Air Filter Cleaning & Replacement Guide for 1987 Kawasaki KDX80
Shop parts for a 1987 Kawasaki KDX80 Dirt Bike.
The 1987 Kawasaki KDX80 is a classic trail bike famed for its lightweight performance – but to keep it running at peak power, maintaining its air filter is crucial. This guide, proprietary to MotoSport, walks owners through proper cleaning, inspection, and replacement of the air filter specific to the '87 KDX80.
Understanding Your KDX80 Air Filter Setup
The factory KDX80 uses a dual layer foam air filter fitted in a plastic airbox designed for solid dust protection with straightforward access for routine maintenance. Genuine components include:
- Case-Air Filter (Part #11011-1155)
- Cap, Air Filter (Part #11012-1405)
Dirt, moisture, and improper servicing can quickly rob the KDX80 of its performance – pay attention to your filter on a regular basis for best results.
How to Remove, Inspect, & Clean Your Filter
- Access the Airbox: Remove the seat using the release bolts. Use care not to strip hardware on this older chassis.
- Remove Filter Element: Unclip or unscrew the filter cover and gently slide out the foam filter. Inspect for tears, splitting, or heavy degradation — especially if it is an original filter or hasn't been replaced in years.
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Clean the Foam:
- Soak filter in a dedicated foam filter cleaning solution. Avoid gasoline as it breaks down foam cells.
- Massage gently. Rinse in warm water until fully clean.
- Squeeze out excess water without twisting or wringing so the foam's structure stays intact.
- Dry Completely: Air dry in a well-ventilated area. Do not use compressed air or heat sources which may shrink vintage foam.
- Apply Filter Oil: Once dry, apply motocross-specific air filter oil to the entire surface and knead for full saturation. Excess oil can drip dust into the intake, so blot away any puddling.
- Reinstall Carefully: Fit the filter snugly back into the airbox. Ensure there are no sealing gaps around the edges and secure the cap before replacing the seat.
When to Replace the Filter
If your foam element is brittle, torn, or remains dirty after cleaning, replace it. For the 1987 model, always choose filters that specify compatibility (KDX80 – 1984 to 1988). Dual layer foam filters are preferred for additional dust protection and easy maintenance. Routine replacement ensures the bike breathes easily and preserves top end power output.
Pro Tips Unique to the 1987 KDX80
- The vintage airbox & filter design was engineered for rugged off-road use, but seals can degrade — always check for a tight fit and no warping in the filter case.
- Early year models use proprietary filter sizing; avoid generic filters. KDX80 air filters from 1984-1988 are interchangeable for proper fitment.
- Periodically inspect the filter cap for cracking, as replacement parts may be limited for classic models. A poor seal can allow bypass dust and accelerate engine wear.
- Never substitute paper or non-foam elements. The KDX80 requires proper foam to maintain airflow and engine life.
Keep Your Classic Running Strong
The 1987 KDX80 is a legendary mini enduro machine, and diligent air filter care keeps it riding hard for generations. Clean your filter every few rides in dusty conditions, and replace with quality foam only. When in doubt, genuine and trusted aftermarket parts, specific to 1984-88 KDX80 models, are always the best choice.
Related Shopping Categories
Shop Air Filters for a 1987 Kawasaki KDX80 Dirt Bike.
Shop Air Filter Oil for a 1987 Kawasaki KDX80 Dirt Bike.
Shop Air Box Covers for a 1987 Kawasaki KDX80 Dirt Bike.
Shop Tools for a 1987 Kawasaki KDX80 Dirt Bike.
Shop Intake Parts for a 1987 Kawasaki KDX80 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.
