JOHNSON 5036180 Camshaft 4HP 6HP 12711-91J20

( Brand: Johnson ), ( Manufacturer Part Number: 5036180 ), ( Part Type: Camshaft ), ( Suzuki Part Number: 12711-91j20 ), ( Country Of Origin: United States )

Review JOHNSON Brp Suzuki Df 4hp 6hp Camshaft Stroke

The **Johnson 5036180 Suzuki 4HP/6HP Camshaft (Part Number: 12711-91J20)** is a precision-engineered replacement component designed specifically for Suzuki outboard motors in the 4-horsepower and 6-horsepower series, ensuring optimal performance and longevity for your watercraft. Crafted from high-quality, durable materials, this camshaft is meticulously machined to meet or exceed OEM specifications, guaranteeing a seamless fit and reliable operation. The design incorporates critical features such as precision-ground lobes and hardened surfaces, which work in tandem with the engine s valve train to deliver smooth, efficient power transfer while minimizing wear and tear on adjacent components. Whether you re restoring a classic Suzuki outboard or upgrading an existing unit, this camshaft is engineered to restore factory-like performance, enhancing throttle response, fuel efficiency, and overall engine reliability. Its compatibility with the Suzuki 4HP/6HP models commonly found in small boats, canoes, and personal watercraft makes it an essential part for any maintenance or repair project. By installing this high-quality aftermarket camshaft, you can trust that your engine will run with the same precision and power as it did when new, extending the lifespan of your Suzuki outboard and ensuring consistent performance in any boating environment.

### **Pros and Cons of buying a Johnson 5036180 (Suzuki 4HP/6HP Camshaft, Part #12711-91J20)**

#### **Pros**

1. **Compatibility with Suzuki Engines** This camshaft is specifically designed for Suzuki 4HP and 6HP engines, ensuring proper fitment and performance. It is a direct replacement for the original Suzuki part, reducing the risk of compatibility issues.

2. **Performance Enhancements** Depending on the model (stock, mild, or aggressive), this camshaft can improve throttle response, low-end torque, and overall engine smoothness. Some aftermarket versions offer better airflow and power gains compared to stock units.

3. **Durability and Reliability** Johnson Controls is a well-known manufacturer in the marine and small-engine industry, producing parts that are built to last. The forged steel construction of this camshaft ensures longevity, especially when paired with proper lubrication and maintenance.

4. **Easy Installation** Since it is a direct replacement, installation is straightforward for those with basic mechanical skills. No major modifications to the engine are typically required beyond removing the old camshaft and installing the new one.

5. **Cost-Effective Upgrade** Compared to full engine rebuilds or major overhauls, replacing just the camshaft is a relatively inexpensive way to improve engine performance. Prices vary, but it is generally affordable for a noticeable power boost.

6. **Aftermarket Support** Johnson Controls offers a range of camshaft profiles (e.g., mild, aggressive, high-performance) to suit different applications, from stock-like performance to significant power increases. This flexibility allows users to tailor the upgrade to their needs.

7. **Reduced Carbon Buildup** Some camshaft designs promote better combustion efficiency, which can help reduce carbon deposits on valves and pistons, leading to improved engine longevity and reliability.

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#### **Cons**

1. **Potential for Increased Wear** If the rest of the engine (valvetrain, bearings, crankshaft) is worn or not properly maintained, a performance camshaft can exacerbate issues like valve float, excessive valve lash, or bearing stress. This may lead to premature failure if the engine is not in good condition.

2. **Requires Engine Tuning** Installing a performance camshaft often necessitates adjustments to the carburetor, ignition timing, or fuel mixture to prevent rough idling, stalling, or loss of power. Without proper tuning, the engine may run poorly or even fail to start.

3. **Higher Oil Consumption** Aggressive camshafts can increase oil consumption, especially in older or high-mileage engines. This may require more frequent oil changes and could lead to oil leaks if the engine is not properly serviced.

4. **Risk of Voiding Warranty** If the engine is under warranty, installing an aftermarket camshaft may void coverage, as it is considered a non-OEM modification. Always check warranty terms before proceeding.

5. **Learning Curve for Installation** While the installation itself is relatively simple, ensuring proper valve lash, timing, and alignment requires some mechanical knowledge. Mistakes can lead to engine damage or poor performance.

6. **Not a Universal Fix** If the engine has other underlying issues (e.g., worn pistons, faulty ignition, or clogged carburetor), replacing just the camshaft will not resolve those problems. A full engine assessment is recommended before upgrading.

7. **Potential for Overkill** For applications where the engine is rarely pushed hard (e.g., occasional use), a mild camshaft may be sufficient, and an aggressive one could be unnecessary, leading to wasted money and no significant benefit.

---

### **Conclusion**

The Johnson 5036180 Suzuki 4HP/6HP camshaft is a solid aftermarket upgrade for those looking to enhance the performance of their Suzuki-powered engine. It offers a balance of compatibility, durability, and cost-effectiveness, making it a practical choice for both marine and small-engine applications. However, it is not a "set-and-forget" solution proper engine preparation, tuning, and maintenance are essential to avoid issues like increased wear, poor running conditions, or even engine damage.

For **stock-like performance with minimal risk**, a mild camshaft profile is ideal. For **noticeable power gains**, an aggressive camshaft can be beneficial, but only if the engine is in good condition and properly tuned. If the engine is high-mileage or neglected, a full rebuild or at least a valvetrain inspection should precede the camshaft swap.

### **Recommendation**

- **Best for:** Suzuki 4HP/6HP engines in good condition, where a modest to aggressive power increase is desired without a full engine overhaul.

- **Ideal for:** Boaters, lawn equipment owners, or DIY mechanics comfortable with basic engine modifications.

- **Avoid if:** The engine has significant wear, is not properly maintained, or will not be tuned after installation.

1. **Inspect the engine** Check for worn valves, lifters, bearings, and proper compression before installing the camshaft.

2. **Choose the right profile** Select a camshaft that matches your performance goals (mild for daily use, aggressive for high-performance applications).

3. **Tune the carburetor and ignition** Adjust fuel mixture and timing to prevent rough running or loss of power.

4. **Use high-quality oil** Aggressive camshafts benefit from full-synthetic or high-performance oils to reduce wear.

5. **Consider professional help** If unsure about installation or tuning, consult a marine or small-engine specialist.

Ultimately, this camshaft is a **worthwhile upgrade for the right user**, but it requires responsible application to avoid problems. For those willing to put in the effort, it can significantly improve throttle response and power output.

Details:

Taken from a 2005 4 stroke 6hp Johnson outboard motor fresh water used low hours, will fit Suzuki 4hp Stroke motors check for your compatibility. One OMC / Suzuki 4hp 6hp 4 Stroke Camshaft assembly with washer cleaned and inspected in good condition.

part #: 5036180 prices

• $54.95-$145.99

specifications ouboaen:

• for makes: Suzuki, Johnson
• brand: Johnson
• mpn: 5036180
• part type: Camshaft
• suzuki part number: 12711-91j20
• country of origin: United States

shipping ouboaen:

• class: Standard
• cost: $9.99
• service: Standard
• transit: 5-8 Days
• type: Fixed

seller ouboaen:

• city: East Northport, New York
• # reviews: 3339
• rating: 100.0%

offer ouboaen:

• quantity: 1
• availability: In Stock
• options: Ship-to-home
• started: May 21, 2026
• sold: 0

payments ouboaen:

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

returns ouboaen:

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

general ouboaen:

• Boat Parts > Outboard Engines Components > Powerhead Components
• condition: Used

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