How to Change the Coolant in a 2016 Suzuki DRZ125L: Step-by-Step Guide

Shop parts for a 2016 Suzuki DRZ125L Dirt Bike.

Regularly changing the coolant in your 2016 Suzuki DRZ125L is crucial for keeping the engine running cool, preventing corrosion, and avoiding costly damage to the cooling system. Follow this proprietary MotoSport guide tailored for the DRZ125L and keep your dirt bike ready for the trail.

What You Need

  • Fresh coolant (pre-mixed or concentrate – if concentrate, mix 50/50 with distilled water only)
  • Drain pan
  • Phillips and flathead screwdrivers
  • Socket set
  • Funnel
  • Fresh sealing washer for drain bolt (recommended)
  • Gloves

Before You Start

  • Make sure the engine is completely cool to avoid burns.
  • Work in a well-ventilated area to avoid inhaling fumes.

Step 1: Remove Necessary Covers

Remove the seat and side panels to access the radiator cap and reservoir on the left side of the bike. Use a Phillips screwdriver where needed.

Step 2: Drain the Old Coolant

  • Place the drain pan below the water pump (lower right side of the engine).
  • Locate and remove the coolant drain bolt – usually found at the bottom of the water pump housing. Remove the radiator cap to help the coolant drain more freely.
  • Allow the system to drain completely.

Step 3: Flush the System (Recommended)

For a full flush, pour distilled water through the radiator filler neck, reinstall the drain bolt, and run the engine for a couple of minutes. Then, allow it to cool and drain again. Repeat until the draining water is clear, then fully drain before proceeding.

Step 4: Reinstall the Drain Bolt

  • Install a new sealing washer on the drain bolt for best results.
  • Tighten the drain bolt securely but do not over-torque.

Step 5: Add Fresh Coolant

  • Using a funnel, pour the fresh (and properly mixed) coolant into the radiator filler neck until full.
  • Also check and fill the coolant reservoir to the upper line.

Step 6: Burp the Cooling System

  • With the radiator cap off, start the engine and let it idle for several minutes.
  • Gently rock the bike side to side and lightly rev the throttle. This helps remove trapped air from the system.
  • Once the fluid level drops (as air escapes), top up the coolant to the base of the radiator filler neck.
  • Turn off the engine and let it cool fully. Double-check and top off the radiator and reservoir if needed.
  • Reinstall the radiator cap firmly.

Step 7: Reassemble and Clean Up

  • Reinstall the seat and side panels.
  • Dispose of the old coolant properly at a recycling center or auto parts store.

Model-Specific Notes for the 2016 Suzuki DRZ125L

  • Simple air-cooled maintenance: The DRZ125L is a straightforward, air-cooled dirt bike so coolant changes are usually less complex than on liquid-cooled racing models.
  • Regular interval: Suzuki recommends changing coolant every two years or sooner under severe conditionsoff-road riding qualifies as severe.
  • Check coolant type: Use only recommended motorcycle coolant to prevent corrosion of aluminum cooling components.

Pro Tips

  • Never use tap water to mix with coolant. Tap water can introduce minerals that damage your cooling system.
  • Always check your work for leaks after the first ride and monitor coolant level for the next couple outings.
  • If the coolant continues to drop or the bike overheats, inspect for underlying problems like a leaking gasket or damaged radiator cap.

Keeping up with routine maintenance like coolant changes ensures your Suzuki DRZ125L stays reliable on the track – and MotoSport has all the parts and supplies you need for every ride.

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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.