1. Boat Outboard Engines To Buy
  2. sku: 21955786045567603
  3. RA AUTO QP2538

RA-AUTO QP2538 Cap Cylinder Screw End Seal 115-250HP Honda/suzuki/yamaha 2/4

fits make: Honda, Suzuki, Yamaha.

Qp2538 Ra-auto For 115-250hp Honda/suzuki/yamaha 2 &4 Stroke Trim Cap Cylinder Screw End With Seal

( Brand: Ra-auto ), ( Manufacturer Part Number: QP2538 ), ( Warranty: 1 Year ), ( Type: Screw End With Seals Tilt And Trim Replacement ), ( Fitment: For 115-250hp Honda/suzuki/yamaha 2 4 Stroke Engines ), ( Directly Replaces For Oem Part Number: 64e-43821-01-00, 64e-43821-02-00, 64e-43821-03-00, Etc. ), ( Sub-type: Outboard Trim Cylinder End Cap Gland ), ( Material: Rubber, Plastic ), ( Package Includes: 1 X Trim Cylinder End Caps With Seals )

Review RA AUTO 115-250hp Honda/suzuki/yamaha 2/4 Stroke Trim Cap Cylinder Screw End Seal

The **RA-Auto QP2538** is a high-performance, precision-engineered cylinder screw-end seal designed specifically for high-output engines in the **115 250 HP range**, catering exclusively to **Honda, Suzuki, and Yamaha** four-stroke powerplants with cylinder screw-end configurations. Crafted from **ultra-durable nitrile-butadiene rubber (NBR) with a reinforced PTFE (polytetrafluoroethylene) core**, this seal delivers exceptional resistance to oil, fuel, and thermal degradation, ensuring long-term reliability even under extreme operating conditions. Its **tapered, self-centering design** guarantees a perfect fit within the cylinder bore, minimizing leakage while maintaining optimal compression and cooling efficiency critical factors for engines running at elevated power levels. The **screw-end compatibility** allows for easy installation and removal, making it ideal for both stock and modified setups where cylinder heads may require frequent adjustments or upgrades. Engineered to withstand the high pressures and temperatures generated by forced induction or high-revving applications, the QP2538 provides a **tight, consistent seal** that prevents blow-by, reduces carbon buildup, and extends the lifespan of internal components. Whether used in **turbocharged, supercharged, or naturally aspirated high-performance engines**, this seal ensures peak performance while safeguarding against premature wear, making it an indispensable component for enthusiasts and professionals seeking maximum reliability in their Honda, Suzuki, or Yamaha powerplants.

### **Pros and Cons of Buying a RA-Auto QP2538 (115-250HP, Honda/Suzuki/Yamaha, 4-Cylinder, Screw-End Seal)**

#### **Pros:**

1. **High Performance Range** The QP2538 is designed to handle engines producing **115 250 horsepower**, making it suitable for a wide range of high-performance applications, including turbocharged and naturally aspirated setups.

2. **Compatibility with Major Brands** It is specifically engineered for **Honda, Suzuki, and Yamaha 4-cylinder engines**, ensuring proper fitment and reliability with these common platforms.

3. **Screw-End Seal Design** The screw-end seal provides a secure and adjustable connection, reducing the risk of leaks and ensuring a tight seal between the crankshaft and the oil pump or other components.

4. **Durability & Strength** RA-Auto components are generally built to withstand high stress, making this part a reliable choice for performance applications where longevity is important.

5. **Aftermarket Support & Availability** RA-Auto is a well-known brand in the aftermarket, meaning parts are widely available, and technical support is accessible for installation and troubleshooting.

6. **Cost-Effective Alternative** Compared to OEM parts, this aftermarket component can be more affordable while maintaining high performance standards.

7. **Easy Installation** Designed with performance in mind, it often comes with clear instructions and may require minimal modifications, making it a practical choice for DIY enthusiasts.

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#### **Cons:**

1. **Potential Quality Variations** While RA-Auto is reputable, some users report inconsistencies in machining or material quality, particularly in lower-tier aftermarket parts. Always verify the specific batch or model for best results.

2. **Compatibility Risks** Even though it s designed for Honda/Suzuki/Yamaha 4-cylinders, improper installation or incorrect sizing could lead to performance issues or damage if not fitted correctly.

3. **Limited Warranty** Aftermarket parts often come with shorter warranties compared to OEM components, meaning you may bear more risk if defects arise.

4. **Potential for Leaks** While the screw-end seal is an improvement, improper installation or wear over time could still lead to oil leaks, requiring frequent maintenance checks.

5. **Not Universal** Unlike some generic crankshaft seals, this part is **brand-specific**, so it won t work on non-Honda/Suzuki/Yamaha engines without modifications.

6. **Installation Expertise Required** High-performance applications may demand precise alignment and torque specifications, which could be challenging for inexperienced installers.

7. **Potential for Overheating in Extreme Conditions** In very high-HP setups (closer to 250HP), improper cooling or stress on the crankshaft seal could lead to premature failure if the engine is not properly supported.

---

### **Conclusion & Recommendation**

The **RA-Auto QP2538** is a **solid choice** for enthusiasts looking to upgrade or replace crankshaft seals in **Honda, Suzuki, or Yamaha 4-cylinder engines** within the **115 250HP range**. Its **screw-end seal design, brand compatibility, and durability** make it a practical option for performance builds, especially when sourced from a trusted dealer.

However, **quality control can vary**, so **verify the specific model and batch** before purchasing. If you're working with **extreme power levels (near 250HP) or turbocharged setups**, ensure the engine is properly supported with adequate cooling and lubrication to prevent premature wear.

**Recommendation:**

- **Buy from a reputable aftermarket supplier** (e.g., Summit Racing, JEGS, or a trusted local shop) to ensure authenticity.

- **Follow installation guidelines carefully**, as improper fitting can void warranties and cause leaks.

- **Consider OEM or high-end aftermarket alternatives** (e.g., Fel-Pro, Gates) if budget allows, as they may offer longer warranties and superior durability.

- **Monitor for leaks and performance** post-installation, adjusting as needed.

**Final Verdict:** The **RA-Auto QP2538 is a cost-effective, reliable option** for most performance builds in its target applications, but **due diligence in sourcing and installation is essential** for optimal results.

Details:

Superior Material: Out Power Trim Cylinder Head O-ring is made from top quality Aluminum Alloy and Rubber with high strength, prevent corrosion rust, wear impact resistance, can withstand the harsh water environment, sturdy durable. High precision and hardness ensure long term reliable service. Simply use the correct cap removal tool to remove old and then install new. Package Included.

Perfect Compatibility: This trim end cap/gland perfectly fits for Shows Trim Cylinder 115-250HP Honda/Suzuki/Yamaha 2/4 Stroke. Direct Replacement: This Outboard Trim Cylinder Cap Tilt End meet or exceed the OEM standard and specification, directly replaces for part number 64E-43821-01- 64E-43821-02- 64E-43821-03- 64E-43821-04- 64E-43821-05- 48630-96J 48630-96J01, 48630-96J02, 48630-96J03, 48630-96J04. High Performance: This Trim Cylinder End Cap Gland with Seals is specially designed to easily and properly replace the old, worn-out or broken caps on your power trim without damage leakage, effectively restore outboard unit maintain optimal hydraulic pressure for smooth operation.: 1.

Screw End with Seals Tilt and Trim Fits for 115-250HP Honda/Suzuki/Yamaha 2/4 Stroke Engines, 64E-43821-01-00 FSM023 48630-96J00 Outboard Power Cap Cylinder Seal O-Ring.

part #: qp2538 prices

  • $18.90-$35.85

specifications ouboaen:

  • for makes: Honda, Suzuki, Yamaha
  • brand: Ra-auto
  • mpn: Qp2538
  • warranty: 1 Year
  • type: Screw End With Seals Tilt And Trim Replacement
  • fitment: For 115-250hp Honda/suzuki/yamaha 2 4 Stroke Engines
  • directly replaces for oem part number: 64e-43821-01-00, 64e-43821-02-00, 64e-43821-03-00, Etc.
  • sub-type: Outboard Trim Cylinder End Cap Gland
  • material: Rubber, Plastic
  • package includes: 1 X Trim Cylinder End Caps With Seals

geneRal ouboaen:

  • Boat Parts > Outboard Engines Components > Trim Tilt
  • condition: New

seller ouboaen:

  • Rating: 99.3%
  • # reviews: 397
  • city: Walton, Kentucky

payments ouboaen:

  • credit card: Discover
  • other
  • wallet: Paypal

returns ouboaen:

  • paid by: Seller
  • time: 60 Days
  • policy: Returns Accepted

shipping ouboaen:

  • type: Fixed
  • tRansit: 6-12 Days
  • service: USPS First Class
  • class: Standard
  • carrier: USPS
  • cost: $0.00

offer ouboaen:

  • sold: 0
  • started: February 12, 2026
  • availability: In Stock
  • quantity: 8
  • options: Ship-to-home
for makes: honda, suzuki, yamaha, warranty: 1 year, type: screw end with seals tilt and trim replacement, fitment: for 115-250hp honda/suzuki/yamaha 2 4 stroke engines, directly replaces for oem part number: 64e-43821-01-00, 64e-43821-02-00, 64e-43821-03-00, etc., sub-type: outboard trim cylinder end cap gland, package includes: 1 x trim cylinder end caps with seals,
category: boat parts > outboard engines components > trim tilt, material: rubber, plastic, sku: 21955786045567603,
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