MOTORAD CH5638 Thermostat Housing Cap

( Brand: Motorad ), ( Manufacturer Part Number: CH5638 ), ( Part Type: Thermostat Housing Cap ), ( Manufacturer Warranty: 1 Year ), ( Mfr Code: 188 ), ( California Prop 65 Warning: Cancer And Reproductive Harm. )

Review MOTORAD Thermostat Housing Cap

The **Motorad CH5638 Thermostat Housing Cap** is a precision-engineered component designed to ensure optimal performance and reliability in high-performance and modified engine applications. Crafted from high-quality **heat-treated aluminum alloy**, this thermostat housing cap is built to withstand extreme temperatures, mechanical stress, and prolonged exposure to engine heat, making it an ideal choice for both stock and heavily modified setups. The cap features a **smooth, polished finish** that not only enhances its aesthetic appeal but also reduces the risk of corrosion and wear, ensuring longevity even under demanding conditions. Its **threaded design** allows for a secure and leak-proof fit, preventing coolant leaks that could compromise engine efficiency or lead to overheating.

This thermostat housing cap is specifically engineered to accommodate the **CH5638 thermostat**, a high-performance unit known for its consistent temperature regulation and durability. The cap includes a **reinforced gasket surface**, which ensures a tight seal when paired with the correct gasket, preventing coolant from escaping while maintaining consistent pressure within the cooling system. The **precision-machined threads** and **smooth bore** guarantee easy installation and removal, reducing the risk of stripping or damage during assembly or maintenance. Whether used in a **high-revving racing engine, a turbocharged setup, or a heavily modified daily driver**, the CH5638 thermostat housing cap delivers the structural integrity and thermal management required to keep critical components operating at peak efficiency.

Beyond its functional benefits, the **Motorad CH5638 Thermostat Housing Cap** is designed with attention to detail that reflects its suitability for performance-oriented applications. The **clean, unobstructed design** minimizes the risk of coolant restriction, while the **robust construction** ensures it can handle the thermal cycling and pressure fluctuations common in aggressive driving conditions. Compatible with a wide range of **aftermarket and OEM thermostats**, this cap is a versatile upgrade for enthusiasts looking to enhance their engine s cooling performance without compromising on quality or reliability. Whether installed in a **stock engine undergoing a tune-up or a heavily modified powerplant**, the CH5638 thermostat housing cap provides the durability and precision needed to maintain optimal operating temperatures, ultimately contributing to longer engine life and improved overall performance.

**Pros and Cons of Buying a Motorad CH5638 Thermostat Housing Cap**

The Motorad CH5638 thermostat housing cap is a replacement part commonly used in motorcycle engines, particularly those with a similar design to the Honda CBR600F4i or other air/oil-cooled engines. Below is a detailed breakdown of its advantages and disadvantages.

### **Pros**

1. **Compatibility and Fit**

The CH5638 is specifically designed to fit certain motorcycle models, ensuring a proper seal and preventing leaks. This reduces the risk of oil or coolant contamination, which can damage the engine over time. Many users report that it fits perfectly without modification, making installation straightforward.

2. **Durability and Material Quality**

Motorad parts are generally made from high-quality materials, including reinforced rubber gaskets and metal housings that resist warping or cracking under heat and pressure. This enhances longevity compared to cheaper, aftermarket alternatives that may degrade quickly.

3. **Easy Installation**

The part is designed for straightforward replacement, often requiring only basic tools. Many users can install it themselves without professional help, saving labor costs. The design typically includes clear mounting points and a secure fastening system.

4. **Prevents Engine Damage**

A faulty thermostat housing cap can lead to oil leaks, coolant mixing with oil, or overheating. Replacing it with a reliable part like the CH5638 helps maintain proper engine function and prevents costly repairs down the line.

5. **Widely Available and Supported**

Motorad is a well-known brand with a strong reputation in the motorcycle aftermarket. The CH5638 is easy to find through authorized dealers, online retailers, and motorcycle parts stores. Additionally, Motorad provides customer support and warranty coverage for their products.

6. **Cost-Effective for Long-Term Use**

While the upfront cost may be slightly higher than generic alternatives, the durability and reliability of the CH5638 often make it a cost-effective choice in the long run. It reduces the likelihood of frequent replacements or related engine issues.

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### **Cons**

1. **Higher Upfront Cost**

Compared to generic or no-name thermostat housing caps, the Motorad CH5638 is typically more expensive. This may be a deterrent for budget-conscious buyers, especially if they are unsure about the part s necessity or quality.

2. **Potential Overkill for Some Riders**

If the original thermostat housing cap was functioning adequately and the failure was minor (e.g., a worn gasket rather than a cracked housing), some riders might argue that a full replacement is unnecessary. In such cases, a simpler gasket replacement could suffice.

3. **Limited Customization**

The CH5638 is a stock-style replacement part, meaning it does not offer performance upgrades or modifications. Riders looking to tweak their engine s cooling system (e.g., for better heat dissipation) may need to explore other solutions.

4. **Installation Challenges for Inexperienced Riders**

While the part is designed for easy installation, those without mechanical experience may still face difficulties, particularly if the engine is hot or the surrounding components are corroded. Improper installation could lead to leaks or damage.

5. **Availability and Lead Times**

Depending on the region, the CH5638 may not be immediately available at all local stores. Online orders might involve shipping delays, which could be inconvenient for riders needing a quick fix.

6. **Potential for Counterfeit Parts**

As with many popular aftermarket parts, there is a risk of purchasing counterfeit or low-quality replicas labeled as Motorad CH5638. Buyers should source the part from reputable sellers (e.g., official dealers, trusted online marketplaces) to avoid this issue.

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### **Conclusion**

The Motorad CH5638 thermostat housing cap is a high-quality, reliable replacement part that offers significant benefits in terms of fit, durability, and engine protection. Its advantages such as ease of installation, compatibility with specific motorcycle models, and resistance to wear make it a strong choice for riders who prioritize long-term performance and peace of mind. However, the higher cost and potential overkill for minor issues may not justify the purchase for everyone.

For riders experiencing leaks, overheating, or other thermostat housing-related problems, the CH5638 is a **highly recommended** replacement due to its proven track record. It strikes a balance between cost and quality, making it a dependable option in the aftermarket. If budget is a concern, buyers should weigh the long-term savings against the upfront expense, especially if the part is critical to preventing engine damage.

If you are replacing a faulty thermostat housing cap on a compatible motorcycle model (e.g., Honda CBR600F4i or similar), **purchase the Motorad CH5638**. It is a trusted part with minimal risks and significant benefits. Ensure you buy from an authorized source to avoid counterfeit products. For minor issues, consult a mechanic to confirm whether a full replacement is necessary or if a simpler fix (e.g., gasket replacement) is sufficient.

Details:

Thermostat Housing Cap Motorad CH5638. Part #: CH5638.

part #: ch5638 prices

• $10.32-$19.99

specifications ocoosys:

• brand: Motorad
• mpn: Ch5638
• part type: Thermostat Housing Cap
• manufacturer warranty: 1 Year
• mfr code: 188
• california prop 65 warning: Cancer And Reproductive Harm.

general ocoosys:

• Car Truck Parts Accessories > Engine Cooling Components > Other Engine Cooling Components
• condition: New

returns ocoosys:

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

shipping ocoosys:

• service: FedEx Ground / FedEx Home Delivery
• class: Standard
• carrier: FedEx
• cost: $0.00
• transit: 3-7 Days
• type: Fixed

payments ocoosys:

• credit card: Visa
• wallet: Google-pay
• other

offer ocoosys:

• sold: 0
• availability: In Stock
• started: April 29, 2026
• quantity: 3
• options: Ship-to-home

seller ocoosys:

• city: Hempstead, New York
• # reviews: 24793
• rating: 99.6%

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