BOYESEN MN-9MS8 Quickshot Accelerator Cover Fuel Pump Vj MN/9MS8

( Brand: Boyesen ), ( Manufacturer Part Number: MN/9MS8 ), ( Compatible Year: 2007 2006 2005 ), ( Bundle Description: 1 Pc Genuine Boyesen Quickshot Accelerator Pump Cover ), ( Type: Quickshot Accelerator Pump Cover ), ( Core Charge: Free No Core Charge ), ( Fitment Type: Direct Replacement )

Review BOYESEN Mn/9ms8 Quickshot Accelerator Pump Cover Honda Fuel Vj fits CRF450X 2005–2007

The **Boyesen MN/9MS8 QuickShot Accelerator Pump Cover** is a meticulously engineered, high-performance upgrade designed specifically for the **2005 2007 Honda CRF450X Fuel VJ**, ensuring optimal throttle response and fuel delivery under demanding riding conditions. Crafted from durable, heat-resistant materials, this precision-machined cover replaces the stock accelerator pump assembly, which is notorious for clogging, leaking, or failing under aggressive throttle inputs, particularly in off-road and high-stress applications. The **QuickShot** system eliminates the traditional diaphragm-based pump mechanism in favor of a **direct-fuel injection-like approach**, delivering a precise, high-pressure burst of fuel directly into the intake port upon throttle opening. This design drastically reduces lag, improves cold-start performance, and enhances overall throttle smoothness, making it an ideal choice for riders who demand reliability and responsiveness in rough terrain or high-speed trail riding. The **universal fitment** ensures compatibility with the CRF450X s fuel system without modification, while its **easy installation** requiring minimal tools and no special skills allows for a quick swap over the stock component. Whether tackling steep climbs, aggressive descents, or sustained high-RPM riding, the Boyesen QuickShot cover enhances fuel atomization, reduces carbon buildup, and extends the life of the carburetor by maintaining consistent airflow and pressure. Built to withstand the rigors of off-road use, this aftermarket upgrade is a game-changer for riders seeking to reclaim lost performance and eliminate the frustration of a sluggish accelerator pump.

### Pros and Cons of buying a Boyesen MN/9MS8 QuickShot Accelerator Pump Cover for a 2005-2007 Honda CRF450X Fuel VJ

1. **Improved Throttle Response** The QuickShot accelerator pump cover is designed to enhance fuel flow and atomization, which can lead to a more immediate and smoother throttle response. This is particularly noticeable when revving or accelerating quickly, especially in off-road conditions where quick power delivery is advantageous.

2. **Better Fuel Efficiency** By optimizing fuel delivery, the QuickShot can help reduce fuel waste, leading to slightly improved mileage. This is a subtle benefit but can be noticeable over time, especially in long rides or heavy use.

3. **Easier Installation** The Boyesen QuickShot is a straightforward, bolt-on modification. It doesn t require extensive mechanical knowledge or specialized tools, making it accessible for most riders to install themselves.

4. **Durability and Compatibility** Boyesen products are known for their quality and durability. The MN/9MS8 model is specifically designed to fit the 2005-2007 Honda CRF450X, ensuring a proper seal and reliable performance without compatibility issues.

5. **Positive Community Feedback** Many riders report noticeable improvements in throttle feel and power delivery after installing the QuickShot. Positive word-of-mouth and online reviews often highlight its effectiveness, particularly for riders who prioritize performance and responsiveness.

6. **Minimal Maintenance** Unlike some aftermarket modifications that require frequent adjustments or cleaning, the QuickShot is relatively low-maintenance. It doesn t add complexity to the bike s operation.

7. **Cost-Effective Upgrade** Compared to more extensive engine modifications or fuel system overhauls, the QuickShot is a relatively inexpensive way to achieve tangible performance gains without compromising reliability.

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1. **Mixed Results for Some Riders** While many users experience improved throttle response, others report little to no noticeable difference. This variability depends on factors like riding style, engine condition, and whether the bike was already running optimally. Expectations should be realistic it s not a dramatic power boost but rather a refinement.

2. **Potential for Fuel System Contamination** If the bike s fuel system isn t clean or if the QuickShot isn t installed correctly, there s a slight risk of fuel residue or debris entering the engine. This risk is mitigated by ensuring the system is clean before installation and using high-quality fuel.

3. **Not a Substitute for Other Modifications** The QuickShot is a minor modification and won t replace the need for more substantial upgrades like exhaust systems, air filters, or carburetor tuning if those are desired. It s best suited for riders looking for incremental improvements rather than significant power gains.

4. **Minimal Impact on Top-End Power** The QuickShot primarily affects low-to-mid-range throttle response. It won t provide a noticeable boost in high-RPM power or top-speed performance, which may disappoint riders seeking those specific gains.

5. **Installation Quality Matters** Improper installation, such as incorrect sealing or misalignment, can lead to fuel leaks or reduced effectiveness. Ensuring a tight, proper fit is crucial for optimal performance.

6. **Limited Longevity in Harsh Conditions** While durable, the QuickShot may wear out faster if exposed to extreme off-road conditions (e.g., mud, debris, or rough terrain) over time. Regular inspection is recommended.

7. **Aftermarket Dependence** Relying on an aftermarket part means there s no warranty from Honda, and replacement parts may not be as readily available as OEM components. However, Boyesen does offer warranties on their products.

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The Boyesen MN/9MS8 QuickShot accelerator pump cover is a **low-risk, moderate-reward modification** for the 2005-2007 Honda CRF450X. It offers tangible benefits in throttle response and fuel efficiency for riders who prioritize a smoother, more responsive ride without the complexity of major engine work. However, the gains are incremental, and results vary depending on individual riding conditions and expectations.

For riders who are dissatisfied with their bike s stock throttle feel or want a simple, cost-effective way to refine performance, the QuickShot is a worthwhile consideration. Conversely, those seeking significant power increases or top-end performance upgrades may find it insufficient on its own and should pair it with other modifications.

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- You want a noticeable improvement in throttle response and fuel atomization.

- You prefer a simple, bolt-on upgrade with minimal maintenance.

- You re already satisfied with your bike s power but want a more refined feel.

- You re open to trying aftermarket parts for incremental performance gains.

- You expect dramatic power increases or top-end performance boosts.

- Your bike s fuel system is dirty or neglected (clean it first for best results).

- You re on a tight budget and can t afford to experiment with aftermarket parts.

- You prioritize stock reliability and don t want to introduce any aftermarket components.

**Final Verdict:** The Boyesen QuickShot is a **solid, low-commitment modification** that s worth trying for riders looking to enhance their CRF450X s throttle feel. Pair it with good maintenance practices (clean fuel system, quality fuel) to maximize its effectiveness. If you don t notice a difference, it s an easy part to remove without long-term consequences. For most riders, the pros outweigh the cons, making it a recommended upgrade.

Details:

Boyesen Quickshot Accelerator Pump Cover for 2005 - 2007 Honda CRF450X - Fuel vj: Status: In Stock.

part #: mn9ms8 price

• $93.08

specifications intakefuelmotorcycle:

• for models: Crf450x
• for makes: Honda
• for years: 2005-2007
• brand: Boyesen
• mpn: Mn/9ms8
• compatible year: 2007 2006 2005
• bundle description: 1 Pc Genuine Boyesen Quickshot Accelerator Pump Cover
• type: Quickshot Accelerator Pump Cover
• core charge: Free No Core Charge
• fitment type: Direct Replacement

seller intakefuelmotorcycle:

• rating: 99.2%
• city: Multiple warehouses
• # reviews: 22442

payments intakefuelmotorcycle:

• credit card: Discover
• wallet: Paypal
• other

offer intakefuelmotorcycle:

• options: Ship-to-home
• started: May 9, 2026
• availability: In Stock
• quantity: 1
• sold: 0

general intakefuelmotorcycle:

• Motorcycle Scooter Parts Accessories > Air Intake Fuel Delivery > Other Air Intake Fuel Delivery
• condition: New

returns intakefuelmotorcycle:

• policy: Returns Accepted
• paid by: Seller
• time: 30 Days

shipping intakefuelmotorcycle:

• cost: $0.00
• service: Standard
• transit: 3-5 Days
• class: Standard
• type: Fixed

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