1. Watercraft Intake & Fuel Systems Products
  2. sku: 15591007902308603
  3. COMPONENTSPLUS 28.6427-2-Z8

COMPONENTSPLUS 28.6427-2-Z8 Intake Valve Smr 77336030300 77336030200

fits model: Xc, Sx, Rr. make: Ktm.

28.6427-2-z8 Componentsplus New Intake Valve Fits Ktm Smr Rr Xc-f Sx-f By 77336030300 77336030200 28.6427-2

( Brand: Componentsplus ), ( Manufacturer Part Number: 28.6427-2-Z8 ), ( Part Type: Intake Valve ), ( Warranty: 1 Year ), ( California Prop 65 Warning: This Product May Expose You To Chemicals Which Are Known To The State Of California To Cause Cancer And Birth Defects Or Other Reproductive Harm. For More Information Go To Www.p65warnings.ca.gov ), ( Country Of Origin: Japan ), ( Oem Interchange Part Numbers1: 77336030200 ), ( Oem Interchange Part Numbers2: 77336030300 ), ( Product Notice: As A Parts Distributor We Mostly Sell Aftermarket Parts ), ( Source: Aftermarket )

Review COMPONENTSPLUS New Intake Valve Ktm Smr Xc f Sx By 28.6427-2 fits XC SX RR

The **ComponentsPlus 28.6427-2-Z8 Intake Valve** is a high-performance, precision-engineered component designed specifically for KTM s **SMR, XC-F, and SX-F** models, including the highly sought-after **77336030300 (2020 790cc XC-F/SX-F)** and **77336030200 (2019 650cc XC-F/SX-F)** engines, as well as the **28.6427-2** variant for earlier generations. Crafted from **high-grade, heat-treated steel**, this intake valve is built to withstand the extreme thermal and mechanical stresses of modern high-revving, fuel-injected two-stroke and four-stroke engines, ensuring reliable performance under aggressive riding conditions. The valve features a **smooth, polished intake port** optimized for maximum airflow efficiency, reducing restriction and enhancing throttle response critical for both off-road and track applications. Its **precision-machined stem and seat** guarantee a tight seal, minimizing blow-by and improving combustion efficiency, which directly translates to better power delivery and fuel economy. The **Z8 designation** indicates a specialized variant, likely incorporating advanced materials or machining techniques to further enhance durability and performance, making it a preferred upgrade for riders seeking a competitive edge. Whether installed in stock or modified engines, this valve is engineered to maintain structural integrity even under prolonged high-load operation, ensuring longevity and consistent performance across a wide range of riding scenarios. For enthusiasts looking to fine-tune their KTM s breathing characteristics or replace worn components, this intake valve represents a direct, high-quality replacement that adheres to OEM specifications while delivering measurable improvements in engine efficiency and responsiveness.

### **Pros and Cons of buying a ComponentsPlus 28.6427-2-Z8 Intake Valve (KTM SMR XC-F/SX-F Compatible)**

#### **Pros:**

1. **OEM Quality and Compatibility**

The valve is manufactured to match KTM s original specifications, ensuring a precise fit for the SMR XC-F and SX-F engines (part numbers 77336030300 and 77336030200). This reduces the risk of performance issues or leaks that can occur with aftermarket parts that don t align perfectly with the engine s design.

2. **Reliability and Durability**

ComponentsPlus is a reputable supplier of OEM and high-quality aftermarket parts, often using materials and manufacturing processes similar to those of the original equipment. This suggests the valve should be durable, especially if it s made from stainless steel or heat-treated alloys, which are common in high-performance engine components.

3. **Cost-Effective Replacement**

Purchasing this valve as a standalone part is likely cheaper than buying a full engine kit or a complete rebuild. It s an ideal solution for owners who need to replace a worn or damaged intake valve without overhauling the entire engine.

4. **Performance Benefits**

A properly functioning intake valve ensures optimal airflow into the cylinder, which can improve engine efficiency, throttle response, and overall power output. If the original valve was degraded (e.g., from carbon buildup, warping, or wear), replacing it can restore performance close to factory specifications.

5. **Easy Installation**

Intake valves are relatively straightforward to replace, especially with basic mechanical skills and the right tools. ComponentsPlus often provides clear part numbers and compatibility details, making it easier to source the correct valve and follow installation guidelines.

6. **Warranty or Return Policy**

ComponentsPlus typically offers warranties or return policies for their parts, providing peace of mind in case the valve fails prematurely or doesn t fit as expected. This is particularly useful for buyers who are unsure about the condition of their existing valve.

7. **Support for Maintenance**

Replacing an intake valve as part of routine maintenance (e.g., during a valve job or engine overhaul) can extend the lifespan of the engine. It prevents potential damage from a stuck or leaking valve, which could lead to more costly repairs down the line.

---

#### **Cons:**

1. **Potential for Counterfeit or Low-Quality Parts**

While ComponentsPlus is a legitimate supplier, there is always a risk of receiving a counterfeit or substandard part, especially if the seller is not verified or if the part is sourced from an unregulated third-party marketplace. Buyers should verify the seller s reputation and check for authenticity markings (e.g., serial numbers, branding) to avoid fakes.

2. **Limited Customization**

This is an OEM replacement valve, meaning it won t offer performance enhancements beyond restoring stock specifications. If the goal is to increase airflow or power (e.g., for racing or aggressive riding), a specialized aftermarket valve (e.g., from brands like **Moto-Max, KTM Performance Parts, or Walbro**) might be necessary. These valves often feature larger ports, lighter materials, or advanced coatings for better heat resistance.

3. **Installation Challenges**

While intake valves are relatively simple to replace, improper installation can lead to issues such as:

- **Seal failure**: If the valve seal (often a rubber or silicone gasket) is damaged or not properly seated, it can cause leaks, reducing compression and power.

- **Thread damage**: Over-tightening or cross-threading the valve can strip the threads in the cylinder head, requiring costly repairs.

- **Lubrication issues**: Forgetting to apply engine oil to the valve stem during installation can lead to excessive wear or seizing.

Buyers with limited mechanical experience may need to consult a professional mechanic to avoid these pitfalls.

4. **Compatibility Confusion**

The part number **28.6427-2-Z8** is designed for KTM s **SMR (Single Motor Racing) engines**, which are used in the **XC-F and SX-F models**. However, there are slight variations between the **77336030300 (likely the 2020 model)** and **77336030200 (likely the older model)**. Double-checking the exact year and engine variant of your bike is critical to ensure the valve fits correctly. Mixing up part numbers could result in a valve that doesn t align with the cylinder head or valve spring.

5. **Cost of Additional Components**

Replacing an intake valve often requires replacing other related parts, such as:

- **Valve seals or gaskets** (if worn or damaged).

- **Valve springs** (if they are stretched or weak).

- **Retainers and locks** (to ensure proper valve retention).

Ignoring these components can lead to recurring issues, increasing long-term costs.

6. **Skill Dependency**

If the buyer lacks experience with engine disassembly or valve jobs, the process can be time-consuming and frustrating. Mistakes during installation (e.g., mixing up intake and exhaust valves, improper gap setting) can void warranties or cause engine damage.

7. **Limited Availability of After-Sales Support**

While ComponentsPlus provides part numbers and compatibility details, some buyers may encounter issues with installation or performance. If the valve fails shortly after purchase, resolving the problem may require contacting customer support, which could be time-consuming or unhelpful if the issue is complex.

---

### **Conclusion:**

The **ComponentsPlus 28.6427-2-Z8 intake valve** is a **reliable OEM replacement** for KTM SMR XC-F and SX-F engines, offering a cost-effective way to restore factory performance and prevent engine damage. It is ideal for owners who:

- Need a **direct replacement** for a worn or damaged valve.

- Prioritize **compatibility and durability** over performance gains.

- Have **basic mechanical skills** or access to professional help for installation.

However, buyers should be cautious of **counterfeit parts**, **installation errors**, and the **need for complementary components** (e.g., seals, springs). If the goal is **enhanced performance** (e.g., increased airflow, better heat resistance), an aftermarket valve may be a better choice.

---

### **Recommendation:**

1. **Verify Compatibility**

Confirm that your bike s **exact model year and engine variant** match the part number (77336030300 or 77336030200). Check the **cylinder head markings** or consult KTM s service manual for the correct valve dimensions.

2. **Purchase from a Trusted Source**

Buy the valve from **ComponentsPlus s official website or an authorized dealer** to avoid counterfeit parts. Avoid third-party sellers unless they are verified and have positive reviews.

3. **Prepare for Installation**

Gather all necessary tools (e.g., valve spring compressor, torque wrench, gasket scraper) and **replacement seals/valve springs** if they appear worn. Follow KTM s service manual or a trusted online guide (e.g., **KTM Factory Service Manual, Haynes Manual**) for step-by-step instructions.

4. **Consider Professional Help if Needed**

If you re unsure about disassembling the engine or setting valve clearances, take the bike to a **KTM-certified mechanic** or a reputable motorcycle shop. This ensures proper installation and avoids costly mistakes.

5. **Monitor Performance After Installation**

After replacing the valve, listen for **unusual noises** (e.g., tapping, hissing) and watch for **performance drops** (e.g., rough idling, loss of power). If issues persist, inspect the valve and surrounding components for proper installation.

6. **Explore Aftermarket Options for Performance**

If you re looking to **improve airflow or power**, research **aftermarket intake valves** from brands like **Moto-Max, Walbro, or KTM Performance Parts**. These valves often feature **larger ports, lighter materials, or advanced coatings** for better heat resistance and performance.

**Final Verdict:**

For **restoration of stock performance** and **reliable OEM replacement**, the **ComponentsPlus 28.6427-2-Z8 intake valve** is a **solid choice**. However, buyers should **prioritize proper installation, compatibility verification, and complementary part replacements** to ensure long-term reliability. If performance upgrades are the goal, consider aftermarket alternatives.

Details:

Aftermarket parts are not sourced from the original vehicle or equipment manufacturer, but designed to function same as - if better than. All parts sold are new. Warranty does not cover failure due to accident, abuse, neglect or as the result of normal wear and tear. Product Notice: As a parts distributor we mostly sell aftermarket any OEM would be noted as such.

KTM model's: RR 450CC 2014, SMR 2008 -2012, SX ATV 2009 -2010, 505CC SX-F 2007 -2012, 2008, XC-F 2008 - 2009, 2008 - 2009. FITS / Replacement Part Numbers: INTAKE VALVE, SPECIFICATIONS: NOTE 1: TITANIUM 2 REQ. ComponentsPlus products, when properly installed, are warranted against defects in materials and workmanship to the original purchaser for a period of one 1 year from date purchase.: Intake Valve Replaces: Source: Aftermarket.

New Intake Valve Fits KTM SMR RR XC-F SX-F By 28.6427-2: THIS ITEM FITS VARIOUS APPLICATIONS BY PART NUMBER.

part #: 2864272z8 prices

  • $74.87-$188.47

specifications jetskiintakeez:

  • for models: Xc, Sx, Rr
  • for makes: Ktm
  • brand: Componentsplus
  • mpn: 28.6427-2-z8
  • part type: Intake Valve
  • warranty: 1 Year
  • california prop 65 warning: This Product May Expose You To Chemicals Which Are Known To The State Of California To Cause Cancer And Birth Defects Or Other Reproductive Harm. For More Information Go To Www.p65warnings.ca.gov
  • country of origin: Japan
  • oem interchange part numbers1: 77336030200
  • oem interchange part numbers2: 77336030300
  • product notice: As A Parts Distributor We Mostly Sell Aftermarket Parts
  • source: Aftermarket

shipping jetskiintakeez:

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  • service: Economy, Standard, Expedited, Overnight
  • transit: 2-6 Days
  • type: Fixed
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seller jetskiintakeez:

  • rating: 98.8%
  • city: Morrisville, North Carolina
  • # reviews: 52547

returns jetskiintakeez:

  • policy: Returns Accepted
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offer jetskiintakeez:

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  • started: March 4, 2026

general jetskiintakeez:

  • condition: New
  • Parts Accessories > Personal Watercraft Parts > Intake Fuel Systems
for models: xc, sx, rr, for makes: ktm, part type: intake valve, warranty: 1 year, california prop 65 warning: this product may expose you to chemicals which are known to the state of california to cause cancer and birth defects or other reproductive harm. for more information go to www.p65warnings.ca.gov, country of origin: japan, oem interchange part numbers1: 77336030200, oem interchange part numbers2: 77336030300, product notice: as a parts distributor we mostly sell aftermarket parts, source: aftermarket,
category: watercraft parts > intake fuel systems, sku: 15591007902308603,
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3 offers $74.87–$188.47 USD
  • New. Offer #1 priced at $74.87 + $0.00 shipping estimate = $74.87* total. Product Type: Intake Valve Replaces: Source: Aftermarket.FREE SHIPPING
  • New. Offer #2 priced at $94.24 + $0.00 shipping estimate = $94.24* total. FREE SHIPPING
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