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  3. YAMAHA 2VN-1131A-01-00

YAMAHA 2VN-1131A-01-00 Cylinder Exhaust Power Valve

fits model: Yz125, Yz, 125. make: Yamaha. year: 1988.

2vn-1131a-01-00 Yamaha Used Oem 88 1988 Yz125 Yz 125 Cylinder Exhaust Power Valve Valves Assy

( Manufacturer Part Number: 2VN-1131A-01-00 ), ( Type: Exhaust Valve ), ( Country Of Origin: Japan )

Review YAMAHA Used Oem Cylinder Exhaust Power Valve Valves Assy fits YZ125 YZ 125 1988

The **Yamaha YZ125 2VN-1131A-01-00 (1988 model) cylinder exhaust power valve assembly** is a meticulously engineered component designed to optimize the performance and reliability of Yamaha s iconic 125cc two-stroke dirt bike engine. This specific part, identified by its unique **2VN-1131A-01-00** designation, plays a critical role in the bike s power delivery system by regulating the flow of exhaust gases and scavenging air within the cylinder. Manufactured to Yamaha s exacting standards, the assembly features a **precision-machined power valve** a key element in the bike s **reed valve system**, which ensures efficient combustion and smooth power output. The valve is crafted from high-quality materials, including durable metals and heat-resistant coatings, to withstand the intense thermal and mechanical stresses of high-performance riding. Its design incorporates a **spring-loaded mechanism** that allows for optimal timing of exhaust gas expulsion, reducing backpressure and improving engine efficiency. This assembly is fully compatible with the **1988 YZ125 s** carbureted engine setup, including the **Pike carburetor**, and is essential for maintaining the bike s legendary responsiveness and throttle control. Whether used for restoration, replacement, or performance tuning, this valve assembly ensures that the YZ125 delivers its signature blend of power, agility, and reliability making it a sought-after part for both vintage enthusiasts and competitive riders. Proper installation requires careful alignment with the cylinder head and reed valve housing, ensuring a tight seal to prevent air leaks that could compromise performance. As a genuine Yamaha component, it guarantees compatibility and durability, preserving the integrity of one of the most beloved dirt bikes of the late 1980s.

### Yamaha YZ125 (1988 Model) Pros and Cons

#### **Pros:**

1. **Classic Reliability** The YZ125 from the late 1980s was known for its durable, air-cooled single-cylinder engine, which was well-built for its time. Many owners report that with proper maintenance, these bikes can last decades.

2. **Simplicity and Low Maintenance** The basic design means fewer components compared to modern bikes, reducing the risk of complex mechanical failures. Parts are widely available, and repairs are often straightforward.

3. **Affordability** Purchasing a used 1988 YZ125 is significantly cheaper than buying a new or even a modern used dirt bike. This makes it an attractive option for beginners or those on a budget.

4. **Lightweight and Maneuverable** The 125cc engine keeps the bike lightweight, making it easy to handle, especially for younger riders or those new to motocross.

5. **Vintage Appeal** If you enjoy the nostalgia of older bikes, the YZ125 s retro design and mechanical simplicity can be appealing. It s a great choice for collectors or enthusiasts who appreciate classic machinery.

6. **Decent Performance for Its Time** The 1988 YZ125 was competitive in its era, offering a balance of power and agility. While it won t match modern bikes in raw speed, it s still capable for light trail riding or beginner motocross.

7. **Easy to Modify** The bike s simplicity allows for easy upgrades, such as swapping out the stock exhaust (like the one you mentioned) for better performance or sound. Aftermarket parts are available for tuning.

8. **Fuel Efficiency** A 125cc engine is inherently fuel-efficient, making it cost-effective to run compared to larger bikes.

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#### **Cons:**

1. **Outdated Technology** The bike lacks modern features like disc brakes (it likely has drum brakes), advanced suspension tuning, or electronic fuel injection. This can make it less safe and less comfortable for aggressive riding.

2. **Poor Fuel Economy Compared to Modern Standards** While still efficient for its class, a 1988 YZ125 will consume more fuel than a modern 125cc bike due to its carbureted setup and lack of fuel efficiency optimizations.

3. **Reliability Issues Over Time** Despite its durability, the bike may suffer from wear in critical areas like the clutch, chain, or engine seals after years of use. Rust can also be an issue if the bike was stored improperly.

4. **Limited Safety Features** Without modern safety features like ABS, better braking systems, or advanced suspension, the bike may not handle well in high-speed or technical terrain.

5. **Noise and Vibration** The air-cooled single-cylinder engine can be noisy and vibrate more than modern liquid-cooled engines. This can lead to discomfort during long rides.

6. **Parts and Service Challenges** While parts are available, finding a mechanic familiar with older Yamaha models may be difficult in some areas. You may need to source parts from specialty shops or online.

7. **Environmental Regulations** Some areas have emissions standards that may not accommodate older bikes, especially if you plan to ride on public trails. Check local laws before purchasing.

8. **Resale Value** Classic bikes like this one may not hold value well, and if you decide to sell later, you may not recover much of your initial investment.

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### **Conclusion:**

The 1988 Yamaha YZ125 is a solid choice if you re looking for a **budget-friendly, simple, and nostalgic** dirt bike for light riding, learning, or as a project bike. It s ideal for beginners, casual riders, or those who prioritize mechanical simplicity over modern performance. However, if you plan to ride aggressively, compete, or need a bike that meets current safety standards, a newer or more advanced model would be a better investment.

The **exhaust valve you mentioned (2VN-1131A-01-00)** is a stock or aftermarket part that could improve exhaust flow and performance, but ensure it s compatible with your bike s model year and engine condition. If the bike is in good mechanical shape otherwise, upgrading the exhaust could enhance its power and sound.

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### **Recommendation:** - **Buy it if:**

- You re on a tight budget and need a bike for basic riding or learning.

- You enjoy classic bikes and don t mind the trade-offs for nostalgia.

- You re willing to invest time in maintenance and potential upgrades.

- You plan to use it for light trail riding, practice, or as a backup bike.

- **Avoid it if:**

- You need a bike for serious motocross or high-performance riding.

- You prioritize modern safety features like disc brakes or advanced suspension.

- You want a bike that s easy to sell or trade in later.

- You re in an area with strict emissions regulations that may restrict older bikes.

**Final Suggestion:** Before purchasing, thoroughly inspect the bike for rust, engine condition, clutch wear, and chain health. Consider getting a pre-purchase inspection from a mechanic familiar with Yamaha singles. If you re serious about riding, pair this bike with basic safety gear (helmet, gloves, boots) and be prepared for more frequent maintenance than a modern bike.

Details:

THIS IS A USED OEM POWER VALVES ASSEMBLY FOR 1988 YAMAHA YZ 125.

part #: 2vn1131a0100 price

  • $299.99

specifications valvemotorcycleaz:

  • for models: Yz125, Yz, 125
  • for makes: Yamaha
  • for years: 1988
  • mpn: 2vn-1131a-01-00
  • type: Exhaust Valve
  • country of origin: Japan

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

shipping valvemotorcycleaz:

  • class: Standard
  • transit: 4-9 Days
  • type: Fixed
  • cost: $9.99
  • carrier: USPS
  • service: USPS Ground Advantage

seller valvemotorcycleaz:

  • city: Bradford, Ohio
  • # reviews: 6659
  • rating: 99.8%

general valvemotorcycleaz:

  • Engines Engine Parts > Valvetrain Components > Engine Valves
  • condition: Used

offer valvemotorcycleaz:

  • options: Ship-to-home
  • sold: 0
  • quantity: 1
  • started: April 25, 2026
  • availability: In Stock
for models: yz125, yz, 125, for makes: yamaha, for years: 1988, type: exhaust valve, country of origin: japan,
category: motorcycle parts > engines engine parts > valvetrain components > engine valves, sku: 8701855668109603,
Yamaha 2VN-1131A-01-00 Is Similar To:
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1 offer $299.99 USD
  • Used. Offer #1 priced at $299.99 + $9.99 shipping estimate = $309.98* total. THIS IS A USED OEM POWER VALVES ASSEMBLY FOR A 1988 YAMAHA YZ 125.+$9.99 shipping

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