1. Boat Outboard Engines To Buy
  2. sku: 23837709538772813
  3. TOHATSU 3R4070100

TOHATSU 3R4070100 Cam Shaft

fits year: 2005–2016.

3r4070100 Tohatsu 6 Hp 4 Stroke Cam Shaft Assembly Pn Fits 2005-2016

( Brand: Tohatsu ), ( Manufacturer Part Number: 3R4070100 ), ( Part Type: Hp Cam Shaft ), ( Country Of Origin: Japan )

Review TOHATSU Hp Stroke Cam Shaft Assembly Pn fits 2005–2016

The **Tohatsu 3R4070100 HP Camshaft** is a precision-engineered component designed exclusively for Tohatsu outboard motors manufactured between the model years **2005 and 2016**, specifically for the **3R series** (including models like the 3R40, 3R50, and 3R60). Crafted from high-grade forged steel, this camshaft is built to deliver optimal performance, durability, and reliability under the demanding conditions of marine applications. Engineered with a **high-lift, high-duration profile**, it enhances combustion efficiency, ensuring smoother power delivery, improved throttle response, and reduced emissions key factors for maintaining peak performance in both recreational and professional boating scenarios. The camshaft s **precision-ground lobes** and **optimized timing** work in tandem with the engine s valve train to maximize airflow, which translates to better fuel economy and extended engine life. Whether used in a high-performance cruiser, a fishing vessel, or a workboat, this camshaft is designed to withstand the rigors of saltwater corrosion, thermal stress, and continuous operation, making it a critical upgrade for owners seeking enhanced power and longevity. Its compatibility with the **3R4070100 engine series** ensures a seamless fit, allowing for easy installation without the need for additional modifications, while its robust construction minimizes wear and tear on related components like lifters, valves, and timing belts. For those looking to restore stock performance or push their outboard to new limits, the **Tohatsu 3R4070100 HP Camshaft** is an indispensable part that bridges the gap between standard performance and high-performance reliability.

### **Pros and Cons of Buying a Tohatsu 3R4070100 HP Camshaft (2005 2016 Models)**

#### **Pros:**

1. **Compatibility** The 3R4070100 camshaft is designed specifically for Tohatsu marine engines, particularly the **3R4070 series (70 HP)**, which powers outboard motors from 2005 to 2016. This ensures a direct fit without modification, reducing the risk of installation errors.

2. **Performance Enhancement** A high-quality camshaft can improve engine efficiency, throttle response, and power output. If the original camshaft is worn or outdated, replacing it with a **performance-tuned version** (such as an aftermarket HP cam) may restore or even boost horsepower and torque.

3. **Durability & Longevity** Tohatsu engines are known for reliability, and OEM or high-quality aftermarket camshafts are built to last. If properly maintained, a well-chosen camshaft can extend the engine s lifespan by reducing excessive wear on valves, pistons, and other components.

4. **Easier Maintenance** Since the camshaft is a critical internal component, replacing it as part of routine maintenance (e.g., during an overhaul) can prevent catastrophic failure. Some owners opt for upgrades to avoid future issues with timing or valve train wear.

5. **Aftermarket Support** Tohatsu s 3R series has a dedicated aftermarket community, meaning you ll find replacement parts, tuning guides, and technical support more easily than with less common marine engines.

6. **Potential for Tuning** If you plan to modify the engine (e.g., with a performance kit, upgraded fuel system, or turbocharging), a **high-performance camshaft** can help optimize airflow and combustion, making tuning more effective.

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#### **Cons:**

1. **Cost** A **new OEM or high-quality aftermarket camshaft** (especially an HP version) can be expensive, often ranging from **$100 $300 **, depending on the brand and modifications. If the engine is older, the cost may not justify the upgrade unless performance gains are significant.

2. **Installation Complexity** Replacing a camshaft requires **disassembling the engine**, which is a labor-intensive process. Unless you have mechanical experience, this job is best left to a professional marine mechanic, adding to the overall cost.

3. **Potential for Over-Tuning** If you install an **aggressive camshaft** without adjusting other components (e.g., fuel system, ignition timing, or exhaust), it can lead to **poor idle, rough running, or even engine damage** due to excessive valve lift or duration.

4. **Warranty & Voiding** If your engine is still under warranty, modifying it with an aftermarket camshaft may **void coverage**. Always check Tohatsu s warranty terms before proceeding.

5. **Limited Performance Gains in Stock Engines** If the engine is already running well with stock components, the performance improvement from a camshaft upgrade may be **marginal**. Significant gains typically require complementary modifications (e.g., upgraded intake/exhaust, fuel injection tuning).

6. **Risk of Counterfeit Parts** Buying from untrusted sellers increases the chance of receiving **fake or low-quality camshafts**, which can fail prematurely and cause engine damage. Stick to **reputable brands** (e.g., Tohatsu OEM, **Marine Parts Express, Sea-Doo Performance, or trusted aftermarket suppliers**).

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### **Conclusion**

The **Tohatsu 3R4070100 HP camshaft** is a **valuable upgrade** for owners looking to **restore performance, improve reliability, or prepare their engine for tuning**. However, the decision depends on your **budget, mechanical skill level, and long-term goals** for the engine.

- **If you need a direct replacement** (due to wear or failure) and want **reliable OEM performance**, a standard Tohatsu camshaft is a safe choice.

- **If you want performance gains**, an **aftermarket HP camshaft** (from a trusted brand) can be beneficial, but it should be paired with **proper tuning and supporting modifications**.

- **If the engine is older and not heavily modified**, the cost of replacement may not be justified unless you re experiencing **specific performance issues**.

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### **Recommendation**

1. **Assess Engine Condition First** Before buying a new camshaft, ensure the engine is in good shape. Check for **valve train wear, timing belt condition, and cylinder compression**. If other components are failing, address them first.

2. **Choose the Right Camshaft**

- **Stock Replacement:** If you just need a **direct OEM replacement**, buy from **Tohatsu or an authorized dealer**.

- **Performance Upgrade:** If tuning, select a **reputable aftermarket HP cam** (e.g., **Sea-Doo Performance, Marine Parts Express, or Tohatsu-approved upgrades**). Avoid overly aggressive cams unless you re experienced.

3. **Get Professional Installation** Unless you re a skilled mechanic, **have a marine engine specialist** perform the replacement to avoid misalignment or damage.

4. **Tune the Engine Properly** If upgrading, **adjust fuel delivery, ignition timing, and air-fuel mixture** to match the new camshaft s characteristics. Poor tuning can negate benefits or cause damage.

5. **Consider Alternatives** If budget is a concern, check for **used or remanufactured camshafts** from trusted sources, though quality may vary.

**Final Verdict:**

- **Worth it?** **Yes, if** you have a **specific need** (replacement or performance gain) and are prepared for the **cost and installation effort**.

- **Not worth it?** If the engine is **already running well** and you re on a tight budget, prioritize other maintenance tasks first.

For most **2005 2016 Tohatsu 3R4070 owners**, a **high-quality camshaft upgrade is a smart investment** if done correctly just ensure it aligns with your engine s overall condition and tuning goals.

Details:

Good condition, no rust.

part #: 3r4070100 prices

  • $44.95-$52.00

specifications ouboaen:

  • for years: 2005-2016
  • brand: Tohatsu
  • mpn: 3r4070100
  • part type: Hp Cam Shaft
  • country of origin: Japan

shipping ouboaen:

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

returns ouboaen:

  • policy: No Returns

payments ouboaen:

  • money order
  • other
  • credit card: Discover
  • wallet: Paypal

general ouboaen:

  • Boat Parts > Outboard Engines Components > Mid-Sections
  • condition: Used

seller ouboaen:

  • # reviews: 138
  • rating: 100.0%
  • city: New Milford, New Jersey

offer ouboaen:

  • options: Ship-to-home
  • quantity: 1
  • sold: 0
  • started: May 9, 2026
  • availability: In Stock
for years: 2005-2016, part type: hp cam shaft, country of origin: japan,
category: boat parts > outboard engines components > mid-sections, sku: 23837709538772813,
Tohatsu 3R4070100 Is Similar To:
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3 offers $44.95–$52.00 USD
  • Used. Offer #1 priced at $44.95 + $0.00 shipping estimate = $44.95* total. Good condition, no rust.FREE SHIPPING
  • Used. Offer #2 priced at $45.50 + $0.00 shipping estimate = $45.50* total. Tohatsu 6 HP 4 Stroke Four Stroke Cam Shaft Assembly. PN .FREE SHIPPING
  • Used. Offer #3 priced at $52.00 + $0.00 shipping estimate = $52.00* total. FREE SHIPPING

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