Air Filter Cleaning & Replacement Guide for 1979 Honda CR250
Shop parts for a 1979 Honda CR250 Dirt Bike.
The 1979 Honda CR250 is a legendary two-stroke motocross machine, celebrated for its lightweight performance and simplicity. Keeping its engine protected against dust, dirt, and debris is crucial for power and longevity–that means regular air filter maintenance is essential. Below, MotoSport provides a proprietary, step-by-step approach tailored for owners of the 1979 CR250, keeping your bike running strong wherever you ride.
Key Notes for 1979 CR250 Owners
- Foam air filter: The 1979 CR250 uses a foam air filter, which requires cleaning and oiling for effective dust capture.
- Old-school design: The filter seal and fit are basic, so extra attention to a clean and properly oiled filter is critical to avoid engine damage.
- Check air boot: Dirt can easily fall into the air boot during removal if you aren't careful. Inspect and clean the boot each time to prevent unfiltered air from entering your engine.
- Replace if degraded: Early foam filters can deteriorate from age and cleaning agents. Inspect for tears, holes, or crumbling foam and replace with a high-quality modern equivalent if needed.
MotoSport Proprietary Air Filter Cleaning Steps
- Remove seat: Undo the seat bolts and lift the seat away to access the air filter assembly.
- Extract the filter: Unscrew the central element bolt, pull the air filter and cage assembly out carefully. Avoid knocking loose dirt into the air boot.
- Inspect air boot: Wipe the inside of the air boot with a clean rag; use a spray of contact cleaner if needed. Any dirt inside can be disastrous for your engine.
- Pre-clean: Remove excess dirt by gently tapping the filter or using low-pressure compressed air from the inside out.
- Degrease: Submerge the filter in a container of air filter cleaner or mild solvent to dissolve old oil and dirt. Gently knead, never wring, to prevent tearing the foam.
- Wash: Rinse the filter with warm, soapy water to remove remaining debris. Repeat until clean. Rinse thoroughly with water and squeeze dry.
- Dry completely: Allow the filter to air dry fully. Do not use direct heat, which could damage the foam structure.
- Inspect foam and seams: Check for signs of crumbling, splits, or insect damage. Replace the filter if any weakness is found.
- Oil the foam: Apply foam air filter oil. Work the oil evenly into all areas of the filter–any dry spots can let unfiltered dust through. A sealed plastic bag can be used to help distribute the oil evenly.
- Oil and grease the seal: Apply waterproof grease to the filter sealing edge before reinstalling to help create an airtight seal between the filter and airbox, blocking any bypassing dust.
- Reinstall filter & seat: Carefully reinstall the filter and cage assembly. Double-check the fit, ensuring no gaps. Bolt the seat back into place securely.
Replacement Instructions
- If the foam air filter shows excessive wear, tears, or won't clean up, replace it with a new high-quality element specific to the 1979 CR250 for best performance.
- Inspect the air filter cage as well–replace if broken or rusty.
Maintenance Tips
- Clean and oil the filter after every dusty ride or at a minimum, every 5-10 operating hours for the CR250's vintage engine.
- Always keep a spare, pre-oiled filter ready for quick swaps between rides.
- If riding in especially dirty or wet conditions, check and service your air filter even more often.
Properly maintaining your 1979 Honda CR250's air filter preserves power, prevents engine wear, and ensures your vintage motocrosser holds its legendary performance for years to come. MotoSport carries the right filters, oils, and parts to support your maintenance routine–ride confident, ride prepared.
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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.
