How to Change the Oil in a 1999 Yamaha YZ250

Shop parts for a 1999 Yamaha YZ250 Dirt Bike.

Changing the oil in your 1999 Yamaha YZ250 is crucial for maintaining the longevity and performance of your dirt bike. Since the YZ250 is a two-stroke engine, it does not have an oil sump like four-stroke engines. Instead, the engine oil is mixed with gasoline (premix oil) and does not need to be changed as a separate fluid. However, you will need to change the gear box oil, which lubricates the transmission and clutch. ### Tools Needed: - A socket or wrench to remove the oil drain plug - A drain pan or oil pan to catch the oil - New gear box oil (approximately 0.85 US quarts) - A new copper washer for the drain plug - A rag for cleaning up spills - A funnel for pouring new oil ### Steps to Change the Gear Box Oil: 1. Warm Up the Engine: Warm up the engine by letting it run for a few minutes. This will help the oil drain more easily. 2. Turn Off the Engine: Turn off the engine and ensure it is stable to avoid any accidental starts. 3. Drain the Oil: - Place the drain pan under the bike. - Remove the oil drain plug from the bottom of the engine (usually located near the transmission area). - Let the oil drain completely. 4. Replace the Drain Plug: Once the oil has stopped dripping, replace the drain plug with a new copper washer to prevent leaks. 5. Refill the Gear Box Oil: - Use a funnel to pour in the new gear box oil. The recommended amount is approximately 0.85 US quarts. - Refer to your owner's manual for specific volume recommendations, as this can vary slightly between models. 6. Replace the Filler Cap: Once the oil is filled to the correct level, replace the filler cap. 7. Check for Leaks: Start the engine and let it run for a few minutes to circulate the new oil. Check the drain plug area for any signs of leaks. 8. Dispose of Used Oil: Properly dispose of the used oil by taking it to a recycling center. ### Specific Call-Outs for the 1999 Yamaha YZ250: - Oil Filter: Unlike four-stroke engines, the YZ250 does not have an oil filter that needs to be replaced during oil changes. - Pre-Mix Oil: For the engine, you will need to continue using pre-mix oil mixed with gasoline according to the manufacturer's recommendations. - Gear Box Oil Type: Ensure you use the correct type of oil for the gear box. It should be a high-quality gear oil designed for motorcycles. By following these steps, you will be able to maintain your 1999 Yamaha YZ250 and ensure it runs smoothly and efficiently. Always refer to your owner's manual for any specific recommendations or guidelines provided by Yamaha.

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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.