YAMAHA CM-PD42J Carburetor Carb 727779787511 AUTOSTAR2001

( Manufacturer Part Number: CM-PD42J ), ( Manufacturer Warranty: 1 Year ), ( Type: Carburetor ), ( Country Of Origin: China ), ( UPC: 727779787511 )

Review YAMAHA Carburetor Carb New fits GRIZZLY YFM660 660 2002–2008

The **Autostar 2001 CM-PD42J Carburetor** is a meticulously engineered, high-performance replacement carburetor designed specifically for Yamaha s legendary **YFM660 Grizzly 660** models produced between **2002 and 2005**, with additional compatibility for the **2008 model year**. Built to restore and enhance the throttle response, fuel efficiency, and overall power delivery of this rugged off-road machine, this carburetor represents a premium upgrade over the stock unit, ensuring a seamless fit and reliable performance in demanding conditions. Crafted with precision, the **CM-PD42J** features a **42mm bore**, a dimension carefully calibrated to optimize airflow while maintaining the Grizzly s signature balance of torque and smoothness. Its **aluminum body** is not only lightweight but also resistant to corrosion, ensuring durability even when subjected to dust, mud, and harsh off-road environments. The carburetor incorporates a **floating bowl design**, allowing for easy maintenance and fuel line adjustments, while its **precision-machined jets and needles** deliver optimal fuel metering for both cold starts and high-RPM performance. Engineered with **Autostar s proprietary tuning**, this carburetor eliminates common issues like lean running, rough idling, or sluggish acceleration, providing a more responsive and consistent power band across the entire RPM range. Whether you re tackling rocky trails, climbing steep hills, or cruising on paved roads, the **CM-PD42J** ensures that your Yamaha YFM660 Grizzly 660 operates with the precision and power it was built for. Backed by Autostar s reputation for quality and performance, this carburetor is an ideal choice for riders seeking to revive their bike s original performance or push it to new limits with a reliable, high-quality upgrade.

### **Pros and Cons of Buying an Autostar 2001 CM-PD42J Carburetor for a Yamaha YFM660 Grizzly (2002 2005, 2008)**

1. **Improved Performance** The CM-PD42J is a high-performance carburetor designed for better throttle response, smoother power delivery, and increased horsepower compared to the stock Keihin carburetor on the YFM660. It features a larger bore and optimized airflow, which can enhance acceleration and top-end power.

2. **Better Fuel Economy (Under Certain Conditions)** While fuel economy may not improve significantly in all riding scenarios, the CM-PD42J s refined tuning can lead to more efficient fuel delivery under specific conditions, such as steady cruising speeds.

3. **Enhanced Throttle Response** The carburetor s design reduces lag, making the engine more responsive to throttle inputs, which is particularly noticeable in off-road or aggressive riding situations.

4. **Durability and Reliability** Autostar carburetors are known for their robust construction, often featuring high-quality materials and precise machining. This can result in fewer clogs and better longevity compared to some aftermarket alternatives.

5. **Compatibility with Modifications** If you plan to further modify your YFM660 (e.g., exhaust, clutch, or suspension upgrades), the CM-PD42J can better support those changes by providing a more robust power output.

6. **Aftermarket Support** Autostar is a well-regarded brand in the ATV and motorcycle performance community, meaning parts, tuning guides, and community support are readily available.

7. **Potential for Easier Maintenance** The CM-PD42J s design often allows for simpler cleaning and adjustment compared to some stock carburetors, reducing long-term hassle.

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1. **Cost** The CM-PD42J is more expensive than the stock Keihin carburetor, often ranging between **$200 $350**, depending on the seller and additional accessories (e.g., gaskets, fuel line kits). This can be a significant investment for a bike that may not see heavy daily use.

2. **Tuning Required** Simply swapping in the CM-PD42J without proper tuning (air-fuel ratio adjustments, ignition timing, or exhaust modifications) can lead to **poor performance, rough idling, or even engine damage**. Many riders report needing a **professional tune-up** or **ECU flash** to optimize the setup.

3. **Potential for Overpowering the Stock Drivetrain** The YFM660 s stock drivetrain (clutch, transmission, and final drive) is not built for extreme power gains. Without accompanying modifications (e.g., clutch upgrade, heavier flywheel, or gearing changes), the extra power from the CM-PD42J could **strain the drivetrain**, leading to premature wear or failure.

4. **Fuel System Upgrades May Be Necessary** The CM-PD42J s increased airflow may require a **larger fuel pump, upgraded fuel lines, or a fuel pressure regulator** to prevent fuel starvation under high-load conditions. Neglecting this can cause **poor performance or engine flooding**.

5. **Learning Curve for Installation** While not overly complex, installing a carburetor requires careful attention to **gasket sealing, throttle cable adjustment, and fuel line routing**. Mistakes here can lead to leaks or improper operation.

6. **Not a Guaranteed Power Gain** Results vary based on **engine condition, fuel quality, and tuning**. Some riders report noticeable improvements, while others see minimal differences if the bike was already well-maintained.

7. **Potential for Voiding Warranty (If Applicable)** If your YFM660 is under warranty, modifying the carburetor may void coverage, especially if the manufacturer considers it an "aftermarket" change.

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The **Autostar CM-PD42J is a solid upgrade for the Yamaha YFM660** if you are looking to **enhance performance, throttle response, and reliability** but it is **not a plug-and-play solution**. It requires **proper tuning, potential drivetrain upgrades, and attention to fuel system adjustments** to avoid issues.

If you **ride aggressively, plan to modify other components, or want a noticeable power boost**, the CM-PD42J is a worthwhile investment. However, if you **rarely push the bike hard, prioritize cost efficiency, or prefer minimal modifications**, the stock carburetor may suffice with regular maintenance.

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- **Get a professional tune-up** (ECU flash or manual tuning) to optimize performance.

- **Upgrade the drivetrain** (clutch, flywheel, or final drive) if you plan to ride hard.

- **Ensure proper fuel system support** (fuel pump, lines, and pressure regulator).

- **Test ride thoroughly** before committing to heavy use.

- **Try a less expensive alternative first**, such as **cleaning and rebuilding the stock carburetor** or installing a **high-flow air filter** to see if performance improves.

- **Consult with experienced YFM660 riders** in forums (e.g., ATV.com, Yamaha forums) for real-world feedback on the CM-PD42J s performance on your specific model year.

- **Ideal for riders who want a noticeable power increase** (e.g., for racing, heavy off-roading, or towing).

- **Not ideal for casual riders** who only use the bike for light trail riding or commuting.

Ultimately, the CM-PD42J is a **high-quality carburetor upgrade**, but its benefits depend heavily on **how you ride and whether you support it with proper modifications**. If you re willing to invest time and money into tuning and maintenance, it can significantly enhance your YFM660 s performance.

Details:

1x Throttle Base Rubber Gasket. 1x Throttle Base Cover. Package: 1x Carburetor. Fit For: Yamaha model's.

Carburetor For Yamaha YFM660 Grizzly 660 2002 2003 2004 2005 - 2008 Carb NEW.

part #: cmpd42j prices

• $42.64-$125.64

specifications carbthrotatv:

• for models: Yfm660, 660, Grizzly
• for makes: Yamaha
• for years: 2002-2008
• mpn: Cm-pd42j
• manufacturer warranty: 1 Year
• type: Carburetor
• country of origin: China
• upc: 727779787511

shipping carbthrotatv:

• type: Fixed
• service: Standard
• cost: $0.00
• transit: 5-8 Days
• class: Standard

offer carbthrotatv:

• availability: In Stock
• best offers: True
• started: May 29, 2026
• sold: 0
• options: Ship-to-home

returns carbthrotatv:

• paid by: Seller
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seller carbthrotatv:

• # reviews: 7654
• city: Rowland height, California
• rating: 99.2%

general carbthrotatv:

• condition: New
• ATV, Side-by-Side UTV Parts Accessories > Air Intake Fuel Delivery > Carburetors

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