YAMAHA 2HH-1131A-00-00 Cylinder Exhaust Power Valve Cap Bushings

( Manufacturer Part Number: 2HH-1131A-00-00 ), ( Part Type: Valve Cylinder Exhaust Cap Bushing )

Review YAMAHA Cylinder Exhaust Power Valve Cap Support Bushings fits YZ250 YZ 250 1986–1987

The **Yamaha 2HH-1131A-00-00** is a meticulously crafted, high-performance exhaust component designed exclusively for the **1987 and 1986 Yamaha YZ250** models, ensuring optimal power delivery and reliability for these iconic off-road bikes. This part represents the **power valve cap bushings** and **exhaust system components**, which play a critical role in maintaining the engine s efficiency, airflow, and overall performance. Engineered with Yamaha s signature precision, these bushings are crafted from durable, heat-resistant materials to withstand the intense thermal and mechanical stresses of high-revving two-stroke engines. The **power valve cap bushings** are specifically designed to provide a secure, leak-free seal between the exhaust manifold and the power valve assembly, preventing exhaust gas blowback while allowing unrestricted airflow essential for maximizing horsepower and torque in the YZ250 s aggressive racing applications. Whether used in competition or for enthusiasts seeking to restore stock performance, these components ensure a tight, reliable fit that minimizes wear and extends the lifespan of the exhaust system. The **1986-87 YZ250** was renowned for its aggressive handling and raw power, and these bushings are a vital part of preserving that legendary performance, offering a perfect balance between durability and performance. For riders who demand nothing less than factory-level reliability, the **2HH-1131A-00-00** is an essential replacement part, ensuring that every burst of throttle translates into clean, efficient power without compromising the integrity of the exhaust system.

### Pros and Cons of buying a Yamaha 2HH-1131A-00-00 (1987-88 YZ250) Exhaust Power Valve Cap and Bushings

1. **Performance Improvement** The power valve cap and bushings are designed to enhance airflow and throttle response, which can improve the engine s breathing and overall power output. This is particularly useful for older YZ250 models, which may have degraded performance over time due to wear.

2. **Restoration of Stock Feel** If the original parts were damaged or worn, replacing them can restore the stock riding characteristics, ensuring smoother operation and reducing vibrations.

3. **Prevents Further Damage** Worn bushings or a damaged power valve cap can lead to excessive play, misalignment, or even failure of the exhaust system. Replacing them proactively can prevent costly repairs down the line.

4. **Compatibility** These parts are specifically designed for the 1986-88 YZ250, ensuring a perfect fit without modification. No aftermarket adjustments are typically required.

5. **Cost-Effective Upgrade** Compared to more extensive engine modifications, replacing these components is relatively inexpensive and can yield noticeable improvements in performance and reliability.

6. **Ease of Installation** The parts are straightforward to install, especially for someone with basic mechanical experience. No specialized tools are usually needed beyond standard socket sets and possibly a torque wrench.

7. **Maintains Originality (If Desired)** If you prefer keeping the bike as close to stock as possible while still improving performance, these parts offer a subtle yet effective upgrade without drastic modifications.

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1. **Limited Performance Gain** While these parts can improve airflow and throttle response, the overall power increase may not be dramatic. For serious performance tuning, additional modifications (such as a new exhaust or carburetor upgrade) would likely be needed.

2. **Wear and Tear Over Time** Even with new parts, the bushings may eventually wear out again, especially if the bike sees heavy use or rough riding conditions. This could require future replacements.

3. **Potential for Misalignment** If not installed correctly, the power valve cap or bushings could become misaligned, leading to uneven exhaust flow or even damage to the exhaust system. Precision during installation is key.

4. **Availability and Sourcing** While these parts are relatively common for classic YZ250 models, sourcing them may require searching through specialty motorcycle parts dealers, online marketplaces, or salvage yards. Prices can vary, and authenticity may be a concern if buying from third-party sellers.

5. **No Guarantee of Stock Feel** If the original parts were already worn or damaged, replacing them may not fully restore the stock riding feel. Some riders may notice slight differences in handling or exhaust note.

6. **Time-Consuming for Beginners** While the installation is manageable, those without mechanical experience may find it challenging, especially if they lack access to proper tools or documentation.

7. **Potential for Counterfeit Parts** If purchasing from an unverified source, there is a risk of receiving low-quality or counterfeit parts that do not perform as expected. Always buy from reputable sellers with return policies.

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The Yamaha 2HH-1131A-00-00 exhaust power valve cap and bushings are a **worthwhile upgrade** for the 1986-88 YZ250, particularly if you re looking to restore stock performance, improve throttle response, or prevent further wear in the exhaust system. The benefits such as better airflow, reliability, and ease of installation outweigh the minor drawbacks for most riders, especially those who prioritize maintaining or enhancing the bike s original character.

However, if you re seeking **significant power gains**, these parts alone may not be sufficient, and additional modifications (e.g., a new exhaust, carburetor, or camshaft) would likely be necessary. For casual riders or those restoring a classic bike, this upgrade is a **smart, low-risk investment** that can extend the life of your YZ250 and improve its daily drivability.

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- You re experiencing degraded performance or unusual exhaust noises in your YZ250.

- You want to restore the bike to closer-to-stock condition.

- You re looking for a simple, cost-effective way to improve throttle response and airflow.

- You have basic mechanical skills or access to someone who can assist with installation.

- You re seeking dramatic power increases (consider a full exhaust system or carburetor upgrade instead).

- You re unsure about installing them yourself and lack access to a mechanic.

- You re buying from an unverified source without warranties or return options.

**Final Verdict:** For the average rider, these parts are a **solid, practical upgrade** that offers tangible benefits without major drawbacks. Pair this with regular maintenance, and your YZ250 will likely run smoother and more reliably for years to come.

Details:

They are packaged as they removed. These are used parts unless explicitly mentioned above. Good used condition no damage ready to install. Do not expect seals and bearings to be perfect some or all may need replaced.

Sold as is, picture. This part was removed off a 1987 Yamaha Yz250. Expect dirt, dust, oil, grease, rust, dents, scratches, sun fade, etc on all parts.

part #: 2hh1131a0000 prices

• $199.99-$449.99

specifications cyclevintagee:

• for models: Yz250, Yz, 250
• for makes: Yamaha
• for years: 1986-1987
• mpn: 2hh-1131a-00-00
• part type: Valve Cylinder Exhaust Cap Bushing

seller cyclevintagee:

• city: Cygnet, Ohio
• # reviews: 570
• rating: 99.0%

general cyclevintagee:

• condition: Used
• Parts Accessories > Motorcycle Scooter Parts Accessories > Other Motorcycle Scooter Parts Accessories

payments cyclevintagee:

• other
• wallet: Paypal
• credit card: Diners-club

shipping cyclevintagee:

• carrier: USPS
• transit: 5-11 Days
• type: Calculated
• cost: $0.00
• class: Standard
• service: USPS Ground Advantage

returns cyclevintagee:

• policy: No Returns

offer cyclevintagee:

• availability: In Stock
• started: March 19, 2026
• sold: 0
• quantity: 1
• options: Ship-to-home
• best offers: True

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