fits model: Trx450r. make: Honda. year: 2004–2005.

( Manufacturer Part Number: 28261-HP1-670 ), ( Part Type: Start Spring Shaft Gear )
The **Honda 28261-HP1-670** is a precision-engineered kick-start spring shaft gear assembly designed exclusively for the **2004 2005 Honda TRX450R**, a legendary off-road ATV known for its rugged performance and reliability. This high-quality component plays a critical role in the bike s kick-start mechanism, ensuring smooth and efficient operation by converting the rider s leg power into rotational force to crank the engine. Crafted from durable, heat-treated steel, the spring shaft gear is built to withstand the demanding conditions of off-roading, including dust, debris, and repeated mechanical stress. Its robust design features a precisely machined gear tooth pattern that meshes seamlessly with the kick-start lever, reducing wear and preventing premature failure. The assembly includes a coiled spring that maintains consistent tension, allowing for a consistent and reliable kick-start motion even after prolonged use. Whether navigating rocky trails or tackling steep climbs, this gear ensures that the TRX450R s kick-start system remains responsive and dependable, a key factor in maintaining the bike s legendary off-road prowess. Replacing a worn or damaged spring shaft gear with this OEM-quality part restores optimal functionality, making it an essential upgrade for owners seeking to preserve their TRX450R s performance and longevity.
### **Pros and Cons of Buying a Honda TRX450R (2004-2005, Model HP1-670, Kick Start, Spring Shaft Gear)**
#### **Pros**
1. **Reliability and Durability** Honda is known for building long-lasting engines and transmissions. The TRX450R s 450cc parallel-twin engine is robust and capable of handling rough terrain with minimal maintenance if properly cared for.
2. **Off-Road Capability** Designed as an all-terrain vehicle (ATV), the TRX450R excels in mud, sand, and rocky trails. Its high ground clearance, long-travel suspension, and aggressive tires make it well-suited for serious off-roading.
3. **Kick Start Functionality** The inclusion of a kick start means you won t be reliant on a battery or electric starter in case of failure, which is useful in remote areas where charging options are limited.
4. **Spring Shaft Gear** The spring shaft drive system (instead of a traditional chain) reduces maintenance compared to a chain-driven ATV. It s less prone to stretching and requires fewer adjustments over time.
5. **Resale Value** Honda ATVs hold their value better than many competitors, especially well-maintained models. A 2004-2005 TRX450R in good condition can still fetch a decent price.
6. **Versatility** The TRX450R can be used for recreational riding, work (light hauling, trail clearing), and even light farming tasks, making it a practical choice for those with diverse needs.
7. **Proven Performance** The 450cc engine provides strong torque and acceleration, making it capable of towing small trailers or carrying passengers in some cases (though not officially rated for heavy loads).
8. **Ease of Maintenance** Compared to some Japanese or Chinese ATVs, Honda parts are widely available, and mechanics familiar with Honda engines can service it efficiently.
9. **Comfortable for Long Rides** The ergonomics of the TRX450R are well-designed for extended off-road use, with a stable seating position and good visibility.
10. **Classic Model Appeal** For enthusiasts, the 2004-2005 TRX450R is a well-regarded model in the Honda lineup, offering a balance of power and refinement that appeals to collectors and riders alike.
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#### **Cons**
1. **Age and Wear** Being from 2004-2005, the ATV may have significant mileage, leading to worn-out components like suspension, tires, and internal engine parts. Buyers should expect higher maintenance costs over time.
2. **Fuel Efficiency** The 450cc engine is not fuel-efficient by modern standards. It consumes more gas than smaller ATVs, which can be costly for frequent or long-distance use.
3. **Weight** The TRX450R is heavier than some modern ATVs, which can make it less maneuverable in tight or technical terrain compared to lighter, more agile models.
4. **Limited Modern Features** Unlike newer ATVs, the 2004-2005 model lacks advanced features such as electronic fuel injection (EFI), traction control, or modern suspension systems. This can affect performance in extreme conditions.
5. **Parts and Service Challenges** While Honda parts are available, finding a specialist for older models may be harder than for newer vehicles. Some mechanics may not be as familiar with the specific quirks of this generation.
6. **Noise and Vibration** Older ATVs tend to be noisier and vibrate more than modern, refined models. This can be uncomfortable during long rides.
7. **Potential for Rust or Corrosion** If the ATV has been stored improperly or exposed to moisture, rust can be an issue, particularly in critical areas like the frame, suspension, and undercarriage.
8. **Higher Running Costs** Older ATVs require more frequent maintenance (oil changes, spark plug replacements, chain/sprocket adjustments if applicable) compared to newer models with longer service intervals.
9. **Limited Customization Options** Modern ATVs offer more aftermarket parts and upgrades. The 2004-2005 TRX450R may have fewer options for tuning or modifying its performance.
10. **Safety Concerns** Without modern safety features like roll cages (common on newer ATVs) or advanced braking systems, riders may be more exposed to risks in accidents.
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### **Conclusion**
The **Honda TRX450R (2004-2005, HP1-670, kick start, spring shaft)** is a capable and reliable off-road ATV that remains a strong choice for riders who prioritize durability, simplicity, and proven performance. It is well-suited for those who:
- Need a heavy-duty ATV for work or serious off-roading.
- Prefer a low-maintenance, long-lasting machine with minimal electronic complexity.
- Are willing to invest in upkeep to keep it running smoothly.
- Appreciate Honda s reputation for reliability and resale value.
However, it is not ideal for those seeking:- Fuel efficiency or modern convenience features.
- Lightweight, high-performance handling.
- Minimal maintenance requirements (older ATVs require more attention).
- The latest safety or technological advancements.
If you find a well-maintained example with a clean service history, it can be an excellent purchase. If the ATV has high mileage or signs of neglect, budget for repairs and consider whether a newer model might better suit your needs.
### **Recommendation**
- **Buy it if:** You need a robust, no-frills ATV for work or off-roading, are prepared for maintenance, and can afford potential repairs. A thorough pre-purchase inspection is critical to avoid hidden issues.
- **Consider alternatives if:** You want better fuel efficiency, modern features, or a lighter, more agile machine. Newer Honda models (e.g., TRX450R with EFI) or well-maintained used ATVs from the last decade may offer better long-term value.
- **Negotiation Tip:** Always inspect the ATV for rust, suspension wear, and engine condition. Test the kick start, brakes, and tires thoroughly. If buying privately, aim for a price below market value to account for potential repairs.
Ultimately, this ATV is a solid choice for the right buyer one who values reliability over modernity and is willing to put in the effort to keep it running.
Starter gear is not complete It missing a few parts as you can see. Starter gear and idle from a 2005 TRX 450 R. Will work on 2004 and 2005 Honda TRX450R.