How To Change the Oil in a 2012 Honda CRF100F — MotoSport.com Guide

Shop parts for a 2012 Honda CRF100F Dirt Bike.

Routine oil changes help ensure the long life and performance of your 2012 Honda CRF100F. While the process is simple, this bike has a wet clutch and small engine where oil quality matters. Follow this robust, step-by-step guide developed by MotoSport.com to confidently change your oil and keep your CRF100F running at its peak.

Tools & Supplies You'll Need

  • 14mm socket and ratchet
  • Oil drain pan
  • Clean rags or paper towels
  • Oil funnel (clean and dry.)
  • Measuring cup (for oil, optional)
  • 1 US quart of recommended motorcycle oil (Honda recommends 10w-40 – do NOT use automotive oil or oil with additives.)
  • New crush washer for the drain bolt (recommended but not strictly required every change)
  • Gloves (to keep your hands clean)

Step-by-Step: Changing Oil on the 2012 Honda CRF100F

  1. Warm Up the Engine
    Start the bike and let it idle for 3–5 minutes. This helps the oil flow out smoothly and brings contaminants into suspension for easier draining.
    Tip: Never rev a cold engine hard. Let it idle gently.
  2. Prepare the Bike
    Turn off the engine. Make sure the motorcycle is upright on a firm, level surface, using a stand if possible for added safety and access.
  3. Remove the Oil Filler Cap/Dipstick
    Unscrew the oil filler cap/dipstick on the engine's right side. Set aside on a clean rag. This allows air in so oil can drain out easily.
  4. Drain the Old Oil
    Position the oil drain pan under the crankcase drain bolt (bottom of the engine, just below the shift lever area).
    Use the 14mm socket and ratchet to carefully loosen and remove the drain bolt. Watch for hot oil.
    Let the old oil fully drain. For best results, gently tilt the bike side to side (with care) to remove as much old oil as possible.
    Pro Tip: Replace the crush washer on the drain bolt to prevent drips.
  5. Clean and Reinstall the Drain Bolt
    Wipe the drain bolt clean. Inspect and replace the crush washer if it looks worn or deformed.
    Thread the bolt back in by hand first to avoid cross-threading, then tighten securely with the ratchet. Do not overtighten.
  6. Add Fresh Oil
    Place a clean funnel in the filler hole. Pour in approximately 1 US quart (0.95 liter) of 10w-40 motorcycle oil.
    Do not use a dirty funnel, and do NOT use oil additives – the owner's manual specifically warns this can damage your wet clutch and engine.
    Wipe any spills around the opening.
  7. Check the Oil Level
    Install the dipstick (do not thread in; just insert). Remove and check the oil level; it should be between the two marks.
    If low, add a small amount more oil and re-check. Do not overfill. Overfilling can cause frothing and reduce clutch performance.
  8. Start the Engine & Recheck
    Start and idle the bike for another 3–5 minutes. Shut it off and wait a minute or two for oil to settle.
    Re-insert the dipstick (clean again) and check oil level. Top off slightly if needed.
    Inspect under the engine for any leaks.
  9. Dispose of the Old Oil Properly
    Pour the used oil into a sealed container and take to a recycling center or auto parts store. Never pour into drains or onto the ground.
    Wipe up any spills and give the bike a final once-over.

2012 Honda CRF100F-Specific Tips and Callouts

  • This model uses a wet clutch. Only use motorcycle-specific oil formulated for wet clutches. Never use oil additives or automotive oils, as noted in the manual and by experts online.
  • Capacity is rated at about 1 quart (0.95L), making it simple to measure. If oil looks milky or very dirty, consider running a brief flush with fresh oil (run for 1 minute, then drain and refill).
  • The CRF100F family (including years before and after 2012) share this oil change procedure, drain bolt size, and fill amount. Always confirm your year/model, but this guide covers all CRF100Fs between 2004–2013.
  • A magnetic drain plug is an easy upgrade for extra engine protection and a quick way to monitor for possible metal debris.

Final Thoughts: Maintenance for Long Life

  • Change your oil every 6 months or 600 miles (whichever comes first), or more often for heavy riding.
  • Record each oil change type and date for reference and resale value.
  • MotoSport.com recommends picking up a quality oil and filter kit and always disposing of waste oil safely.

Changing your oil is the best thing you can do to keep your Honda CRF100F happy and running strong. For OEM and aftermarket parts, or more dirt bike maintenance advice, check out MotoSport.com.

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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.