1. Introduction
This instruction manual provides detailed guidance for performing a routine engine oil and filter change on Honda TRX650FA and TRX650FGA FourTrax Rincon models. Using genuine Honda parts ensures optimal performance and longevity for your vehicle's engine. This kit includes the necessary Honda GN4 10W-40 4-stroke motorcycle oil, a genuine Honda OEM oil filter, and a crush washer.
2. Kit Contents
Verify that your kit contains the following items:
- Three (3) Quarts of Honda GN4 10W-40 4-Stroke Motorcycle Oil: Formulated for motorcycle engines, providing shear resistance, viscosity stability, and cleanliness.
- One (1) Genuine Honda OEM Oil Filter: Designed for precise fit and filtration efficiency for your Honda engine.
- One (1) Crush Washer: For the oil drain plug, ensuring a proper seal and preventing leaks.

3. Safety Information
Always prioritize safety when performing maintenance. Failure to follow safety precautions can result in injury or damage to the vehicle.
- Ensure the vehicle is on a stable, level surface before beginning work.
- Allow the engine to cool down before draining oil to prevent burns from hot oil or engine components.
- Wear appropriate personal protective equipment, including gloves and eye protection.
- Keep a fire extinguisher nearby.
- Dispose of used oil and filters responsibly according to local regulations. Do not pour used oil down drains or onto the ground.
4. Preparation
Before starting the oil change, gather the following tools and materials:
- Socket wrench set (for drain plug and oil filter cover bolts)
- Torque wrench (for proper tightening of bolts)
- Oil drain pan (capacity of at least 3 quarts)
- Funnel
- Clean rags or shop towels
- New Honda Oil Change Kit (oil, filter, crush washer)
Vehicle Preparation:
- Start the engine and let it run for a few minutes to warm the oil. Warm oil drains more completely.
- Turn off the engine and place the vehicle on a level surface.
- Engage the parking brake.
5. Oil Change Procedure
Follow these steps carefully to perform the oil change:
- Drain Old Oil:
- Locate the engine oil drain plug, typically on the bottom of the engine crankcase.
- Place the oil drain pan directly beneath the drain plug.
- Carefully remove the drain plug using the appropriate socket wrench. Be prepared for hot oil to flow out.
- Allow all the old oil to drain completely. This may take several minutes.
- Replace Oil Filter:
- Locate the oil filter cover. Refer to your vehicle's service manual for the exact location.
- Remove the bolts securing the oil filter cover and carefully remove the cover.
- Remove the old oil filter. Note its orientation for correct installation of the new filter.
- Clean the oil filter cavity and the oil filter cover. Inspect the O-rings on the cover; replace if damaged.
- Install the new genuine Honda oil filter, ensuring it is seated correctly.
- Reinstall the oil filter cover and tighten the bolts to the manufacturer's specified torque.
- Reinstall Drain Plug:
- Once the oil has completely drained, clean the area around the drain plug.
- Install the new crush washer onto the drain plug.
- Reinstall the drain plug and tighten it to the manufacturer's specified torque. Do not overtighten, as this can damage the oil pan threads.
- Add New Oil:
- Locate the engine oil fill cap, usually on the top of the engine.
- Place a funnel into the oil fill opening.
- Slowly pour approximately 2.5 quarts of the new Honda GN4 10W-40 oil into the engine. The total oil capacity is 2.9 quarts.
- Replace the oil fill cap.
- Check Oil Level:
- Start the engine and let it idle for a few minutes to circulate the new oil. Check for any leaks around the drain plug and oil filter cover.
- Turn off the engine and wait a few minutes for the oil to settle.
- Remove the dipstick, wipe it clean, reinsert it fully, then remove it again to check the oil level.
- The oil level should be between the upper and lower marks on the dipstick. Add small amounts of oil as needed until the correct level is reached. Do not overfill.
6. Maintenance (Post-Change)
After completing the oil change:
- Regularly check your oil level between scheduled oil changes.
- Keep records of your oil changes for future reference and warranty purposes.
- Properly dispose of the used oil and filter at an authorized recycling center.
7. Troubleshooting
If you encounter issues after an oil change, consider the following:
- Oil Leak: Check the drain plug and oil filter cover for proper tightening and ensure the new crush washer was used. Inspect O-rings on the filter cover.
- Incorrect Oil Level: Re-check the oil level on a level surface after the engine has cooled for a few minutes. Add or drain oil as necessary.
- Engine Noise: If unusual engine noises occur, stop the engine immediately and re-check the oil level. Consult a qualified mechanic if the issue persists.
8. Specifications
| Component | Specification |
|---|---|
| Engine Oil Type | Honda GN4 4-Stroke Motorcycle Oil |
| Engine Oil Viscosity | 10W-40 |
| Total Oil Capacity | 2.9 US Quarts (2.75 Liters) |
| Oil Filter | Genuine Honda OEM Oil Filter |
| Manufacturer Part Number | hon-100 (for the kit) |
| Applicable Vehicle Models | Honda TRX650FA, TRX650FGA FourTrax Rincon (2004 models) |
9. Warranty and Support
For specific warranty information regarding genuine Honda parts, please refer to the documentation provided with your vehicle or contact an authorized Honda dealer. For technical support or further assistance, consult your Honda vehicle's official service manual or contact an authorized Honda service center.





