BOYESEN MN-RJ3Z Pro Reeds Valve Gp MN/RJ3Z
fits make: Kawasaki. year: 1987–1996.
( Brand: Boyesen ), ( Manufacturer Part Number: MN/RJ3Z ), ( Compatible Year: 1996 1995 1994 1993 1992 1991 1990 1989 1988 1987 ), ( Compatible Model: Kx250 ), ( Bundle Description: 1 Pc Genuine Boyesen Replacement Pro Series Reeds For Rad Valve ), ( Type: Replacement Pro Series Reeds For Rad Valve ), ( Core Charge: Free No Core Charge ), ( Fitment Type: Direct Replacement )
Review BOYESEN Mn/rj3z Replacement Pro Series Reeds Rad Valve Kawasaki Gp fits 1987–1996
The Boyesen MN/RJ3Z Pro Reeds are a meticulously engineered upgrade designed to transform the performance of the Rad Valve system found in Kawasaki GPZ900R and GPZ1100 models from the years 1987 through 1996. These high-quality reeds are crafted from durable, precision-machined aluminum alloy, ensuring both longevity and reliability under the demanding conditions of high-performance riding. The RJ3Z designation signifies a refined tuning optimized for the GP s unique radial valve design, delivering a more aggressive and responsive throttle response while maintaining smooth operation across the entire RPM range. Unlike stock reeds, which can restrict airflow and limit power delivery, the MN/RJ3Z Pro Reeds feature a carefully balanced profile that enhances mid-range torque and top-end acceleration, making them ideal for both street and track applications. Their precise fitment eliminates the need for excessive gasket material, reducing the risk of leaks and ensuring a tighter seal that maximizes airflow efficiency. Whether you're chasing better throttle feel, improved acceleration, or a more engaging driving experience, these reeds provide a noticeable upgrade over stock components, allowing the GP s engine to breathe more freely while preserving the integrity of the Rad Valve system. Perfect for enthusiasts looking to fine-tune their bike s performance without compromising durability, the Boyesen MN/RJ3Z Pro Reeds are a straightforward yet effective solution for those seeking a competitive edge.
### Pros and Cons of Buying Boyesen MN/RJ3Z Pro Reeds for a Rad Valve on a 1987 1996 Kawasaki GPZ900R
#### **Pros**
1. **Performance Gains** Boyesen reeds are designed to improve airflow and throttle response, which can enhance acceleration and top-end power, especially in high-RPM scenarios. The MN/RJ3Z Pro series is optimized for modern tuning and high-performance applications, making them a step up from stock or aftermarket alternatives.
2. **Durability and Quality** Boyesen reeds are known for their robust construction, using high-grade materials that resist warping, cracking, or premature wear. The Pro line is particularly reinforced for durability, which is beneficial for aggressive riding or track use.
3. **Compatibility with Rad Valve** The Rad Valve system on the GPZ900R is already a performance upgrade over stock, and Boyesen reeds are engineered to pair well with it. The improved airflow coordination between the valve and reeds can yield noticeable power increases, particularly in the mid-to-high RPM range.
4. **Adjustability** Boyesen offers customizable reed sizes and strengths, allowing you to fine-tune airflow to match your riding style, fuel mixture, or engine modifications. This flexibility is useful if you plan to further modify the bike (e.g., porting, camshafts, or fueling upgrades).
5. **Reputation for Reliability** Boyesen is a well-established brand in the performance aftermarket, with a track record of producing reeds that hold up under heavy use. Many riders and tuners trust their products for serious modifications.
6. **Easier Installation** Compared to some other high-performance reeds, Boyesen s design is relatively straightforward to install, especially if you re familiar with carburetor work. The Pro series includes clear instructions and often comes with gaskets or mounting hardware.
7. **Potential for Better Fuel Economy (Under Certain Conditions)** While reeds primarily focus on performance, some riders report improved throttle response and smoother power delivery, which can indirectly lead to more efficient riding habits though this is situational and not a guaranteed benefit.
---
#### **Cons**
1. **Cost** Boyesen reeds are not cheap, especially the Pro series. For a GPZ900R, the price point may be prohibitive if you re on a tight budget or only seeking modest gains. The investment may not be justified if you re not planning further modifications or track use.
2. **Learning Curve** If you re new to reed modifications, there s a risk of improper installation (e.g., incorrect sizing, misalignment, or damage to the carburetor). Poor installation can lead to reduced performance, rough idle, or even damage to the carburetor or engine.
3. **Potential for Overkill** The GPZ900R s stock engine is already well-tuned for street use, and the Rad Valve is a significant upgrade. If you re not pushing the bike hard (e.g., track days, aggressive riding, or other mods), the gains from Boyesen reeds may be marginal. For casual riders, the cost may not be worth the incremental power.
4. **Maintenance and Wear** High-performance reeds can wear out faster than stock or lower-end alternatives, especially under heavy use. You ll need to monitor them for signs of damage (e.g., cracks, bent edges) and replace them if necessary, adding to long-term costs.
5. **Compatibility with Other Mods** If you ve already made other modifications (e.g., aggressive cams, porting, or fueling changes), Boyesen reeds may need to be paired with additional tuning (e.g., carburetor adjustments, ECU tweaks) to avoid issues like lean conditions or rough idle. This requires extra effort and potentially more expense.
6. **Risk of Voiding Warranty** If your bike is still under warranty (unlikely for a 1987 1996 model, but worth noting), modifying the carburetor with aftermarket reeds could void coverage. Always check your warranty terms before proceeding.
7. **Noise and Vibration** Higher-performance reeds can increase engine noise and vibration, which may not be desirable for street riding. Some riders find the change intrusive, especially in urban environments.
---
### **Conclusion**
Boyesen MN/RJ3Z Pro reeds are a **strong performance upgrade** for a 1987 1996 Kawasaki GPZ900R equipped with a Rad Valve, offering measurable gains in power, throttle response, and durability. They are best suited for riders who:
- Plan to use the bike aggressively (track days, high-speed riding).
- Are already making or intend to make other performance modifications (e.g., cams, fueling, exhaust).
- Have experience with carburetor tuning or are willing to invest time in learning the process.
- Can justify the cost based on their riding goals and budget.
However, for **casual riders** or those who prioritize cost efficiency over power, the benefits may not outweigh the expense. In such cases, lower-cost alternatives (e.g., stock reeds, basic aftermarket reeds, or even a well-tuned stock setup) might suffice.
If you decide to proceed, **proper installation and tuning** are critical to avoid negative side effects. Consider consulting a professional tuner or experienced mechanic to ensure the reeds are sized correctly and the carburetor is adjusted properly.
### **Recommendation**
**Buy the Boyesen MN/RJ3Z Pro reeds if:**- You re committed to maximizing the GPZ900R s performance, especially for track or high-performance street use.
- You re already making or plan to make complementary mods (e.g., cams, fueling, exhaust).
- You re prepared to invest in proper installation and tuning to avoid issues.
**Avoid them if:**- You re a casual rider who doesn t push the bike hard.
- You re on a tight budget and can achieve similar gains with less expensive mods.
- You lack experience with carburetor work and aren t willing to learn or seek professional help.
For most riders, the **Rad Valve alone** (with proper tuning) will provide a significant boost without needing reeds. However, if you re serious about performance, Boyesen reeds are a **high-quality choice** that can push the GPZ900R to its limits.
Details:
Boyesen Replacement Pro Series Reeds for Rad Valve 1987 - 1996 Kawasaki gp: Status: In Stock.
part #: mnrj3z price
- $74.37
specifications intakefuelmotorcycle:
- for makes: Kawasaki
- for years: 1987-1996
- brand: Boyesen
- mpn: Mn/rj3z
- compatible year: 1996 1995 1994 1993 1992 1991 1990 1989 1988 1987
- compatible model: Kx250
- bundle description: 1 Pc Genuine Boyesen Replacement Pro Series Reeds For Rad Valve
- type: Replacement Pro Series Reeds For Rad Valve
- core charge: Free No Core Charge
- fitment type: Direct Replacement
payments intakefuelmotorcycle:
- other
- wallet: Google-pay
- credit card: Mastercard
shipping intakefuelmotorcycle:
- cost: $0.00
- type: Fixed
- class: Standard
- service: Standard
- transit: 2-4 Days
offer intakefuelmotorcycle:
- sold: 0
- started: April 7, 2026
- quantity: 1
- options: Ship-to-home
- availability: In Stock
seller intakefuelmotorcycle:
- rating: 99.1%
- # reviews: 20527
- city: Multiple warehouses
returns intakefuelmotorcycle:
- policy: Returns Accepted
- paid by: Seller
- time: 30 Days
general intakefuelmotorcycle:
- Motorcycle Scooter Parts Accessories > Air Intake Fuel Delivery > Other Air Intake Fuel Delivery
- condition: New
Boyesen MN-RJ3Z Is Similar To:
- 011r Boyesen Power Reeds Reed Petal (41.7% similar) See if someone else accepted the delivery on your behalf at address. Generic image shown. Boyesen power reeds this item fits the following model's: kawasaki JS300 1988 1987 1986 300SX 1991 1990 1989 type: reed petal style: dual stage material: fiberglass sold as: each use a patented ...(November 23rd, 2018)
- 012r Boyesen Power Reeds (34.6% similar) Part: power reeds Boyesen 012R applications 1988 kawasaki JF650 X2 1988 JS650 650SX1989 X21989 TS1990 X21990 650SX1991 JL650 991 X21991 TS1992 650SX1992 992 X21993 650SX1993 993 TS1994 994 X21994 TS1995 995 X21995 TS1996 gifts use a patented dual stage fiberglass design for more air flow, ...(November 10th, 2018)
- 040444 Boyesen Boysen Pro Series (37.5% similar) Boyesen pro series reeds part number...(July 11th, 2017)
- Yz Power Reeds Yamaha Boyesen Yz60 11981-1983 60 (26.6% similar) More air flow, more air velocity and more power...(August 5th, 2014)
- 12 Boyesen Watercraft Power Reeds 804429000029 (41.3% similar) Expedited shipping via USPS priority mail with delivery confirmation is available. This occasionally happens, and is rare...(June 7th, 2018)
- 5243934 Boyesen New Pro Series Carbon Reeds Bin (44.1% similar) I really appreciate that. If I am at fault pay return shipping back to me. Boyesen pro series carbon reed 44 CR250 RM250 new in package bin 214 fast free USA shipping. This would make a great item for anyone...(July 14th, 2018)
- Stock Super 568sf1 Reeds Boyesen (30.4% similar) What makes us different let's face it. There are simply too many variables that apply to clothing sizing for the human body. You can even come in and see us at our newly re model ed retail store. Motorcycle market offers the best brand names and the highest quality goods. We, like any technology ...(September 11th, 2014)
- 601 Boyesen Power Reeds Dual Stage Fiberglass 804429002894 (37.7% similar) Improved engine efficiency and fuel economy for the long distance rider. More air velocity. The multi-port feature of bottom reed creates more channels for charge, delivering increased velocity to intake ports. More horsepower throughout the power band for guaranteed performance. Dual-stage reeds ...(May 1st, 2018)
- 603 Boyesen Power Reeds For 665760824718 (40% similar) Boyesen power reeds plus free contrasting sticker fits Yamaha YZ80 years 1980 through 1984 use a patented dual stage fiberglass design. More air flow, velocity and power...(July 12th, 2017)
- 604 Boyesen Power Reeds Dual 804429002924 (41.3% similar) Crisper throttle response for fast corner exits and surer jumps. More air velocity. The difference in stiffness between top reed and bottom allow reeds to respond quickly accurately changes engine pressure. The benefits price shown is for one set of reeds. Note: certain model's need to use the stock...(October 31st, 2017)
- 605 Boyesen Power Reeds Dual 804429002931 (41.3% similar) Improved engine efficiency and fuel economy for the long distance rider. More overall power. More horsepower throughout the power band for guaranteed performance. Compare the microfiche for USA model to your be sure they are same. The benefits price shown is for one set of reeds. Note: image may not...(September 1st, 2017)
