The Kawasaki KLR 250 is a versatile dual-sport motorcycle that has been a popular choice among adventure riders and off-road enthusiasts for decades. One of the key features of this bike is its liquid-cooled engine, which sets it apart from many of its air-cooled counterparts. In this comprehensive guide, we’ll dive deep into the water-cooled system of the KLR 250, exploring its technical specifications, maintenance tips, and more.
The Water Cooling System Explained
The KLR 250’s liquid-cooled 4-valve SOHC engine is designed to provide reliable performance and longevity, even in the most demanding riding conditions. The water cooling system consists of several key components:
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Radiators: The KLR 250 is equipped with a pair of frame-mounted aluminum radiators, each measuring approximately 8 inches tall and 5 inches wide. These radiators are positioned on either side of the bike, with dual plastic radiator scoops channeling air directly to the cooling fins.
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Coolant Pump: Located on the lower right side of the engine case, the coolant pump circulates the engine’s coolant through the system. This pump is driven by the engine’s crankshaft, ensuring a constant flow of coolant even at low RPMs.
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Coolant Hoses: The coolant is pumped from the engine case to the radiators and back through a series of reinforced rubber hoses. These hoses are designed to withstand the high temperatures and pressures of the cooling system.
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Thermostat: To maintain the optimal engine temperature, the KLR 250 is equipped with a thermostat. This component opens and closes to regulate the flow of coolant, ensuring the engine operates within its ideal temperature range.
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Coolant Reservoir: The coolant reservoir, located below the seat on the left side of the bike, allows for easy monitoring and topping up of the coolant level.
Technical Specifications
The KLR 250’s water-cooled engine boasts the following technical specifications:
| Specification | Value |
|---|---|
| Engine Type | Four-stroke, DOHC, four-valve, single cylinder liquid cooled |
| Displacement | 249 cc |
| Bore x Stroke | 74.0 x 58.0 mm |
| Carburetor | Keihin CVK34 |
| Compression Ratio | 11.0:1 |
| Power Output (1985-1989) | 28 horsepower |
| Power Output (1990-2005) | 23 horsepower @ 9,000 rpm |
| Maximum Torque | 23 N-m (2.3 kg-m, 16.5 ft-lb) @ 8,000 rpm (U.S. model) |
| Starting Method | Kick |
DIY Maintenance Tips
Maintaining the water cooling system on your KLR 250 is crucial for ensuring optimal performance and longevity. Here are some DIY maintenance tips to keep your bike running at its best:
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Coolant Level Check: Regularly check the coolant level in the reservoir located below the seat on the left side of the bike. Top up the coolant as needed, using a 50/50 mixture of distilled water and ethylene glycol-based coolant.
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Radiator Cleaning: Over time, the radiators can accumulate dirt, debris, and even insects, which can impede airflow and reduce cooling efficiency. Use a soft brush and water to gently clean the radiator fins, taking care not to damage the delicate cooling fins.
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Thermostat Replacement: If your KLR 250 is having trouble maintaining the optimal engine temperature, it may be time to replace the thermostat. This is a relatively simple task that can be done at home with basic tools. Refer to your owner’s manual or a trusted repair guide for detailed instructions.
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Coolant Flush and Replacement: It’s recommended to flush the cooling system and replace the coolant every 2-3 years, or as specified in your owner’s manual. This helps to prevent the buildup of contaminants and ensures the coolant maintains its heat-transfer properties.
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Hose Inspection: Regularly inspect the coolant hoses for any signs of cracking, leaks, or deterioration. Replace any damaged hoses to prevent coolant leaks and potential engine damage.
By following these maintenance tips, you can keep your KLR 250’s water cooling system in top condition, ensuring reliable performance and a long service life for your trusty dual-sport companion.