SUZUKI 12711-45111 Camshaft Cams Intake Exhaust

( Manufacturer Part Number: 12711-45111 ), ( Part Type: Intake Camshaft Cam Exhaust )

Review SUZUKI 850camshaft Cams Intake Exhaust fits GS 850 1979–1982

The **Suzuki 12711-45111 camshaft kit** for the **1979 1982 GS850** is a meticulously engineered aftermarket upgrade designed to unlock the full potential of this legendary air-cooled, fuel-injected motorcycle. This high-performance set includes a pair of **precision-machined cams** one for the intake and one for the exhaust crafted to refine the GS850 s already impressive 847cc air-cooled engine, which was already a standout in its class. The intake cam features a slightly longer duration and more aggressive lift profile, allowing for improved airflow into the combustion chamber, which enhances throttle response, mid-range torque, and overall engine breathing. Meanwhile, the exhaust cam is optimized to maximize scavenging efficiency, ensuring that spent gases exit the cylinder more effectively, reducing backpressure and further boosting power delivery. Together, these cams create a balanced powerband that smooths out the GS850 s naturally peppy yet slightly uneven character, delivering a more linear and engaging ride from low-end torque to high-revving top-end punch. Whether you're cruising on the open road or pushing the limits on a twisty backroad, this kit transforms the GS850 into a more refined, responsive, and exhilarating machine. Built to Suzuki s original specifications with aftermarket precision, these cams are a seamless bolt-on solution that requires no major modifications to the engine, making them an ideal choice for enthusiasts who want to enhance performance without extensive rebuilds. Perfect for both street riding and light track use, this camshaft upgrade is a must-have for anyone looking to breathe new life into their classic GS850 while preserving its timeless character.

### **Pros and Cons of Buying a 1979 1982 Suzuki GS850 with the 12711-45111 Camshaft Set (Intake/Exhaust Cams)**

#### **Pros**

1. **Performance Gains**

The 12711-45111 camshaft set is designed to improve throttle response, especially at higher RPMs, by increasing valve lift and duration. This makes the GS850 more engaging in both street and track applications. The intake cams open earlier, allowing better airflow into the cylinders, while the exhaust cams help with scavenging, reducing backpressure and improving exhaust flow.

2. **Compatibility and Availability**

Suzuki s GS850 is a well-documented bike, and the 12711-45111 camshaft set is an aftermarket part that has been widely used and tested by enthusiasts. It is relatively easy to source from reputable suppliers, and installation is straightforward for those with basic mechanical skills or access to a mechanic.

3. **Cost-Effective Modification**

Compared to more aggressive camshaft kits or engine swaps, this cam upgrade is a relatively inexpensive way to enhance performance. It avoids the complexity and cost of a full engine rebuild or cylinder head work, making it an attractive option for riders who want noticeable improvements without a major investment.

4. **Maintains Stock Reliability**

The GS850 is already a robust, reliable engine, and the stock camshafts are durable. The 12711-45111 set is designed to work within the engine s limits, reducing the risk of catastrophic failure if installed correctly. It does not require significant modifications to the engine s supporting components (like valves or springs) unless the bike is heavily modified elsewhere.

5. **Improved Driving Experience**

For riders who find the stock GS850 s power delivery too sluggish, especially in mid-range RPMs, this cam upgrade can make the bike feel more responsive and fun to ride. The increased airflow and better valve timing can translate to smoother power delivery and a more engaging ride quality.

6. **Track and Touring Versatility**

While the GS850 is not a high-revving sportbike, the cam upgrade can make it more suitable for light track use or spirited touring. The improved exhaust flow also contributes to a more aggressive exhaust note, which some riders appreciate.

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#### **Cons**

1. **Requires Tuning for Optimal Performance**

Simply installing the camshaft set without adjusting the carburetors (or fuel injection, if upgraded) will not yield the best results. The GS850 s carburetors (typically Mikuni or Dell Orto) may need richer mixtures or adjustments to compensate for the increased airflow. Without proper tuning, you risk running lean, which can cause overheating, poor power delivery, or even engine damage. Some riders opt for a power valve or aftermarket carburetors (like Keihin) to match the cam upgrade.

2. **Potential for Rough Idling or Throttle Hesitation**

The 12711-45111 cams are more aggressive than stock, which can lead to rough idling or hesitation at low RPMs if the engine is not properly warmed up or if the carburetors are not adjusted correctly. This is more noticeable in stop-and-go traffic or at traffic light revs.

3. **Increased Engine Stress**

While the camshaft set itself is not overly aggressive, the combination of higher airflow and valve lift can increase stress on the engine s internals, particularly the valves, valve springs, and rocker arms. If the bike is already running with worn components (e.g., valves, springs, or timing chain), the upgrade could exacerbate issues. Regular maintenance and inspection are essential.

4. **Limited Power Gains Without Supporting Mods**

The GS850 s stock engine is not designed for high-performance camshafts, and the gains will be modest unless other modifications are made. For example:

- **Exhaust System:** A high-flow exhaust can help realize the full potential of the cam upgrade by reducing backpressure.

- **Air Intake:** A high-flow air filter or aftermarket intake can improve airflow into the engine.

- **Ignition Timing:** Advancing the ignition timing can help optimize combustion with the new cams.

Without these, the power gains will be subtle, and the bike may still feel underpowered compared to modern standards.

5. **Potential for Increased Oil Consumption**

Aggressive cams can sometimes lead to increased oil consumption, especially if the piston rings or valve seals are worn. This is not a guarantee but something to monitor, particularly if the bike is older or has high mileage.

6. **Installation Complexity**

While not overly difficult, installing camshafts requires removing the cylinder head, which involves disconnecting the carburetors, exhaust, and other components. It also requires precise valve lash adjustments and potentially valve grinding if the valves are not perfectly aligned. Mistakes during installation (e.g., incorrect lash settings or bent valves) can lead to engine damage.

7. **Resale Value Impact**

The GS850 is already a niche bike, and aftermarket modifications like camshaft upgrades can deter some buyers who prefer stock or lightly modified bikes. While performance enthusiasts may appreciate the upgrade, it may not appeal to those looking for a "clean" classic.

---

### **Conclusion**

The **12711-45111 camshaft set for the 1979 1982 Suzuki GS850** is a worthwhile upgrade for riders seeking improved throttle response, better mid-range power, and a more engaging ride. It is a cost-effective way to enhance performance without a full engine rebuild, and the parts are widely available. However, it is not a "set-and-forget" modification it requires proper carburetor tuning, potential supporting mods (exhaust, intake, ignition), and careful installation to avoid issues like rough idling or engine stress.

For **street riders** who want a more lively GS850 without extreme modifications, this cam upgrade is a solid choice. For **track or performance-focused riders**, it should be paired with other upgrades (like a high-flow exhaust or carburetors) to fully realize its potential. Riders with **high-mileage or worn engines** should ensure the internals are in good condition before installing aggressive cams.

If you are comfortable with basic mechanical work or have access to a mechanic, this is a **recommended upgrade** for those who want to breathe new life into their GS850. However, if you are not willing to invest time in tuning and maintenance, the gains may be underwhelming.

### **Final Recommendation**

- You want a noticeable improvement in throttle response and mid-range power.

- You are prepared to tune the carburetors or adjust the fuel mixture.

- You plan to pair it with other mods (exhaust, intake) for better results.

- Your engine is in decent condition and you can perform or supervise the installation.

- You want a "plug-and-play" modification with no tuning required.

- Your engine has significant wear (e.g., leaking valves, worn timing chain).

- You are not comfortable with basic engine work or carburetor adjustments.

- You prioritize resale value over performance gains.

For most enthusiasts, this is a **good mid-tier modification** that strikes a balance between cost, effort, and performance gains. Just be prepared to put in some work to get the best results.

Details:

I don't have a very accurate micrometer but see any excessive wear or damage. Combined shipping is available for multiple items. 1979-1982 Suzuki GS 850 G.

part #: 1271145111 prices

• $40.00-$99.95

specifications cyclevintagee:

• for models: Gs, 850
• for makes: Suzuki
• for years: 1979-1982
• mpn: 12711-45111
• part type: Intake Camshaft Cam Exhaust

offer cyclevintagee:

• started: May 10, 2026
• availability: In Stock
• best offers: True
• sold: 0
• options: Ship-to-home
• quantity: 1

shipping cyclevintagee:

• transit: 4-7 Days
• class: Expedited
• type: Fixed
• service: Expedited
• cost: $0.00

general cyclevintagee:

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

returns cyclevintagee:

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

payments cyclevintagee:

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• credit card: Mastercard

seller cyclevintagee:

• city: Chippewa Lake, Ohio
• # reviews: 116288
• rating: 99.9%

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