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SRX 400 Specification

Yamaha SRX 400

The SRX Has 3 different displacement size ; 250, 400 and 600 and SRX400 is the mid class bike in SRX Type. SRX 400 Produced from 1987 to 1990 with 399cc 4-stroke engine SOHC 5-Speed and 87 X 67.2 mm Bore x Stroke.

Yamaha, which had established a single position with the SR400/SR500, continued to pursue the sportiness of the single with the SRX400/SRX600 equipped with a 4-valve engine and opened up new possibilities. It is still popular as a modern single, and it shows its potential even in big single races, when compared to the classic SR series, which is the same single. 

It was a model with a large bosom that could be enjoyed by both novice riders who had just received their license and advanced racers. Before the model change, the cars were known as the SRX-4 and SRX-6, and the SRX-6 had a double disc, a twin shock with a reservoir tank, and an oil cooler, and it was more fulfilling than the SRX-4 at the time of its debut in 1985. I was present. 

The basic concept was kept the same year after year, and it was aged accordingly. The only difference in 1987 was whether or not an oil cooler was present. The engine was the only difference when the model was completely redesigned in 1990. (displacement). Only enthusiasts accepted the early model's kick start, but the late model became a cell start, making it easier for beginners to enjoy. 

The carburetor and ignition method CDI (full transistor) have been changed, despite the fact that the basic parts of the engine have not changed. The oil tank has been moved to the front of the engine and is now equipped with a starter motor, which improves cooling efficiency. The swing arm has been changed to match the frame's thick main tube and high rigidity. 

The rear suspension has been changed to a single monochrome type, and the rear tires have been increased in size to 17 inches and wider. The slightly rounded feel of the previous model adds sharpness to the styling, and the curved surface is beautifully built. 

The short muffler that defines the SRX style is still going strong. The off-road model Artesia used similar engines, and the SRX400 was in production until the second half of the 1990s. The SR400 became the only single model later, but it is one that should not be overlooked as a model that can be easily sports-ridden with a big single.


Yamaha SRX 400 Red Maroon
Yamaha SRX 400

Yamaha SRX400 History

The name "SRX" comes from the 250cc engine. The XT250T engine  was diverted, and it performed admirably in total balance, with moderate power and a light body. The SRX250F is the model with a frame-mounted half cowl (photo). 

A limited edition YSP specification in Italian color was also available. In 1985, it was redesigned as a round light with a meter visor. It was temporarily removed from the lineup, and it was remodeled in 1990 with a similar image to 400 or 600. The wheel is made up of hollow spokes. 

1985 SRX-4 (1JL)

A model with a square pipe frame and a 4-valve big single. The SRX-6 differs in that it comes with an undercarriage and an oil cooler. The YSP specification is a 400cc version with all of the SRX-6's features. In 1987, a 4-pot caliper and a separate gas chamber rear shock were introduced, along with a 17-inch front wheel. The compression ratio was increased and the valve timing was changed in 1988. Radial tires were chosen.

1990 SRX400 (3VN)

The model was updated in the fifth year of its existence, with a significant change in specifications. The name of the vehicle has also been changed from SRX-4 to SRX400. It was converted from two suspensions to a monoshock after being fitted with a starter motor. Engine and frame have been redesigned. On the square pipe frame is a 4-valve engine with dry sump lubrication. Is it true that the tank has a capacity of 14 gallons? (Lit). The SRX series, in contrast to the classic SR series, takes a more modern approach.

Yamaha SRX400 model is quite fancy as a naked street bike, with the cool body shape and feet. Both feet equipped with cool casting wheel and double disc brake on the front and the rear. Front wheel wearing the 110/70-17 tubeless tire and 140/70-17 for the rear. The shockbreaker using telescopic type and the rear using monoshock.

The body works is quite simple as it has naked style, just fuel tank with 15 liters capacity and the rear body under the seat to the tail.

For the Detailed Specs, Here it is the Yamaha SRX400 Specification :

Yamaha SRX400 Specifications

  • Make Model     : Yamaha SRX400
  • Year        : 1987 – 90
  • Engine        : Four stroke, single cylinder, SOHC, 4 valves
  • Capacity    : 399 cc / 24.3 cu-in
  • Bore x Stroke    : 87 67.2 mm
  • Cooling System    : Air cooled
  • Compression Ratio: 9.2:1
  • Induction    : YDIS Twin Carburetor
  • Ignition    : TCI
  • Spark Plug    : DPR8EA-9, IX24B, DPR8EIX
  • Starting    : kick
  • Max Power    : 33 hp / 24.6 kW @ 7000 rpm
  • Max Torque    : 3.4 kgf-m / 24.5 lb-ft @ 6000 rpm
  • Transmission    : 5 Speed
  • Final Drive    : Chain, 428 Heavy Duty O-Ring, 138 links
  • Sprocket Front / Rear: 17 / 50
  • Front Suspension: Telescopic forks
  • Rear Suspension    : Dual shocks
  • Front Brakes    : Single 320mm disc 4 piston caliper
  • Rear Brakes    : Single disc
  • Front Tyre    : 110/70-17 Tubeless
  • Rear Tyre    : 140/70-17 Tubeless
  • Dry Weight    : 147 kg / 324 lbs
  • Fuel Capacity    : 15 Liters / 3.9 US gal

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