination with the ignition on.

Tips, Warnings & Common Mistakes

Headlight Alignment After Replacement

1. Park the CB300R upright on level ground, 25 feet from a flat wall or garage door.
2. Measure the distance from ground to center of the headlight.
3. Draw a horizontal reference line on the wall at the measured height and a second line 2 inches (50mm) below.
4. With low beam active, the top of the bright zone (hotspot cutoff) should be at or below the lower line.
5. Adjust using the vertical and horizontal adjustment screws accessible on the rear of the headlight housing. Turn the screws with a Phillips (JIS) driver.

LED vs. Halogen — Pros and Cons

LED Turn Signal Note: The CB300R uses a standard flasher relay. LED bulbs may cause hyper-flashing due to reduced current draw. Use model-specific LED bulbs with built-in resistors, or add external load resistors to each turn signal circuit.

Legal Notes & Important Warnings

• All lighting must comply with DOT / local road-use standards for your jurisdiction.
• Turn signals must emit amber light. White turn signals are not legal on public roads in most regions.
• LED headlight color temperature above 6000K (blueish tint) can fail vehicle inspection and may blind oncoming riders.
• The CB300R has a DC lighting circuit — the headlight is always on when the ignition is on.
• JIS Screw Warning (CRITICAL): Honda uses Japanese Industrial Standard (JIS) screws, not standard Phillips. Using a standard Phillips screwdriver can strip screw heads, cause cross-threading, and make future maintenance extremely difficult. Invest in a JIS driver set (PB Swiss, Vessel, or Sunshine tools make quality JIS drivers).
• Naked Riding Note: On the CB300R, the headlight is exposed to wind and road debris. After riding in rain or dusty conditions, check that the rubber dust boot is fully seated and that the lens is clear.

Common Mistakes to Avoid

Verification Notes for 2025 Model Year

The 2025 CB300R continues Honda's Neo Sports Café platform with largely carryover lighting components from recent model years. Verify the following against your owner's manual:

To verify all specifications, check your 2025 CB300R 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 CB300R Neo Sports Café platform. Always verify against your specific owner's manual before performing maintenance.