The specific model referenced designates a 125cc, two-stroke motocross motorcycle produced by Husqvarna in 2004. It represents a particular iteration of the CR125, a machine designed for competitive off-road racing. It is characterized by its engine displacement, two-stroke configuration, and Husqvarna’s design and engineering for the model year.
This model year is significant within the CR125’s production history. The 2004 version reflects technological advancements incorporated at that time, impacting performance characteristics like power delivery, handling, and suspension capabilities. Understanding its specifications allows for informed decisions regarding restoration, maintenance, or assessing its performance relative to other motorcycles.
Subsequent discussion will delve into the motorcycle’s technical specifications, performance characteristics, common issues associated with the model year, and resources available for maintenance and restoration. This information is intended to provide a detailed overview for enthusiasts and owners.
1. Engine Specifications
The engine specifications of the 2004 Husqvarna CR125 are fundamental to understanding its performance capabilities and maintenance requirements. These specifications dictate the engine’s power output, operating characteristics, and overall reliability.
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Bore and Stroke
The bore and stroke dimensions (typically measured in millimeters) define the cylinder volume and, consequently, the engine’s displacement. The 2004 CR125’s bore and stroke ratio directly influences its power delivery characteristics. A shorter stroke generally favors higher RPMs and peak power, while a longer stroke often enhances low-end torque. These measurements are critical for piston and cylinder replacement, ensuring proper fit and function.
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Compression Ratio
The compression ratio, a numerical value representing the ratio of cylinder volume at its largest to its smallest, is a crucial factor in engine performance. A higher compression ratio generally leads to increased power output but also necessitates higher octane fuel to prevent detonation. The 2004 CR125’s compression ratio is a critical parameter for determining appropriate fuel selection and assessing engine health during compression testing.
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Carburetion
The carburetor is responsible for mixing air and fuel in the correct proportions for combustion. The 2004 CR125’s carburetor specifications, including jet sizes and needle settings, directly influence throttle response, fuel efficiency, and overall engine performance. Proper carburetor tuning is essential for optimizing performance across various riding conditions and altitudes.
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Ignition System
The ignition system, consisting of components such as the spark plug, ignition coil, and CDI (Capacitor Discharge Ignition) unit, provides the electrical spark necessary to ignite the air-fuel mixture. The 2004 CR125’s ignition system specifications, including timing and spark plug type, are critical for ensuring proper combustion and preventing engine misfires or damage. Maintaining the ignition system is essential for reliable starting and optimal engine performance.
These engine specifications are interconnected and collectively determine the 2004 Husqvarna CR125’s performance profile. Alterations to any of these specifications can significantly impact the engine’s behavior and require careful consideration to maintain optimal performance and reliability. Referencing the factory specifications is vital during any maintenance or modification procedures.
2. Suspension Components
The suspension components of the 2004 Husqvarna CR125 are integral to its handling characteristics and overall performance on motocross tracks. The effectiveness of the suspension system directly influences the rider’s ability to maintain control, absorb impacts, and achieve optimal lap times. Understanding the specific components and their function is crucial for proper maintenance and tuning.
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Front Forks
The front forks on the 2004 CR125 are responsible for absorbing impacts from the front wheel and maintaining front-end stability. These forks typically consist of adjustable damping and spring preload settings, allowing riders to fine-tune the suspension to suit their riding style and track conditions. The specific type of fork used, such as conventional or inverted, affects its stiffness and responsiveness. Maintenance includes regular oil changes and inspection of seals and bushings to prevent leaks and ensure smooth operation. Improperly maintained or tuned forks can lead to poor handling, increased rider fatigue, and reduced control.
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Rear Shock Absorber
The rear shock absorber controls the rear wheel’s movement, working in conjunction with the swingarm and linkage system. Like the front forks, the rear shock typically features adjustable damping and spring preload. Adjusting these settings allows riders to optimize the suspension for different track conditions and rider weights. The shock’s performance is critical for maintaining rear-wheel traction and preventing excessive bottoming out. Regular maintenance involves inspecting the shock body for damage, checking for oil leaks, and ensuring the proper operation of the damping adjusters. A malfunctioning rear shock can result in poor handling, reduced traction, and increased risk of rider injury.
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Linkage System
The linkage system connects the rear shock to the swingarm, providing a progressive leverage ratio that affects the shock’s response to impacts. The design of the linkage system influences the suspension’s bottoming resistance and overall feel. Different linkage designs can alter the motorcycle’s handling characteristics and suitability for various riding styles. Maintenance of the linkage system includes regular lubrication of the bearings and inspection for wear or damage. Neglecting the linkage system can lead to binding, reduced suspension performance, and increased stress on the shock absorber.
Properly maintained and tuned suspension components are essential for maximizing the performance and safety of the 2004 Husqvarna CR125. Regular inspection, lubrication, and adjustment are necessary to ensure optimal handling and rider comfort. Understanding the individual components and their interactions allows riders and mechanics to fine-tune the suspension for specific track conditions and riding styles, ultimately enhancing the overall riding experience.
Conclusion
The preceding exploration of the 2004 Husqvarna CR125 has detailed critical aspects of the machine, including its engine specifications and suspension components. Understanding these elements is paramount for effective maintenance, restoration, and performance optimization. The information presented underscores the significance of proper technical knowledge when working with this model.
Owners and enthusiasts are encouraged to utilize this knowledge to ensure the longevity and optimal performance of the 2004 Husqvarna CR125. Continued research and meticulous attention to detail will contribute to preserving the legacy of this machine within the realm of motocross history. This information serves as a foundation for further exploration and responsible stewardship of this particular model.
