How to change the oil in a 2021 GAS GAS MC 50 Dirt Bike

How to Change the Oil in a 2021 GAS GAS MC 50: Step–by–Step Guide

Shop parts for a 2021 GAS GAS MC 50 Dirt Bike.

Changing the oil in your 2021 GAS GAS MC 50 is a crucial aspect of routine maintenance, ensuring your mini motocross bike runs smoothly and reliably. MotoSport.com provides this proprietary, comprehensive guide to confidently handle this essential task—including tools required, specific steps, recommended oil, and expert tips for this particular make and model.

Tools and Supplies Needed

• Socket wrench (with appropriate size for drain bolt)
• Drain pan
• Measuring cup (for accurate oil measurement, ideally marked in milliliters)
• Shop towels or rags
• OEM crush washer for the drain bolt (replace with new each change)
• GAS GAS Motorex Cross Power 4T 10W/50 full synthetic oil, or equivalent
• Funnel (small size for easy filling)
• Gloves (to keep hands clean and protected)
• Oil filter (if required/desired by the manufacturer; see below for model notes)

Model-Specific Information: 2021 GAS GAS MC 50

• Gear oil capacity: 0.20 liters (200 milliliters)
• Recommended oil type: ATF Dexron III or Motorex Cross Power 4T 10W/50
• Be precise: The engine uses a small amount of oil; overfilling can cause performance issues
• The MC 50 features a magnetic drain plug that collects metal filings—inspect and clean this plug thoroughly at each oil change for optimal engine monitoring

Step-by-Step Oil Change Procedure

• 1. Prepare the Bike and Workspace
  – Place the bike on a level stand
  – Make sure the engine is cool to avoid burns and ensure thorough draining
  – Clean around the drain and fill area to reduce contamination
• 2. Remove the Oil Fill Cap
  – Locate the oil fill cap on the right side of the engine
  – Remove the cap to allow air to vent; this promotes proper drainage
• 3. Drain the Old Oil
  – Position a drain pan beneath the engine
  – Use the socket wrench to carefully remove the sump (drain) bolt at the bottom of the crankcase
  – Allow all oil to drain completely; this may take 10–15 minutes
  – Inspect the removed drain bolt: If it’s magnetic (it is on the MC 50), examine and clean away any metal particles with a rag before replacing
• 4. Replace the Crush Washer and Drain Bolt
  – Always install a new crush washer to prevent leaks
  – Hand-thread the drain bolt back in, then tighten with the socket wrench to the recommended torque—do not overtighten
• 5. Measure and Add Fresh Oil
  – Accurately measure 200 milliliters (0.20 liters) of approved oil using a measuring cup
  – With a funnel, carefully pour the new oil into the fill port
  – If you spill any, immediately wipe it up to prevent mess
• 6. Reinstall the Oil Fill Cap
  – Replace the cap and ensure it’s secure, but do not overtighten
• 7. Final Checks and Clean-Up
  – Start the engine and let it idle for a minute; look for leaks around the drain bolt and fill cap
  – Shut off the engine, wait a few minutes, then check oil level (via sight glass or dipstick, if equipped)
  – Dispose of your used oil and materials at a recycling center or auto parts store

Special Notes & Owner Call-Outs for GAS GAS MC 50 (2021)

• Unlike many larger dirt bikes, the MC 50 uses a small oil volume—precise measurement is critical. Over- or underfilling can hurt performance or damage the clutch.
• The stock oil type is ATF Dexron III, but many owners use Motorex Cross Power 4T 10W/50 full synthetic for enhanced clutch and gear protection; stick to one quality oil type for best results.
• Magnetic drain plug: The plug attracts small metal shavings generated by the clutch and gears; always inspect and clean it with each oil change for early warning of abnormal internal wear.
• The MC 50 does not use a traditional cartridge oil filter—all filtration occurs internally, so regular oil changes are even more essential for engine longevity.

Pro Tips from MotoSport.com

• Warm up the engine for 2–3 minutes before draining to help the oil flow better and carry out contaminants—just be careful, parts will be hotter.
• If your MC 50 sees a lot of heavy riding, change oil more frequently than the manual suggests; fresh oil is the best protection for a high-revving mini like the MC 50.
• Mark your calendar or use a log to track intervals and spot trends in the debris on your magnetic plug.

Summary

Changing the oil in a 2021 GAS GAS MC 50 is straightforward if you measure carefully and follow each step. Use high-quality oil, always clean the magnetic plug, and never skip the crush washer. Routine oil changes maximize clutch and engine life, keeping your MC 50 running strong for every ride.

Related Shopping Categories

Shop Motor Oil for a 2021 GAS GAS MC 50 Dirt Bike.

Shop Oil Filters for a 2021 GAS GAS MC 50 Dirt Bike.

Shop Oil Drain Pans for a 2021 GAS GAS MC 50 Dirt Bike.

Shop Tools for a 2021 GAS GAS MC 50 Dirt Bike.

Shop Oil Fillers and Drain Plugs for a 2021 GAS GAS MC 50 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.