How to Change the Oil in a 1980 Yamaha IT250

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If you're riding or restoring a 1980 Yamaha IT250, routine oil changes are crucial for prolonging engine life, especially since many of these classic dirt bikes have spent time sitting in garages or barns. This guide provides a comprehensive, step-by-step oil change procedure, including the required tools, model-specific advice, and important callouts for the IT250. All content is proprietary to MotoSport.com.

Required Tools and Materials

  • Socket wrench set (including metric sockets and extension)
  • Drain pan for collecting used oil
  • Clean shop rags
  • New engine oil (consult your owner's manual, but Yamaha two-strokes typically take standard 10W-40 four-stroke motorcycle oil for gearbox lubrication; check IT250 manual for confirmation)
  • Funnel
  • Replacement crush washer for drain bolt (optional but recommended)
  • Torque wrench (for reinstalling drain plug to correct specs if available)
  • Gloves (optional, for less mess)

Step-by-Step Instructions

  1. Warm Up the Engine

    Start the bike and let it run for 2-3 minutes to warm up the oil. Warm oil drains faster and carries away more debris. Shut the bike off and make sure it is securely on a stand, level ground, or a center stand if available.

  2. Locate the Oil Drain Plug

    The oil drain plug is typically underneath the engine case. Slide the drain pan under it before proceeding to avoid spills.

  3. Remove the Drain Plug

    Use your socket wrench to unscrew the drain bolt. Be careful—the metal may be warm. Let all the oil drain into your pan; this may take 5-15 minutes depending on the oil's temperature and how long it has been since your last change.

  4. Check and Replace the Crush Washer

    Inspect the crush washer on the drain bolt. If it's deformed or worn, replace it to prevent leaks. Clean the drain bolt and threads before reinstallation.

  5. Remove and Inspect the Oil Filter/Strainer (if equipped)

    The 1980 IT250 does not have a paper oil filter like modern bikes, but it features an internal oil strainer. Remove the strainer as described in your service manual (typically accessed by removing a cap or cover held on by bolts). Inspect for debris and clean it thoroughly with a solvent, letting it dry completely before reinstalling.

  6. Reinstall Components

    Reinstall the drain plug with the crush washer. Torque it to manufacturer's spec if possible (consult your manual, but 14–18 ft-lb is typical for Yamaha drain bolts of this era).

    If you removed the oil strainer, reinstall it and tighten the cover bolts securely but do not overtighten.

  7. Add Fresh Oil

    Find the oil fill cap (usually on the right side of the engine). Remove it and use your funnel to pour in the correct amount of fresh oil. For the 1980 IT250, the manual typically recommends approximately 700cc–800cc of fresh oil (check your owner's or service manual for the exact capacity).

  8. Check Oil Level

    Replace the oil cap, start the bike, and let it idle for a couple of minutes. Shut it off, wait a minute for oil to settle, then check the oil level using the bike's oil level window or dipstick. Top off as necessary. Do not overfill.

  9. Inspect for Leaks and Finish

    Inspect the drain bolt area and the oil strainer cover for leaks. Wipe down any spilled oil. Be sure to properly dispose of the old oil at a recycling facility or auto parts store.

Model-Specific Tips and Call-Outs for the 1980 Yamaha IT250

  • No Paper Oil Filter: The IT250 uses a metal oil strainer, not a modern paper cartridge oil filter. Ensure you clean this strainer thoroughly each time you change oil.
  • Engine Oil Type: Even though the IT250 is a two-stroke, the crankcase contains separate gear oil. Always use motorcycle-specific transmission oil, not engine or premix oil designed for the combustion chamber.
  • Crush Washer: Always check and ideally replace this part on the drain bolt to avoid leaks common in older bikes.
  • Check for Fuel or Water Contamination: Old IT models stored for years often have crankcase oil contaminated by water or fuel due to seal failures. Drain oil into a clear container for inspection—if you see milky fluid or a gasoline odor, investigate and fix the root cause.
  • Oil Change Interval: For hard use (enduro riding, heavy off-road), change oil at least every 10–20 hours of use or after every major ride for best longevity.

Additional Tips

  • Take time to clean around the oil filler and drain plug areas before beginning to prevent dirt from falling into the engine.
  • Keep a maintenance log for your IT250 to track oil changes and service intervals.
  • If your owner's or workshop manual is missing, replacements and scans are often available online or from vintage Yamaha forums.

Conclusion

Changing the oil on your 1980 Yamaha IT250 ensures continued smooth shifting and long clutch life for your classic dirt bike. With the correct tools, oil, and attention to detail, you can complete this job confidently and keep your IT250 ready for the next trail ride or vintage race day. For all your parts, oils, and gear, visit MotoSport.com—your destination for everything motorcycles.

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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.