How to Change the Oil in a 1987 Honda CR250: A Complete Guide
Shop parts for a 1987 Honda CR250 Dirt Bike.
Changing the transmission oil on your 1987 Honda CR250 is essential for keeping your bike in peak condition. Routine oil changes ensure smooth clutch operation and transmission longevity. Below you'll find a detailed, MotoSport.com exclusive guide—packed with the tools you need, step-by-step instructions, and model-specific tips just for your CR250.
Tools & Supplies Needed
- Oil drain pan
- 17mm socket or wrench (for drain bolt)
- 10mm socket or wrench (for check bolt, if equipped)
- Funnel
- Measuring cup or Ratio Rite (to measure exact oil amount)
- Gloves (optional but recommended)
- Clean rags
- Fresh 10w40 transmission oil (Maxima MTL is commonly recommended)
Step-by-Step Instructions
-
Warm up the Motorcycle:–
Start the CR250 and let it idle for a few minutes. This helps the old oil drain out more easily by thinning it out.
Tip: Do this outdoors or in a well-ventilated area. -
Position the Bike:
Place the bike on a stand and make sure it's balanced. Slide your oil drain pan beneath the engine. -
Remove the Filler Cap:
Unscrew the oil filler cap from the right crankcase cover. This allows air in and makes draining faster. -
Remove the Drain Bolt:
Using your 17mm socket, carefully loosen and remove the transmission oil drain bolt. Let the oil drain completely into the pan.
Caution: The engine case is aluminum—do not overtighten or cross-thread bolts during reassembly. -
Inspect and Clean:
Wipe the drain bolt clean–inspect the crush washer and threads. Check underneath the engine for any buildup or leaks. -
Replace Drain Bolt:
Once the flow slows to a drip, install the clean drain bolt by hand, then torque to the manufacturer's spec: 8–12 N·m (6–9 ft-lb).
Over-tightening can damage the threads. -
Add Fresh Transmission Oil:
Measure out 650cc (approximately 0.69 US qt) of fresh 10w40 transmission oil—use your Ratio Rite or measuring cup for accuracy.
Pour the oil slowly into the filler hole using your funnel. -
Check Oil Level (Model-Specific Step):
The 1987 CR250 has an oil check bolt near the right-side case. To confirm level:
- Start the engine briefly to circulate the new oil. Shut the bike off and let it sit for a minute.
- Remove the oil check bolt (10mm). If oil flows out steadily, you have the correct level.
- If not, add oil slowly until it just starts to dribble out the check hole, then reinstall and tighten the check bolt to spec.
-
Reinstall Filler Cap:
Make sure the oil filler cap is securely tightened. -
Wipe Down & Dispose of Oil:
Wipe any drips or spills with a rag. Properly dispose of the old oil at a recycling center—never dump it.
Important Model-Specific Notes for the 1987 Honda CR250
- Drain bolt location: Lower right side of crankcase. Some older CR250s have small drain plugs—be sure you are removing the correct one (never remove a case screw).
- Recommended oil volume: 650cc for the 1987 CR250. Always verify with your manual for running modifications.
- Check bolt procedure: This model uses a check bolt for accurate oil level confirmation. Never skip this step as over or under-filling can damage the clutch or transmission.
- Oil change frequency: Honda recommends every 3 races or every 7.5 hours of run time for optimal performance .
- Crush washer: Replace if damaged or leaking to prevent drips from the drain bolt.
- Thread care: Both the case and bolts are soft aluminum—avoid over-tightening, which can permanently damage your engine case.
Final Tips for First-Time Owners
- Check your transmission oil for milky discoloration (a sign of clutch or seal leaks), metallic bits (possible gear damage), or foul odors. These warrant further investigation before your next ride.
- Always use oil designed for 2-stroke transmission/clutch use—motorcycle-specific oil prevents clutch slip and gear wear.
- Tracking your oil changes by hour-meter or riding time helps anticipate and prevent early transmission failures.
Your 1987 Honda CR250 deserves attentive care, and these steps—done right—will keep your dirt bike reliable for every lap, every trail, and every checkered flag.
Related Shopping Categories
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Shop Oil Fillers and Drain Plugs for a 1987 Honda CR250 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.