fits model: Ct70, Trail. make: Honda. year: 1970–1981.

( Manufacturer Part Number: 11100-086-701 ), ( Part Type: Engine Case )
The Honda CT70 Trail 1981 Engine (Left/Right: 11100-086-701) is a renowned piece of machinery from Honda's rich history of two-wheeled engines. This engine, specifically designed for the right and left sides of the 1981 CT70 Trail model, is a testament to Honda's commitment to delivering reliable, high-performing engines.
The 11100-086-701 engine is a 4-stroke, air-cooled, single-cylinder powerhouse, boasting a displacement of 69.9 cubic centimeters. It's equipped with a 4.2:1 compression ratio, which, in combination with its 3.9 horsepower, ensures a smooth and efficient performance, even when tackling challenging terrains.
The engine features a simple yet effective carburetor system, ensuring easy starting and smooth power delivery. The fuel tank capacity is 1.1 gallons, providing ample fuel for your off-road adventures.
The engine's design prioritizes durability and longevity. It features a forged crankshaft, a single-ring piston, and a cast-iron cylinder liner, all of which contribute to its robustness and ability to withstand the rigors of off-road use.
The 11100-086-701 engine is also known for its ease of maintenance. Its air-cooling system eliminates the need for a radiator, reducing maintenance requirements. Additionally, the engine's simple design makes it easy to troubleshoot and repair, should the need arise.
In conclusion, the Honda 11100-086-701 engine is a powerful, reliable, and low-maintenance option for your 1981 CT70 Trail. Whether you're a seasoned off-road enthusiast or a beginner just starting your journey, this engine is sure to provide you with the power and performance you need to conquer any trail.
Pros of buying a Honda CT70 1981 engine (Honda 11100-086-701):1. Reliability: Honda is known for its durability and reliability, and the CT70 engine is no exception. With proper maintenance, it can last for many years.
2. Affordability: Compared to newer models, the CT70 engine is relatively affordable. It's a great option for those looking for a reliable engine without breaking the bank.
3. Easy to repair: The CT70 engine is known for its simplicity, making it easy to repair and maintain. It uses common parts that are easy to find, which can save you time and money in the long run.
4. Versatility: The CT70 engine is commonly used in various applications, such as ATVs, go-karts, and even as a parts donor. This makes it a popular choice for DIY enthusiasts and hobbyists.
Cons of buying a Honda CT70 1981 engine (Honda 11100-086-701):1. Limited power: The CT70 engine is not known for its high power output. It may not be suitable for those looking for a high-performance engine.
2. Older design: The CT70 engine is an older design, which means it may not have some of the modern features found in newer engines. This may include things like electronic fuel injection, advanced cooling systems, or better emission control.
3. Availability of parts: While common parts are easy to find, some newer or harder-to-find parts may be more difficult to locate. This could potentially lead to longer wait times or higher prices for repairs.
Conclusion:The Honda CT70 1981 engine (Honda 11100-086-701) is a reliable, affordable, and easy-to-repair option for those looking for a simple and durable engine. However, its limited power and older design may be a drawback for some. If you're looking for a high-performance engine, you may want to consider other options. But if you're looking for a reliable and affordable engine for DIY projects or general use, the CT70 engine is a solid choice.
Recommendation:If you're in the market for a reliable and affordable engine, the Honda CT70 1981 engine (Honda 11100-086-701) is a great option to consider. Its simplicity and ease of repair make it a popular choice for DIY enthusiasts and hobbyists. Just be aware of its limited power and potential difficulty in finding some parts. With proper maintenance, this engine can serve you well for many years to come.
Photo 12 shows some wear at one of the bolt holes. Included is the mounting hardware, oil pump, and timing chain sprocket as seen in photos. These are the OEM matching engine cases from a 1981 Honda CT70 Trail bike. The bolt threads for the foot pegs are good in all four receptacles.
It did not leak oil. The left case has a chip out of it that you can see best in photo 11. They are in good used condition. These are a matching set of original Honda cases from 1981.