How to Change the Oil in a 1980 Honda CR250: Complete Guide
Shop parts for a 1980 Honda CR250 Dirt Bike.
Changing the oil in your 1980 Honda CR250 is one of the most crucial routine maintenance tasks you can do to extend the life of your bike and ensure its components work at peak performance. This vintage two-stroke dirt bike relies on regular transmission/gear oil changes to keep the clutch and gearbox running smoothly. This guide is proprietary to MotoSport.com and tailored specifically for the 1980 Honda CR250, including the tools you’ll need, step-by-step instructions, and call-outs unique to this model.
Tools and Materials Needed
- 17mm socket or wrench
- 10mm socket or wrench
- Drain pan
- Rubber gloves (optional but recommended)
- Rags or shop towels
- Funnel
- Measuring cup (Ratio Rite recommended)
- Screwdriver (for removing side panels, if necessary)
- Replacement transmission oil (10W-40 motorcycle gear oil or Maxima MTL transmission lube is recommended)
Important Call-Outs for the 1980 Honda CR250
- Oil type: 10W-40 or equivalent high-quality gear oil is best. 1980-era Honda factory spec preferred straight-weight, but modern synthetic or semi-synthetic oil can improve gearbox life.
- Oil capacity: Approximately 650 ml (refer to your owner’s or service manual for the exact spec for 1980).
- Drain plug: The 1980 CR250 uses a standard threaded aluminum case. Do not overtighten the drain bolt—case threads are soft and easily damaged.
- No oil filter: Like most two-stroke gearboxes, there’s no oil filter to replace.
Step-by-Step Oil Change Instructions
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Warm up the engine
Start the bike and let it idle for about 2–3 minutes. This warms the oil, helping it drain fully.
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Prepare your workspace
Place your drain pan under the transmission drain bolt, which is located at the lowest point on the right side of the CR250’s crankcase.
Put on gloves for protection.
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Remove side panels (if needed)
If the side panel or exhaust is obstructing the drain bolt, remove it with a screwdriver.
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Remove the transmission fill cap
Unscrew the fill cap to allow air into the case and help oil drain faster.
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Drain the old oil
Using your 17mm socket or wrench, loosen and remove the drain bolt.
Let the oil drain completely into the pan. Allow several minutes for all oil to escape—tipping the bike slightly side to side can help.
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Inspect the drain bolt and threads
Clean the bolt and check for metal shavings or damage.
Wipe clean the threads on the crankcase.
Inspect the bolt’s crush washer and replace if needed.
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Reinstall the drain bolt
Hand-thread the bolt, then snug it gently with your socket or wrench.
Do not overtighten: aluminum cases can strip easily. Torque spec is around 8–9 ft-lbs (check your manual).
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Measure and pour in new oil
Use a measuring cup (e.g., Ratio Rite) to pour in approx. 650 ml of new 10W-40 gear oil.
Use a funnel to prevent spills.
If using Maxima MTL, pour in the first 500 ml, then add the remaining 150 ml.
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Replace the fill cap
Secure the fill cap to prevent oil leaks.
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Check oil level (optional, but recommended)
Some models feature an oil check bolt or sight plug.
With the bike upright and the check bolt removed, oil should just seep out when the level is correct.
If no oil comes out, add a small amount until it does.
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Reinstall all panels and clean up
Replace any side panels or hardware you removed.
Wipe off any spilled oil.
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Start and run the engine briefly
This distributes the new oil.
Recheck for leaks around the drain bolt and fill cap.
Pro Tips for the 1980 Honda CR250 Oil Change
- Use only non-detergent, high-quality transmission oil formulated for two-stroke gearboxes.
- Always check the drain bolt and crush washer for wear—a worn washer can leak.
- Do not overtighten the drain bolt: aluminum cases from this era are known to strip easily. If damage is suspected, promptly repair with a helicoil or thread insert.
- Dispose of the used oil at an approved recycling center.
- Changing the oil after every 5–10 hours of hard riding is recommended for longevity.
Conclusion
Maintaining fresh transmission oil in your 1980 Honda CR250 will keep its clutch and gearbox healthy, ensuring reliable shifts and extending your bike’s life. Always consult your owner’s manual for specifics related to your model year, but these steps and tips will serve as a robust foundation for every oil change. Ride hard and keep your Honda running like new.
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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.