KAWASAKI 21118-1082 Decompressor

( Manufacturer Part Number: 21118-1082 ), ( Country Of Origin: Japan )

Review KAWASAKI Decompressor 95-99 fits BAYOU PRAIRIE 400 1999–2002

The **Kawasaki 21118-1082 Decompressor** is a precision-engineered, high-performance component designed exclusively for Kawasaki s legendary **1995 1999 Bayou 400** and **1999 2002 Prairie 400** models, ensuring optimal valve spring performance and longevity in these rugged, adventure-ready ATVs. Crafted from durable, heat-treated steel, this decompressor is engineered to reduce the compression force exerted on the intake and exhaust valves during the engine s power stroke, minimizing valve spring fatigue and preventing premature wear a critical feature for riders who demand reliability in demanding off-road conditions. The design incorporates a robust, spring-loaded mechanism that temporarily relieves valve tension, allowing the valves to open and close more smoothly while maintaining the engine s efficiency and power output. This component is particularly beneficial for riders who frequently operate their ATVs at high RPMs or under heavy loads, as it helps mitigate the stress placed on the valve train, reducing the risk of valve float or valve train failure over time. Installation is straightforward, requiring only basic hand tools, and the decompressor fits seamlessly into the stock valve cover assembly, ensuring compatibility without the need for modifications. Whether tackling rough terrain, towing heavy loads, or pushing the engine to its limits, the **21118-1082 Decompressor** enhances the durability and performance of your Kawasaki Bayou or Prairie 400, making it an essential upgrade for serious off-road enthusiasts who prioritize engine protection and longevity.

### **Pros and Cons of Buying a Kawasaki Decompressor Kit for a 1995-1999 Bayou 400 or 1999-2002 Prairie 400**

#### **Pros**

1. **Improved Cold-Weather Starting** The decompressor kit reduces compression in the cylinder, making it easier for the engine to turn over in cold conditions. This is particularly useful in colder climates where traditional ATVs may struggle to start without external assistance.

2. **Reduced Engine Wear** In freezing temperatures, a cold engine can be difficult to start, often requiring multiple cranking attempts. This can lead to increased wear on the starter motor, flywheel, and other drivetrain components. The decompressor minimizes this risk.

3. **No Need for External Heating Devices** Unlike electric starters or engine block heaters, the decompressor kit is a mechanical solution that doesn t require additional power sources or wiring modifications. It s a simple, plug-and-play upgrade.

4. **Retains Stock Performance** Once the engine warms up, the decompressor disengages, allowing the bike to return to its stock performance levels. There s no permanent loss of power or efficiency.

5. **Affordable Upgrade** Compared to other performance modifications, a decompressor kit is relatively inexpensive and easy to install, making it a cost-effective solution for riders in cold climates.

6. **Compatibility with Stock Components** The kit integrates seamlessly with the existing engine and carburetion system, meaning no major adjustments to fueling or ignition are required.

7. **Minimal Maintenance** Once installed, the decompressor requires little to no maintenance beyond ensuring the linkage remains clean and functional.

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#### **Cons**

1. **Limited to Cold-Weather Use** The decompressor is only effective when the engine is cold. Once the engine reaches operating temperature, the kit disengages, and there s no benefit during normal riding conditions.

2. **Potential for Increased Oil Consumption** Some riders report slightly higher oil consumption due to the reduced compression, though this is generally minor and not a major concern for most users.

3. **No Benefit in Warm Climates** If you primarily ride in mild or warm weather, the decompressor kit offers no practical advantage and may be seen as an unnecessary expense.

4. **Installation Requires Some Mechanical Skill** While the kit is designed for easy installation, it does require basic mechanical knowledge to properly mount the linkage and ensure it disengages correctly at operating temperature.

5. **May Void Some Warranties** If the ATV is still under warranty, installing aftermarket modifications like a decompressor kit could void coverage, depending on the manufacturer s policies.

6. **Not a Permanent Fix for Severe Cold** In extremely cold conditions (e.g., below freezing for extended periods), even a decompressor may not be enough. Some riders still opt for additional solutions like engine block heaters or electric starters.

7. **Potential for Misalignment or Failure** If the linkage is not installed correctly or becomes worn over time, it could fail to disengage properly, leading to rough idle or poor performance once the engine warms up.

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### **Conclusion**

The Kawasaki decompressor kit (part #21118-1082) is a practical and effective solution for riders who frequently operate their Bayou 400 or Prairie 400 in cold climates. It eliminates the frustration of cold starts and reduces wear on critical components, making it a worthwhile investment for those who experience seasonal temperature drops. However, it is not a universal fix riders in warm climates or those who rarely face freezing conditions may find little to no benefit from the kit.

For riders who prioritize ease of starting in cold weather and want to avoid the hassle of external heating devices, the decompressor kit is a simple, reliable, and low-cost upgrade. Those who already have reliable cold-start solutions or ride primarily in mild weather may choose to skip this modification.

### **Recommendation**

If you frequently ride your Kawasaki Bayou 400 or Prairie 400 in temperatures where starting can be difficult (e.g., below 32 F/0 C), installing the decompressor kit is highly recommended. It s a straightforward upgrade that pays for itself in reduced engine wear and frustration.

If you live in a warmer climate or already have reliable cold-start methods (e.g., electric starters, engine block heaters, or frequent warm-up rides), the decompressor kit may not be necessary.

For most riders in cold regions, the pros outweigh the cons, making this a smart and cost-effective modification. Always ensure proper installation and regular inspection of the linkage to maintain optimal performance.

Details:

Condition is New. Shipped with USPS Ground Advantage. KAWASAKI - 21118-1082 DECOMPRESSOR 95-99 Bayou 400 99-02 Prairie.

part #: 211181082 prices

• $58.01-$64.95

specifications azsnowmobiling:

• for models: 400, Bayou, Prairie
• for makes: Kawasaki
• for years: 1999-2002
• mpn: 21118-1082
• country of origin: Japan

shipping azsnowmobiling:

• cost: $0.00
• transit: 6-12 Days
• class: Standard
• service: USPS Ground Advantage
• type: Calculated
• carrier: USPS

general azsnowmobiling:

• condition: New
• Parts Accessories > Snowmobile Parts > Accessories

returns azsnowmobiling:

• paid by: Buyer
• policy: Returns Accepted
• time: 14 Days

offer azsnowmobiling:

• availability: In Stock
• started: February 11, 2026
• options: Ship-to-home
• sold: 0
• quantity: 1

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seller azsnowmobiling:

• # reviews: 2702
• city: Superior, Wisconsin
• rating: 100.0%

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