How to Change the Oil in a 1990 Honda CR125

Shop parts for a 1990 Honda CR125 Dirt Bike.

Changing the oil in your 1990 Honda CR125 is a straightforward process that you can accomplish with a few basic tools. Two-stroke engines like the CR125 do not have an oil reservoir for lubrication in the same way four-strokes do–instead, they use a premix of oil and gasoline. However, for the purpose of this guide, we will focus on the transmission and engine maintenance, as there is no engine oil reservoir to change. ### Tools Needed: - Socket or wrench for oil drain plug: A 17mm socket is commonly used. - Drain pan: To catch any spills. - New oil for the transmission (if applicable): Use a high-quality gear oil suitable for dirt bikes. - Gloves: For protection. - Safety glasses: Always wear safety glasses when working with tools and chemicals. - Workstand or jack: To support the bike during maintenance. ### Steps to Change the Oil: #### For the Transmission (if applicable): 1. Warm Up the Bike and Prepare: Start by warming up the bike slightly. This helps loosen any contaminants in the oil. However, for the CR125, which primarily uses a premixed oil-gas mixture for the engine, this step is more about preparing the transmission for oil changes if your model requires it. 2. Locate the Oil Drain Plug: On a typical dirt bike, the transmission oil drain plug might be located underneath. However, for the CR125, you might need to directly address the transmission fluid level without a drain plug for traditional oil changes. 3. Remove the Drain Plug: Use a 17mm socket to remove the plug if your bike has one. Be prepared with a drain pan to catch any spills. 4. Drain the Old Oil: Allow the old oil to drain completely into the pan. This may take a few minutes. 5. Replace the Drain Plug: Once the oil is drained, replace the plug and tighten it securely. 6. Add New Oil: Use a high-quality gear oil suitable for your bike. The CR125 typically does not require a traditional oil change, but for models with a transmission oil system, ensure the recommended amount is added. 7. Check the Oil Level: Use the oil level check bolt to ensure the oil level is correct. #### Specific Considerations for the 1990 Honda CR125:
  • Engine Lubrication: The CR125 uses a premixed oil and gasoline system for engine lubrication. This means you do not need to change oil in the engine itself. Instead, ensure you correctly mix the recommended oil with gasoline for the engine.
  • Transmission Maintenance: While the CR125 is primarily an engine premix system, any transmission or clutch maintenance should follow the manufacturer's guidelines for oil type and volume.
  • Regular Maintenance: Regularly check and maintain other critical components such as the chain tension, tire pressure, brakes, and suspension to ensure optimal performance and longevity of your bike.
By following these steps and considerations, you can maintain your 1990 Honda CR125 and ensure it runs smoothly and efficiently. Always refer to your owner's manual for specific recommendations and guidelines for your model.

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Disclaimer: This guide is provided for general informational purposes only and is not intended to replace your motorcycle's official owner's manual. Always refer to your manufacturer's documentation for model-specific instructions, torque specifications, safety procedures, and maintenance requirements. If you are unsure or inexperienced, consider seeking assistance from a qualified mechanic or technician.