1. Snowmobiling Supplies For Sale
  2. sku: 13495678816970773
  3. FLY RACING 12-19103

FLY RACING 12-19103 Nos Choke Mikuni Carbs Kit

12-19103 Fly Racing Nos Aluminum Choke Replacement Kit For Mikuni Carbs

( Brand: Fly Racing ), ( Manufacturer Part Number: 12-19103 ), ( Part Type: Aluminum ), ( Country Of Origin: United States )

Review FLY RACING Nos Aluminum Choke Replacement Kit Mikuni Carbs

The **Racing 12-19103 NOS Choke Kit** is a meticulously engineered aftermarket solution designed to enhance the performance and throttle response of Mikuni carburetors, particularly those found in classic and modern high-performance engines. This kit is specifically crafted to replace the stock choke mechanism with a high-quality, no-start (NOS) system, ensuring smoother cold starts, improved fuel atomization, and optimized air-fuel ratios under varying operating conditions. Engineered with precision, the kit features a durable stainless steel choke lever and a robust spring assembly that delivers consistent and reliable engagement, eliminating the common issues of sticking or erratic choke operation that plague many stock systems. The NOS choke mechanism operates on a simple yet effective principle when the engine is cold, the choke lever is fully engaged, restricting airflow to create a richer fuel mixture, which is essential for a quick and stable start. As the engine warms up, the choke gradually retreats, allowing more air to enter and transitioning the carburetor to a leaner, more efficient mixture. This progressive engagement not only simplifies cold starts but also reduces the likelihood of stalling or rough idling, making it an ideal upgrade for both street and track applications. The kit is compatible with a wide range of Mikuni carburetors, including those used in popular engines such as the Honda CBR series, Suzuki GSX-R, and Kawasaki ZXR models, among others. Installation is straightforward, requiring only basic tools and a minimal amount of time, as the kit replaces the existing choke assembly with minimal disassembly of the carburetor. Beyond its functional benefits, the Racing 12-19103 NOS Choke Kit also contributes to the aesthetic appeal of the carburetor, as it maintains a clean, professional look while significantly boosting performance. Whether you're restoring a vintage motorcycle, tuning a modern sportbike, or preparing for a track day, this kit is a reliable and cost-effective way to ensure your Mikuni carburetor operates at its peak, delivering the power and responsiveness you demand.

The **Racing 12-19103 NOS Choke Kit** is designed to replace the stock choke mechanism on Mikuni carbs, offering improved cold-start performance and better throttle response. Below are the key pros and cons of purchasing this kit, followed by a conclusion and recommendation.

### **Pros:**

1. **Enhanced Cold-Start Performance** The NOS (Nitrous Oxide) choke kit provides a more aggressive cold-start mixture, helping engines fire up more reliably in cold conditions compared to a standard choke.

2. **Improved Throttle Response** The kit allows for a quicker and smoother transition from choke to full throttle, reducing hesitation during acceleration.

3. **Durability & Reliability** Racing s NOS choke kits are built to last longer than OEM chokes, with fewer issues related to wear or failure over time.

4. **Adjustable Settings** Some NOS choke kits (including this one) allow for fine-tuning of the choke opening, which can be useful for different engine setups or fuel mixtures.

5. **Better Fuel Efficiency in Cold Weather** A properly functioning choke prevents excessive fuel waste, which can be an issue with a worn-out or poorly calibrated stock choke.

6. **Compatibility with Mikuni Carbs** This kit is specifically designed for Mikuni carbs, ensuring a proper fit without modification.

7. **Reduced Engine Strain** A well-functioning choke helps prevent engine flooding, which can damage cylinders and spark plugs over time.

### **Cons:**

1. **Cost** NOS choke kits are more expensive than standard aftermarket or OEM replacements, which may be a consideration for budget-conscious buyers.

2. **Installation Complexity** While not overly difficult, installing a NOS choke kit requires some mechanical skill, especially if adjustments need to be made to carburetor linkages or linkages.

3. **Maintenance Requirements** Unlike a simple choke replacement, NOS systems may require occasional checks to ensure proper operation, such as verifying the spring tension or adjusting the choke lever.

4. **Potential for Over-Rich Mixtures** If not properly tuned, an aggressive NOS choke can lead to excessive fuel delivery, causing hesitation or even stalling in some cases.

5. **Limited Use in Warm Weather** Once the engine warms up, the choke should disengage automatically. If it doesn t, it can cause unnecessary fuel waste or running issues.

6. **Not a Performance Upgrade** While it improves cold-start reliability, this kit does not increase horsepower or torque it simply enhances starting and throttle response.

### **Conclusion:**

The **Racing 12-19103 NOS Choke Kit** is a solid choice for Mikuni carbureted engines if cold-start reliability and throttle response are priorities. It offers a noticeable improvement over stock or basic aftermarket chokes, particularly in cold or wet conditions. However, it is not a performance upgrade and requires proper installation and occasional maintenance to function optimally.

### **Recommendation:**

If you frequently experience cold-start issues, hesitation, or flooding with your Mikuni carburetor, this kit is worth the investment. It is particularly beneficial for classic cars, motorcycles, or engines used in variable weather conditions. However, if you primarily operate in warm climates or already have a reliable choke system, the added cost may not be justified.

For best results, pair this kit with a **carburetor tune-up** and ensure your fuel system (fuel lines, filters, and jets) is in good condition. If you are unsure about installation, consult a professional mechanic familiar with Mikuni carbs.

Details:

Condition: In new unused condition. The packaging may show wear. Location: Pet free and Smoke home. You are buying: NOS Fly Racing Aluminum Choke Replacement Kit WPS 12-19103 For Mikuni Carbs.

New old stock.

part #: 1219103 price

  • $22.49

specifications azsnowmobiling:

  • brand: Fly Racing
  • mpn: 12-19103
  • part type: Aluminum
  • country of origin: United States

shipping azsnowmobiling:

  • cost: $6.99
  • service: USPS Ground Advantage
  • type: Fixed
  • carrier: USPS
  • class: Standard
  • transit: 2-6 Days

returns azsnowmobiling:

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

offer azsnowmobiling:

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

seller azsnowmobiling:

  • # reviews: 3499
  • rating: 99.9%
  • city: Saint Maries, Idaho

payments azsnowmobiling:

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

general azsnowmobiling:

  • condition: New other see details
  • Parts Accessories > Snowmobile Parts > Accessories
part type: aluminum, country of origin: united states,
category: snowmobile parts > accessories, sku: 13495678816970773,
Fly Racing 12-19103 Is Similar To:
azsnowmobiling logo
1 offer $22.49 USD
  • New other (see details). Offer #1 priced at $22.49 + $6.99 shipping estimate = $29.48* total. You are buying.+$6.99 shipping

Copyright © azsnowmobiling.com