How to Change the Oil in a 1987 Yamaha YZ125

Shop parts for a 1987 Yamaha YZ125 Dirt Bike.

Changing the oil in your 1987 Yamaha YZ125 is a crucial maintenance task that ensures the dirt bike's engine runs smoothly and prolongs its lifespan. Here's a step-by-step guide to help you accomplish this task efficiently. ### Tools Needed - Drain pan– To catch the old oil. - Socket wrench or ratchet– With a 12 mm socket for the drain bolt. - Torque wrench– For tightening the drain bolt. - Measuring cup– To measure the new oil accurately. - Funnel– A long-necked funnel to pour in the new oil. - Oil filter wrench (if applicable)– For bikes with an oil filter. - New gasket or washer– For the drain bolt. - Recommended oil– For a 2-stroke engine like the YZ125, use a high-quality 2-stroke oil (e.g., Yamalube “2-R”) mixed with gasoline according to the manufacturer's instructions. ### Steps to Change the Oil 1. Prepare the Bike - Ensure the bike is on level ground. - Warm up the engine by running it for a few minutes to facilitate easier oil draining. 2. Locate the Oil Drain Bolt - For the YZ125, the oil drain bolt is typically located at the bottom of the engine. Refer to your manual if you're unsure. 3. Drain the Old Oil - Position the drain pan under the oil drain bolt. - Use a socket wrench or ratchet with a 12 mm socket to remove the bolt. Be prepared for the oil to start draining out. - Let the oil drain completely before proceeding. 4. Replace the Drain Bolt - Install a new gasket or washer on the drain bolt to ensure a proper seal. - Tighten the bolt securely using a torque wrench. The recommended torque specification is usually provided in the bike's manual. 5. Mix the New Oil - For a 2-stroke engine like the YZ125, mix the new oil with gasoline according to the manufacturer's recommendations. A common ratio is 30:1 (30 parts gasoline to 1 part oil). 6. Refill with New Oil - Use a funnel to pour the new oil-gas mixture into the fuel tank (if mixing directly with fuel) or into the engine if your model allows direct oil injection. - Ensure you add the correct amount of oil-gas mixture as specified in the owner's manual. 7. Check the Oil Level - While this isn't typically applicable for 2-stroke bikes mixed with fuel, always check the fuel level to ensure it's at the recommended mark. 8. Dispose of the Used Oil - Properly dispose of the used oil by taking it to a recycling center or an auto parts store that accepts used oil. 9. Clean Up - Clean any spills or drips around the drain area. ### Call-Outs for the 1987 Yamaha YZ125 - 2-Stroke Engine—Unlike 4-stroke engines, 2-stroke engines require oil to be mixed with fuel. Ensure you follow the correct mixing ratio to avoid engine damage. - Oil Type—Use a high-quality 2-stroke oil like Yamalube “2-R” for the best performance and longevity of your bike. - Maintenance Schedule—Regularly check your owner's manual for recommended maintenance intervals, especially for the engine and other critical components. By following these steps and understanding the specific needs of your 1987 Yamaha YZ125, you can ensure it continues to perform well and maintain its value over time. Always refer to your bike's service manual for specific details and recommendations tailored to your model.

Related Shopping Categories

Shop Motor Oil for a 1987 Yamaha YZ125 Dirt Bike.

Shop Oil Filters for a 1987 Yamaha YZ125 Dirt Bike.

Shop Oil Drain Pans for a 1987 Yamaha YZ125 Dirt Bike.

Shop Tools for a 1987 Yamaha YZ125 Dirt Bike.

Shop Oil Fillers and Drain Plugs for a 1987 Yamaha YZ125 Dirt Bike.

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.