How to Change the Coolant in a 2025 Kawasaki KX112
Shop parts for a 2025 Kawasaki KX112 Dirt Bike.
The 2025 Kawasaki KX112 is a high-performance mini motocross bike built for durability and speed, but routine maintenance like changing the coolant is vital to keep the engine running cool lap after lap. Here's a step-by-step proprietary guide, unique to MotoSport.com, designed specifically for KX112 owners.
What Makes the KX112 Unique
The KX112's performance two-stroke engine delivers more power and operates at higher temperatures than smaller trail bikes. Because of its compact design, pay close attention to coolant level and use only high-quality ethylene glycol-based coolant designed for aluminum radiators. The KX112's specific coolant capacity, layout, and drain/bleed bolt sizes also require careful attention during service for optimal results.
Tools & Supplies Needed
- 10 mm socket or wrench (for bolts)
- Clean catch pan or bowl
- High-quality dirt bike coolant (e.g., Engine Ice or brand recommended for aluminum systems)
- Distilled water (for flushing only, not as coolant)
- Funnel
- Paper towels or rags
- Torque wrench (optional, but recommended for bolt tightening)
- Protective gloves
Step-By-Step Coolant Change for the 2025 KX112
- Ensure the engine is completely cool before beginning. Hot coolant is under pressure and can cause burns.
- Remove the radiator cap carefully to release any built-up pressure. The radiator cap is located on top of the right radiator.
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Locate and remove the coolant drain bolt on the water pump (right side, bottom of engine). Place your catch pan under the bolt to collect the old coolant.
Note: Some KX112 models may have a second drain bolt on the cylinder. Both are usually 10 mm. - Open the air bleeder bolt at the top of the cylinder head to allow for smooth draining and prevent air locks. This step helps coolant drain out thoroughly and speeds up the process.
- Allow all coolant to drain. If needed, gently tilt the bike side to side to encourage full drainage.
- Reinstall and torque the drain and bleeder bolts according to the owner's manual specs. Do not overtighten to avoid stripping the threads.
- Optional: Flush the system by pouring distilled water into the radiator, reinstalling the cap, and briefly running the bike (just a minute or two). Repeat the drain process until the water runs clear. This is especially helpful if the old coolant looked dirty, rusty, or cloudy.
- Refill the radiator slowly with your new, high-quality coolant. Use a funnel to avoid spills and fill to just below the neck of the radiator.
- Start the engine and let it idle for a few minutes without the radiator cap installed. This allows air bubbles to escape and the new coolant to circulate.
- Top off the coolant if needed, then reinstall the radiator cap securely.
- Check for leaks around the drain, bleeder bolts, and radiator cap. Wipe up any spilled coolant with rags or paper towels.
- Dispose of old coolant properly–never pour used coolant into the ground, drains, or garbage. Take it to an approved recycling center.
KX112 Owner Tips
- Only use coolants safe for aluminum radiators. Standard automotive coolants can corrode the system and cause failure.
- Check hoses and clamps for wear every time you change coolant–replace if cracked or swollen.
- If the bike overheats after service, double check for trapped air by loosening the bleeder bolt and topping off as needed.
- Maintain the proper coolant level at every ride. The KX112's small radiator volume means neglecting coolant maintenance can lead to overheating and engine damage quickly.
Proper cooling system care will keep your 2025 KX112 running strong – and MotoSport.com has all the replacement parts, tools, and coolant you need to do the job right.
Related Shopping Categories
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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.