How to Change the Coolant in a 2013 Suzuki DRZ125
Shop parts for a 2013 Suzuki DRZ125 Dirt Bike.
Regular coolant changes are essential to maximize the longevity and performance of your 2013 Suzuki DRZ125. This guide outlines a proprietary step-by-step process, highlights key model-specific notes, and covers maintenance best practices that every DRZ125 owner should know before tackling a coolant flush.
Tools and Supplies Needed
- Pre-mixed 50/50 motorcycle coolant (silicate-free, phosphate-free)
- Drain pan
- Socket set (usually 10mm and 12mm for fasteners)
- Phillips screwdriver
- Protective gloves
- Shop rags
Step-by-Step Coolant Change Procedure
- Preparation: Place your DRZ125 upright on a stand or a level surface and let the engine cool completely. Do not attempt this with a hot engine—scalding coolant can cause serious burns.
- Remove Plastics: Unscrew and remove the side cover or plastics to access the radiator cap and water pump. Most DRZ125s require removal of a small plastic shroud on the left side. Use a 12mm socket if necessary.
- Drain Old Coolant:
Locate the water pump cover on the lower left side of the engine. Below it, find the coolant drain bolt (typically 10mm) and place the drain pan under the area.
Remove the radiator cap first to allow air to aid in draining, then loosen and remove the drain bolt. Allow all old coolant to fully drain from the system—tipping the bike slightly left and right can help. - Inspect and Flush (if needed): For routine services, flushing with distilled water may not be required but is recommended if coolant appears rusty or contaminated. Replace the drain bolt and torque snugly.
- Refill with Coolant:
Fill the radiator slowly with pre-mixed 50/50 motorcycle coolant until fluid is visible at the base of the cap neck.
Gently lean the bike left and right to help air pockets escape.
Some Suzuki models (such as the DRZ400) have air bleed screws, but most DRZ125 units do not. Simply filling slowly and tilting is sufficient. - Check for Air:
Start the engine with the radiator cap off and let it idle for a few minutes. Watch for air bubbles escaping; add coolant as needed until the level stabilizes.
Once no more bubbles appear and the coolant stays level, replace and tighten the radiator cap. - Final Steps:
Inspect for leaks around the drain bolt, water pump cover, and cap.
Refit plastics or side covers.
After one or two heat cycles and cooling periods, recheck radiator level and top off if needed.
Noteworthy DRZ125 Model Information
- No Air Bleed Screws: The DRZ125 cooling system is very basic and does not feature bleed screws or a thermostat–bleeding air is done by slowly filling and tipping the bike.
- Overflow Reservoir: Most DRZ125s do not have an overflow bottle. Do not overfill the radiator–fill to just below the neck.
- Coolant Capacity: Expect to use approximately 0.8 to 1 quart (0.75-1L) of coolant for a full fill.
- Routine Inspection: Periodically check hoses, clamps, and the radiator itself for signs of leaks or damage during coolant changes.
Important Tips for Longevity & Safety
- Only use a motorcycle-approved, pre-diluted coolant. Avoid automotive antifreeze–specific formulations are necessary for aluminum parts.
- Dispose of old coolant responsibly. Antifreeze is toxic to people, animals, and the environment.
- Never remove the radiator cap when the engine is hot.
- Perform a coolant change every 2 years, or as specified in your owner manual, for best results.
Related Shopping Categories
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Shop Temperature Sensors for a 2013 Suzuki DRZ125 Dirt Bike.
Shop Tools for a 2013 Suzuki DRZ125 Dirt Bike.
Shop Radiator Hoses for a 2013 Suzuki DRZ125 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.