OMC 309935 Orifice Plug Jet Nos 68

( Manufacturer Part Number: 309935 ), ( Part Type: Jet Plug )

Review OMC Orifice Plug Jet 68 Nos

The **OMC 309935 Orifice Plug Jet** is a precision-engineered component designed for high-performance internal combustion engines, particularly those requiring optimized fuel delivery and combustion efficiency. This set of **68 orifice plugs** is meticulously crafted to fit seamlessly into the fuel injection system, ensuring consistent and accurate metering of fuel into the combustion chamber. Each plug is manufactured from durable, corrosion-resistant materials, such as high-grade brass or stainless steel, to withstand the harsh conditions of engine operation, including exposure to fuel vapors, heat, and mechanical stress. The design incorporates a precisely machined orifice an internal passage of uniform diameter which regulates the flow rate of fuel with exceptional accuracy, allowing for fine-tuning of engine performance, throttle response, and emissions compliance.

Ideal for applications in **high-performance street cars, racing engines, or modified fuel injection systems**, these orifice plugs are engineered to enhance fuel atomization and combustion efficiency, leading to improved power output, smoother operation, and reduced fuel consumption. The consistent orifice size across all 68 plugs ensures uniformity in fuel delivery, which is critical for maintaining balanced engine performance and preventing issues such as lean or rich fuel mixtures that could lead to detonation, reduced longevity, or increased emissions. Whether used in a **port fuel injection (PFI) system, throttle-body injection (TBI), or aftermarket fuel management setup**, these plugs are a reliable choice for enthusiasts and professionals seeking precision and durability.

The **OMC 309935** series is particularly well-suited for engines that demand fine-tuned calibration, such as those equipped with **electronic fuel injection (EFI) systems** or those undergoing modifications like turbocharging, supercharging, or cylinder head swaps. The plugs are designed to be easily installed and removed, allowing for quick adjustments during tuning or troubleshooting. Their robust construction and consistent quality make them a trusted component for both stock and modified engines, ensuring reliable operation under demanding conditions. For those seeking to optimize their engine s performance while maintaining reliability, the **OMC 309935 Orifice Plug Jet** set provides the precision and durability required to meet the highest standards of automotive engineering.

### **Pros and Cons of buying a OMC 309935 Orifice Plug Jet (68 No.)**

1. **Compatibility and Fit:** The OMC 309935 orifice plug jet is designed specifically for OMC marine engines, ensuring a proper fit and optimal performance without modifications. This reduces the risk of leaks or improper installation, which can damage the engine over time.

2. **Performance Optimization:** Orifice jets regulate fuel flow, and the correct jet size (68 in this case) helps maintain the engine s intended power output and fuel efficiency. Using the correct jet ensures the engine runs smoothly without excessive fuel consumption or poor combustion.

3. **Durability and Quality:** OMC (Original Marine Corporation) is a trusted brand known for manufacturing reliable marine parts. The orifice plug jet is made from durable materials that can withstand the demands of marine environments, including exposure to saltwater, vibrations, and temperature fluctuations.

4. **Easy Installation:** These parts are typically designed for straightforward replacement, requiring minimal tools and expertise. Most marine mechanics or even experienced DIYers can install them without significant difficulty.

5. **Cost-Effective Replacement:** Compared to rebuilding or replacing an entire carburetor or fuel system, replacing a single orifice plug jet is a relatively inexpensive fix. This makes it a practical solution for minor performance or fuel delivery issues.

6. **Warranty Coverage:** OMC parts often come with manufacturer warranties, providing some assurance against defects in materials or workmanship. This can offer peace of mind if the part fails prematurely.

7. **Availability of Support:** OMC has a network of dealers and technical support that can assist with installation guidance, troubleshooting, or part identification, ensuring a smoother experience for the buyer.

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1. **Limited Use Case:** This specific orifice plug jet (68) is tailored for certain OMC engines, particularly those requiring a medium-sized jet for balanced fuel delivery. If the engine is modified (e.g., turbocharged, supercharged, or tuned for higher performance), this jet may not be suitable, potentially leading to poor performance or damage.

2. **Potential for Misapplication:** Purchasing the wrong jet size or part number due to confusion with other OMC models could result in incorrect fuel delivery, leading to issues like rich or lean mixtures, poor starting, or engine stalling. Always verify compatibility with the engine s specifications.

3. **Depreciation:** Like all marine parts, orifice plugs may degrade over time due to wear, corrosion, or clogging from fuel contaminants. While durable, they are not designed for indefinite use and may need replacement periodically.

4. **Dependence on Professional Installation:** While installation is straightforward, improper handling (e.g., cross-threading, overtightening, or using incorrect tools) can damage the carburetor or engine. Those without experience may benefit from having a professional install it.

5. **Market Availability:** Depending on the region, OMC parts may not be as widely available as more generic brands. This could lead to longer wait times for delivery or higher shipping costs.

6. **Cost Relative to Other Brands:** While OMC parts are reliable, they may be priced higher than aftermarket alternatives. For budget-conscious buyers, generic orifice plugs (from brands like Mikuni or Walbro) might be considered, though compatibility and longevity could vary.

7. **Environmental Factors:** Marine environments are harsh, and even high-quality parts can suffer from saltwater corrosion, algae buildup, or fuel contamination over time. Regular maintenance is required to ensure the orifice plug functions correctly.

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The OMC 309935 orifice plug jet (68) is a well-engineered, reliable part for OMC marine engines when used correctly. Its primary advantages lie in its compatibility, durability, and ease of installation, making it a practical choice for maintaining or restoring engine performance. However, its suitability depends on the specific engine model and application. Buyers must ensure they select the correct jet size and handle installation carefully to avoid issues.

For most standard OMC engines running under normal conditions, this part is a sound investment. Those considering modifications or operating in extreme conditions should consult an expert to confirm compatibility and potential adjustments.

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- **Buy if:** You are maintaining or repairing an OMC marine engine that requires a 68 orifice plug jet, and you have confirmed the part number matches your engine model. The engine is not heavily modified, and you are either experienced in DIY repairs or plan to have a professional install it.

- **Avoid if:** You are unsure of the engine s exact requirements, the engine has been significantly modified, or you are looking for a cheaper alternative without sacrificing quality. In such cases, consult the engine s service manual or a marine mechanic before purchasing.

- **Alternatives to Consider:** If cost is a concern, explore aftermarket orifice plugs from reputable brands (e.g., Mikuni, Walbro) that offer similar performance. Always prioritize compatibility and quality over price.

Ultimately, the OMC 309935 orifice plug jet is a strong choice for its intended use, provided the buyer takes the necessary steps to ensure proper application.

Details:

All parts are in stock and ready to ship. Items are shipped using USPS, UPS, and FedEx. Tarnished, shelf wear. Pictures: Thumbnails.

If the original package is included it may show signs of wear. Orifice Plug Jet 68 is new and in good condition, not original packaging. OMC 309935 Orifice Plug Jet 68 NOS.

part #: 309935 prices

• $12.99-$15.28

specifications ouboaen:

• for makes: Omc
• mpn: 309935
• part type: Jet Plug

returns ouboaen:

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

shipping ouboaen:

• transit: 3-9 Days
• carrier: USPS, UPS
• type: Calculated
• class: Standard, Expedited, One-day
• cost: $0.00
• service: USPS Ground Advantage, USPS Priority Mail Flat Rate Envelope, UPS Next Day Air, UPS 2nd Day Air

seller ouboaen:

• rating: 99.9%
• city: Ashaway, Rhode Island
• # reviews: 130287

offer ouboaen:

• best offers: True
• quantity: 8
• options: Ship-to-home
• started: March 16, 2026
• availability: In Stock
• sold: 0

payments ouboaen:

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

general ouboaen:

• condition: New other see details
• Boat Parts > Outboard Engines Components > Intake Fuel Systems

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