SKI-DOO 027-840-10 Top End Rebuild Kit Rotax 346 59.5MM

( Brand: Ski-doo ), ( Manufacturer Part Number: 027-840-10 )

Review SKI DOO Top End Rebuild Kit 346 Rotax 59.5mm fits TNT STD 340 1973–1978

The Ski-Doo 027-840-10 Top End Rebuild Kit is specifically designed for TNT 340, 346, Rotax engines with a 59.5mm standard bore, manufactured between the years 1973 and 1978. This comprehensive rebuild kit includes all the necessary components required to restore your engine to its original performance level.

The kit starts with a set of high-quality pistons, rings, and wrist pins. The pistons are engineered for durability and efficiency, while the rings ensure proper compression and sealing. The wrist pins securely connect the pistons to the crankshaft for optimal power transfer.

Additionally, the kit includes new cylinders, which are essential for providing a smooth and even combustion process. These cylinders have been precision-machined to ensure a perfect fit and are designed to withstand the rigors of high-performance snowmobiling.

The Top End Rebuild Kit also comes with new gaskets, such as the cylinder head gasket, intake manifold gasket, and valve cover gasket. These gaskets ensure a proper seal between the various engine components, preventing leaks and ensuring optimal engine performance.

Furthermore, the kit includes new valves and valve springs. These components regulate the flow of air and fuel into the engine and are crucial for proper engine function. The new valves and springs provide improved performance and durability compared to worn-out parts.

Lastly, the kit includes various hardware components, such as bolts, nuts, and studs, to ensure a secure installation of the new parts. The hardware is made from high-strength materials to provide long-lasting performance and reliability.

In summary, the Ski-Doo 027-840-10 Top End Rebuild Kit is a complete solution for restoring the performance of your TNT 340, 346, Rotax engine with a 59.5mm standard bore from 1973 to 1978. With new pistons, rings, wrist pins, cylinders, gaskets, valves, valve springs, and hardware, this kit provides everything you need to breathe new life into your engine and get back out on the snow.

Top End Rebuild Kit for Ski-Doo TNT 340 and 346 (027-840-10) - Pros, Cons, and Conclusion

The Ski-Doo 027-840-10 Top End Rebuild Kit is designed for the TNT 340 and 346 models produced between 1973 and 1978 with the Rotax 59.5mm standard engine. In this analysis, we will discuss the key advantages and disadvantages of purchasing this rebuild kit and conclude with a recommendation.

1. Compatibility: The kit is specifically designed for the TNT 340 and 346 models, ensuring a perfect fit.

2. Quality: The Ski-Doo brand is known for producing high-quality parts, and this rebuild kit is no exception.

3. Inclusiveness: The kit comes with all the necessary components required for a top end rebuild, making it a one-stop solution.

4. Cost-effective: Rebuilding an engine instead of buying a new one can save significant costs in the long run.

5. Performance: A rebuilt engine can improve performance and increase the lifespan of the Snowmobile.

1. Complexity: A top end rebuild is a complex process that requires technical knowledge and skills.

2. Time-consuming: The rebuild process can take several hours to complete, depending on the individual's experience and the availability of tools.

3. Risk: There is always a risk of damaging other engine components during the rebuild process.

4. Labor costs: If one chooses to have the rebuild done by a professional, labor costs can add up.

5. Tools and equipment: The rebuild process requires specialized tools and equipment, which may need to be purchased or rented.

The Ski-Doo 027-840-10 Top End Rebuild Kit is an excellent investment for owners of TNT 340 and 346 Snowmobiles produced between 1973 and 1978. While the rebuild process can be complex and time-consuming, it offers several advantages, including cost savings, improved performance, and a longer engine lifespan. However, it requires technical knowledge, skills, tools, and dedication.

If you are comfortable with the complexity and time commitment involved in a top end rebuild, the Ski-Doo 027-840-10 Top End Rebuild Kit is an excellent choice. However, if you lack the necessary technical skills, consider hiring a professional to ensure a successful and efficient rebuild. Alternatively, if you prefer a more straightforward solution, consider purchasing a remanufactured engine or a new Snowmobile altogether.

Details:

Piston Size: 59.5mm, Pistons Are Standard STOCK Size Original Bore: Need a different size. Top End Gasket Kit. See List for Compatibility The listing is 1 NEW Top End Repair Kit Ski-Doo 346cc Snowmobile. Untitled Document, 1 x Top End Engine Rebuild Kit Ski-Doo 340.

Ski-Doo TNT 340 FA 1978.

part #: 02784010 price

• $199.95

specifications enginesnowmobile:

• for models: Tnt, Std, 340
• for makes: Skidoo, Ski-doo
• for years: 1973-1978
• brand: Ski-doo
• mpn: 027-840-10

seller enginesnowmobile:

• city: Seymour, Wisconsin
• # reviews: 11741
• rating: 99.8%

shipping enginesnowmobile:

• transit: 3-6 Days
• class: Standard
• cost: $0.00
• service: Standard
• type: Fixed

general enginesnowmobile:

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

payments enginesnowmobile:

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

offer enginesnowmobile:

• availability: In Stock
• options: Ship-to-home
• sold: 0
• best offers: True
• quantity: 2
• started: January 9, 2026

returns enginesnowmobile:

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

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