The Yamaha RD400 is a two-stroke motorcycle produced by Yamaha Motor Corporation between 1976 and 1979. It was part of Yamaha’s RD series of motorcycles and was known for its high-performance engine and sporty handling. Here are some of the key specifications for the Yamaha RD400:
- Engine: The Yamaha RD400 was powered by a two-stroke, air-cooled, parallel twin engine with a displacement of 399 cc. It had a bore and stroke of 64 mm x 54 mm and was equipped with a six-speed transmission.
- Power: The Yamaha RD400 had a maximum power output of 48 horsepower at 9,000 RPM.
- Suspension: The Yamaha RD400 had a telescopic fork suspension at the front and a pair of hydraulic shocks at the rear.
- Brakes: The Yamaha RD400 was equipped with a single disc brake at the front and a drum brake at the rear.
- Tires: The Yamaha RD400 was fitted with 3.50-18 tires at the front and 3.75-18 tires at the rear.
- Dimensions: The Yamaha RD400 had a wheelbase of 52.4 inches and a seat height of 30.7 inches. It had a dry weight of 335 pounds.
- Performance: The Yamaha RD400 was capable of reaching a top speed of over 120 mph and could accelerate from 0 to 60 mph in around 5 seconds.
Overall, the Yamaha RD400 was a popular and highly regarded motorcycle that was known for its high-performance engine and agile handling. It was an important model in Yamaha’s history and remains a classic motorcycle among collectors and enthusiasts today.
Here is a technical chart for the Yamaha RD400 motorcycle:
- Engine type: Two-stroke, parallel twin
- Displacement: 399 cc
- Bore x stroke: 64 mm x 54 mm
- Compression ratio: 6.9:1
- Maximum power output: 48 horsepower at 9,000 RPM
- Maximum torque: 32 Nm at 7,500 RPM
- Transmission: 6-speed
- Fuel system: Mikuni VM28SC carburetors
- Ignition: CDI
- Starting system: Kick
- Lubrication system: Premix
- Clutch: Wet multiplate
- Frame: Double downtube, steel
- Suspension (front): Telescopic fork
- Suspension (rear): Hydraulic shock absorbers
- Brakes (front): Single disc
- Brakes (rear): Drum
- Tires (front): 3.50-18
- Tires (rear): 3.75-18
- Wheelbase: 52.4 inches
- Seat height: 30.7 inches
- Fuel tank capacity: 2.8 gallons
- Dry weight: 335 pounds
- Top speed: Over 120 mph
I hope this information is helpful. Let me know if you have any other questions.
Maintenance Instructions for RD400
Here are some general maintenance instructions for the Yamaha RD400 motorcycle:
- Check the oil level regularly: The Yamaha RD400 is a two-stroke motorcycle that requires a mix of oil and gasoline to operate. It is important to check the oil level in the engine regularly to ensure that it is at the proper level.
- Change the oil and spark plugs: The Yamaha RD400 should have its oil and spark plugs changed regularly according to the manufacturer’s recommended intervals. This helps to ensure that the engine is running smoothly and efficiently.
- Clean and adjust the carburetors: The Yamaha RD400 is equipped with Mikuni VM28SC carburetors, which should be cleaned and adjusted regularly to ensure that they are functioning properly.
- Check the air filter: The air filter should be checked regularly and replaced if it is dirty or damaged. A clean air filter is important for ensuring that the engine is getting a sufficient supply of clean air.
- Check and adjust the chain: The chain on the Yamaha RD400 should be checked regularly for wear and adjusted if necessary. A properly adjusted chain helps to ensure that the motorcycle is running smoothly and efficiently.
- Check the brakes: The brakes on the Yamaha RD400 should be checked regularly for wear and replaced if necessary. Properly functioning brakes are important for ensuring the safety of the rider.
Overall, the Yamaha RD400 requires regular maintenance in order to keep it running smoothly and efficiently. It is important to follow the manufacturer’s recommended maintenance intervals and to use genuine Yamaha parts when performing repairs or maintenance.
Performance Ideas for RD400
There are several ways to improve the performance of a Yamaha RD400 motorcycle. Here are a few ideas:
- Install an aftermarket exhaust system: One of the most effective ways to improve the performance of the Yamaha RD400 is to install an aftermarket exhaust system. A performance exhaust can help to increase the engine’s power output and improve its fuel efficiency.
- Upgrade the carburetors: Another way to improve the performance of the Yamaha RD400 is to upgrade the carburetors. Higher-performance carburetors can help to increase the flow of fuel and air into the engine, resulting in improved power and acceleration.
- Install a performance air filter: A performance air filter can help to increase the flow of air into the engine, resulting in improved power and acceleration.
- Upgrade the ignition system: An upgraded ignition system, such as an electronic ignition module, can help to improve the performance of the Yamaha RD400 by providing a stronger spark and more consistent ignition timing.
- Install a performance clutch: A performance clutch can help to improve the Yamaha RD400’s acceleration and power output by allowing the engine to transmit more power to the rear wheel.
- Install a performance suspension: Upgrading the suspension can help to improve the handling and stability of the Yamaha RD400, resulting in a more enjoyable and confident riding experience.
Overall, there are many ways to improve the performance of a Yamaha RD400 motorcycle. It is important to carefully consider the specific goals and needs of the rider and choose the appropriate modifications to achieve the desired results.
Carburetor Settings For RD400
The carburetor settings for a Yamaha RD400 motorcycle can have a significant impact on the engine’s performance and fuel efficiency. It is important to set the carburetors correctly to ensure that the engine is running smoothly and efficiently.
The specific carburetor settings for the Yamaha RD400 will depend on the specific model and year of the motorcycle, as well as the altitude and temperature at which it is being operated. The manufacturer’s manual for the Yamaha RD400 should provide specific guidelines for adjusting the carburetors.
In general, the carburetor settings for the Yamaha RD400 may include the following:
- Air/fuel mixture: The air/fuel mixture refers to the ratio of air to fuel that is being supplied to the engine. The mixture should be set correctly to ensure that the engine is running smoothly and efficiently.
- Idle speed: The idle speed refers to the speed at which the engine is running when it is not being accelerated. The idle speed should be set according to the manufacturer’s recommendations.
- Throttle cable adjustment: The throttle cable adjustment determines how quickly the throttle opens and closes. It should be set correctly to ensure that the engine is responding smoothly to changes in throttle position.
- Throttle stop adjustment: The throttle stop adjustment determines the maximum open position of the throttle. It should be set correctly to prevent the engine from over-revving.
Overall, the carburetor settings for the Yamaha RD400 are important for ensuring that the engine is running smoothly and efficiently. It is important to follow the manufacturer’s recommendations and to make any necessary adjustments carefully and incrementally.