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  3. YAMAHA 878-11121-09-00

YAMAHA 878-11121-09-00 Right Head Straight 338

fits model: Gpx. make: Yamaha. year: 1974.

878-11121-09-00 Yamaha Oem 1974 Gpx 338 Vintage Snowmobile Right Hand Used Head Straight Style

( Part Type: Head ), ( Country Of Origin: Japan ), ( UPC: 878111210900 )

Review YAMAHA Oem 338 Vintage Snowmobile Right Hand Used Head Straight Style fits GPX 1974

The Yamaha GPX 338 is a vintage watercraft engine, specifically a right-handed head, straight type from the year 1974. This engine is part of Yamaha's GPX series, which was known for its high-performance capabilities in the water.

The GPX 338 is a two-stroke, three-cylinder engine. Each cylinder has a displacement of 111.1 cubic inches, totaling 338 cubic inches for the engine. The engine's bore and stroke measurements are 2.6 inches by 2.8 inches, respectively.

The engine's carburetion system is handled by two Mikuni VM28SS carburetors. These carburetors deliver a precise air-fuel mixture to the engine for efficient combustion. The intake system is designed to provide ample airflow to the engine for optimal power output.

The GPX 338 features a wet sump lubrication system that ensures the engine's moving parts are adequately lubricated. The engine also has a manual clutch and shift system, allowing the operator to control the engine's power input to the watercraft's drive system.

The engine's ignition system is a contact breaker type, with a total of six spark plugs. The engine's ignition timing can be adjusted to optimize power output and fuel efficiency. The engine also has a cooling system to keep the engine running at optimal temperatures.

The GPX 338 is a heavy-duty engine, designed to handle the rigors of watercraft use. The engine's cylinder block and crankshaft are made of high-strength materials to ensure durability and longevity. The engine also has heavy-duty bearings and seals to prevent leaks and wear.

The engine's exhaust system is designed to minimize noise and emissions. The exhaust port is positioned to provide optimal scavenging and power output. The engine's muffler is designed to reduce noise levels and meet emissions regulations.

The GPX 338 is a powerful and reliable engine that delivers impressive performance on the water. Its vintage design and high-performance capabilities make it a valuable addition to any watercraft enthusiast's collection. Whether you're restoring a classic watercraft or building a high-performance racecraft, the Yamaha GPX 338 is an excellent choice.

A Comprehensive Analysis of the Yamaha GPX 338 Right Head Straight (1974)

Introduction:

The Yamaha GPX 338 is a classic outboard motor that was produced in 1974. This model, specifically the right head straight version, is a popular choice among boat owners for its power, reliability, and classic design. In this analysis, we will discuss the pros and cons of purchasing this motor to help you make an informed decision.

Pros:

1. Power: The GPX 338 delivers an impressive 338 pounds of thrust, making it a powerful option for larger boats or those with heavy loads.

2. Reliability: Yamaha outboards are known for their durability and long-lasting performance. The GPX 338 is no exception, with many owners reporting that their motors have run for decades with minimal maintenance.

3. Fuel Efficiency: For its power output, the GPX 338 is relatively fuel-efficient, making it a cost-effective choice in the long run.

4. Classic Design: The GPX 338's classic design is a draw for many boat owners. Its appearance adds to the overall aesthetic of the boat and can be a conversation starter.

Cons:

1. Weight: At 561 pounds, the GPX 338 is a heavy motor. This can make it more difficult to install and transport compared to lighter options.

2. Emissions: The GPX 338 was produced before modern emissions regulations, so it may not meet current standards. This could limit its use in certain areas or require additional modifications.

3. Availability of Parts: As a classic motor, parts for the GPX 338 can be more difficult to find and may be more expensive compared to newer models.

4. Cost: The GPX 338 is a higher-priced option compared to newer, smaller outboard motors.

Conclusion:

The Yamaha GPX 338 Right Head Straight (1974) is a powerful, reliable, and classic outboard motor that offers many benefits. However, its weight, potential emissions issues, limited availability of parts, and high cost are important considerations. Ultimately, the decision to purchase this motor depends on your specific needs, budget, and preferences.

Recommendation:

If you are looking for a powerful and reliable outboard motor for a larger boat and appreciate the classic design, the Yamaha GPX 338 Right Head Straight (1974) could be an excellent choice. However, be prepared for the additional weight, potential emissions issues, and higher cost associated with this motor. Consider your budget, boat size, and preferred maintenance level before making a final decision.

Details:

Please review pictures carefully as they are a large part of the condition. Overall a good usable Left Hand head - please see photos as they are the best. The fins are in good condition with no cracks or breaks and inner dome looks a few small marks it. This LEFT HAND OEM Yamaha GPX head is overall in good used condition.

Overall in fair condition with some paint flaking and cosmetic wear. 1974 GPX 338. OEM # 878-11121-09-00 RIGHT HAND.

part #: 878111210900 price

  • $74.95

specifications enginesnowmobile:

  • for models: Gpx
  • for makes: Yamaha
  • for years: 1974
  • part type: Head
  • country of origin: Japan
  • upc: 878111210900

general enginesnowmobile:

  • Snowmobile Parts > Engines Components > Snowmobile Engine Components
  • condition: Used

seller enginesnowmobile:

  • city: Cornell, Wisconsin
  • # reviews: 1052
  • rating: 100.0%

shipping enginesnowmobile:

  • class: Standard, Expedited
  • service: USPS Ground Advantage, UPS Ground, USPS Priority Mail
  • cost: $9.04
  • carrier: USPS, UPS
  • transit: 4-8 Days
  • type: Calculated

payments enginesnowmobile:

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

returns enginesnowmobile:

  • policy: No Returns

offer enginesnowmobile:

  • best offers: True
  • started: May 14, 2026
  • availability: In Stock
  • quantity: 1
  • sold: 0
  • options: Ship-to-home
for models: gpx, for makes: yamaha, for years: 1974, part type: head, country of origin: japan,
category: snowmobile parts > engines components > snowmobile engine components, sku: 20306948682568721,
Yamaha 878-11121-09-00 Is Similar To:
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2 offers $74.95–$74.95 USD
  • Used. Offer #1 priced at $74.95 + $9.04 shipping estimate = $83.99* total. OEM # (RIGHT HAND) 1974 GPX 338.+$9.04 shipping
  • Used. Offer #2 priced at $74.95 + $9.04 shipping estimate = $83.99* total. +$9.04 shipping

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