Yamaha SR400J, SR400JC SR400 2018 Owner's Manual

Yamaha SR400J, SR400JC SR400 2018 manual cover
Pages 102
Year 2018
Language(s)
English en

Yamaha SR400J, SR400JC SR400 2018 Specification

The Yamaha SR400J, SR400JC, and SR400 2018 models are a testament to Yamaha's commitment to timeless design and reliable performance. These motorcycles feature a classic air-cooled, 4-stroke, single-cylinder SOHC engine with a displacement of 399cc. This engine delivers a maximum power output of 23 horsepower at 6,500 rpm and a peak torque of 27.4 Nm at 3,000 rpm, providing a balanced and responsive riding experience.

The SR400 series is equipped with a constant mesh 5-speed transmission system, ensuring smooth and efficient gear shifts. The fuel system is handled by a Mikuni 34mm constant-velocity carburetor, contributing to the engine's impressive fuel efficiency and performance consistency. The bikes also employ a transistorized coil ignition system, ensuring reliable starts and optimal combustion.

The chassis of the SR400 models is designed for both durability and comfort. The semi-double cradle frame offers a robust structure, while the telescopic front fork and dual rear shock absorbers provide a comfortable and stable ride. The front brake features a 298mm hydraulic disc, paired with a rear drum brake, ensuring effective stopping power.

The SR400 series boasts a retro aesthetic with modern touches, including a classic round headlamp, chrome-plated components, and a comfortable, well-padded seat. The bikes have a dry weight of approximately 174 kg and a fuel tank capacity of 12 liters, making them suitable for both urban commuting and longer rides.

In terms of dimensions, the Yamaha SR400 models measure 2,085mm in length, 750mm in width, and 1,095mm in height, with a wheelbase of 1,405mm. The seat height is set at 785mm, accommodating riders of various heights. Overall, the 2018 Yamaha SR400J, SR400JC, and SR400 combine classic styling with modern engineering, offering a reliable and enjoyable riding experience.

Yamaha SR400J, SR400JC SR400 2018 F.A.Q.

What is the recommended oil type for the Yamaha SR400 2018?

The recommended oil type for the Yamaha SR400 2018 is SAE 10W-40, API service SG or higher.

How often should I change the oil on my Yamaha SR400?

It is recommended to change the oil every 3,000 miles or every 6 months, whichever comes first.

What is the procedure to adjust the chain tension on a Yamaha SR400?

To adjust the chain tension, first loosen the rear axle nut, then adjust the chain adjusters on both sides of the swingarm evenly, ensuring the chain has 20-30mm of slack, and finally, retighten the axle nut.

What is the correct tire pressure for the Yamaha SR400 2018?

The correct tire pressure for the Yamaha SR400 2018 is 29 psi for the front tire and 33 psi for the rear tire.

How do I troubleshoot starting issues on the Yamaha SR400?

If the Yamaha SR400 is experiencing starting issues, check the battery charge, inspect the spark plug for wear or fouling, ensure fuel is reaching the engine, and verify the kill switch is in the 'run' position.

What is the valve clearance specification for the Yamaha SR400?

The valve clearance for the Yamaha SR400 should be set to 0.10 mm for the intake and 0.15 mm for the exhaust when the engine is cold.

How can I maintain the battery life of my Yamaha SR400?

To maintain battery life, regularly check the charge, avoid deep discharges, clean the terminals to prevent corrosion, and consider using a trickle charger if the bike is not used for extended periods.

How do I replace the air filter on the Yamaha SR400?

To replace the air filter, remove the seat and the side cover, then unscrew the air filter box cover, take out the old filter, and insert a new one before reassembling.

What are common reasons for excessive vibration in a Yamaha SR400?

Excessive vibration can be caused by unbalanced tires, loose engine mounts, worn-out suspension components, or an improperly tensioned chain.

How do I properly store my Yamaha SR400 for the winter?

To store your Yamaha SR400 for the winter, clean the bike thoroughly, change the oil, add a fuel stabilizer, disconnect the battery, inflate the tires, and cover the bike with a breathable cover.