Yamaha SRX 400 SOHC - [1985] Review and Comparison including Similar Bikes, Alternative Bikes, Performance Specs and Technical Information.
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Performance Review: Yamaha SRX 400 SOHC - [1985]

Yamaha SRX 400 SOHC - [1985] image

Yamaha SRX 400 SOHC - [1985]

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Yamaha

Figures & Specs Summary:

  • Edition: Yamaha SRX 400 SOHC
  • Year: 1985 | Type: Sport
  • Engine: 399 cc (24.3 ci) 4 Valve
  • Engine Type: Transverse | Cylinders: 1
  • Engine Stroke: Two | Valve Config: SOHC
  • Fuel Delivery: Carburettor
  • Cooling: Air | Fuel Type: Petrol
  • Transmission: 5 speed / Manual
  • Drive: Chain
  • Wet Weight: 0 kgs (0 lbs)
  • Dry Weight: 147 kgs (324 lbs)
  • Power: 33 bhp (24 kW) @ 7000 rpm
  • Torque: 24.5 lb-ft (33.2 Nm) @ 6000 rpm
  • BHP Per Ton: 197.6 bhp
  • Torque Per Ton: 146.7 lb-ft
  • 0-60 mph (96.6 kph): 18.7 secs
  • 0-100 kph (0-62 mph): 19.1 secs
  • Top Speed: 110 mph (177.0 kph)
  • 1/4 Mile (Est.): 0 secs @ 0 mph
  • Frame: Steel
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Yamaha SRX 400 Performance Review.

Introduction:

This edition of the Yamaha SRX 400 SOHC is the 5 speed / Manual version and was first brought out in 1985. This was at around the same time as the introduction of the 1986 Suzuki RH 250 X and the 1986 Suzuki GSX-R 1100 DOHC.This particular Yamaha SRX 400 has a 399cc Air cooled, Two stroke, Transverse Petrol powerplant with 1 cylinders and Carburettor.

Norton Superlight SS - [2020] image

An alternative Transverse engine, Sport style motorbike includes the Norton Superlight SS - [2020]

The 1985 SRX 400 shares its Transverse engine and Sport style configuration with the likes of the 2020 Norton Superlight SS and the 2019 Norton Superlight Twin. Alternatively, if you're looking for other bikes which share the SRX 400's Sport style with a similar size of engine then how about the 1995 Suzuki RGV 250 V-Twin | 1995cc.1994 Suzuki RGV 250 V-Twin | 1994cc.

Power and Torque:

Weighing in at 0 kgs (0 lbs) this makes the Yamaha SRX 400 SOHC in the same weight category as the 2024 Kawasaki Z7 Hybrid or the 2024 Honda CBR 650 R, give or take 50kg.

Honda X-ADV 745 - [2025] image

The 1985 Yamaha SRX 400 shares the same bhp with the Honda X-ADV 745 - [2025]

In terms of power the 399cc 4 valve Transverse 1 cylinder engine produces 33 bhp (24 kW) @ 7000 rpm similar to the 2025 Honda X-ADV 745 [57.8 bhp (43 kW) @ 6750 rpm] or the 2025 Yamaha WR 250 F [36.1 bhp (26 kW) @ 12000 rpm].

The SOHC Two stroke unit throws out torque of 24.5 lb-ft (33.2 Nm) @ 6000 rpm placing it alongside motorbikes of similar performance figures such as the 2025 Suzuki SV 650 ABS [47.2 lb-ft (63.9 Nm) @ 8100 rpm] and the 2025 Honda MSX 125 Grom [7.6 lb-ft (10.4 Nm) @ 5500 rpm].

Power to Weight:

If one combines the weight with power or torque performance for the Yamaha SRX 400 you can get a better idea of it's real world performance.

Honda CX 500 500 cc - [1978] image

The 1978 Honda CX 500 500 cc has similar Bhp Per Ton stats as the 1985 Yamaha SRX 400 SOHC.

The 1985 Yamaha SRX 400 SOHC has a Power to weight ratio of 197.6 bhp per ton and 146.7 lb-ft per ton. Bhp Per Ton figures of the 1985 SRX 400 competing with the 1978 Honda CX 500 500 cc [222.2 bhp\ton] and the 1976 Suzuki GT 380 A [222.2 bhp\ton].


Power to Weight(cont.):

If you agree with the late great Carroll Shelby, then arguably an even better indicator of potential performance is Torque. Factor weight into the equation and you end up with - Torque per ton, with the Yamaha SRX 400 generating around 146.7 lb-ft per ton. If you're curious as to what other motorbikes have as much torque to weight then look no further than the 2016 Honda VT 750 C Shadow Aero ABS [171.6 lb-ft per ton] and the 2020 Honda VT 750 C Shadow Aero ABS [171.6 lb-ft per ton].

Acceleration:

With a 0-60mph time of 18.7 secs or a 0-100km/h (0-62mph) of 19.1 secs, this makes the Yamaha SRX 400 SOHC similar in acceleration to the 1987 Yamaha SRX 400 SOHC (18.7 secs) and the 1985 Suzuki SX 200 R (18.7 secs). This Yamaha SRX 400 SOHC also competes in terms of 0-60 mph and 0-100km/h with the 2018 Honda CB 250 R Neo Sports Cafe (0.0 secs) and the 2020 Norton Superlight SS (0.4 secs).

Norton Commando 961 Cafe Racer - [2010] image

Quarter Mile time is a close race between the 1985 Yamaha SRX 400 SOHC and the 2010 Norton Commando 961 Cafe Racer

When talking about the performance of the 1985 Yamaha SRX 400 SOHC on the drag strip it can reach a quarter mile in an estimated 0 secs @ 0 mph. Bikes with a similar performance down the quarter mile can be found in the 2010 Norton Commando 961 Cafe Racer (0 secs) and the 1986 Honda NS 250 R Rothmans Special Edition (0 secs).

Top Speed:

The 1985 version of the Yamaha SRX 400 SOHC has a maximum speed of 110mph.

Suzuki GSX-R 400 R - [1991] image

Top Speed of the 1985 SRX 400 equals the 1991 Suzuki GSX-R 400 R

If maxing out your bike on the AutoBahn is your thing and you're wondering what's faster at the top end than the 1985 Yamaha SRX 400 SOHC then how about a 1991 Suzuki GSX-R 400 R (121 mph) and the 1990 Suzuki GSX-R 400 R SP II (121 mph).

Related Links:

1985 Yamaha SRX 400 Rivals List.

A Brief History of Yamaha

Bike Comparison


Performance Figures & Specs:

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Edition:

AG

BT 100

CS 200

DT 125

DT 175

DT 200

DT 230

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DT 360

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DT-1

DT-2

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DX 250

FJ

FJ-09

FJR

FZ

FZ 150i

FZ 16

FZ 400

FZ 600

FZ 700

FZ 750

FZ-03

FZ-07

FZ-09

FZ-10

FZ-S

FZ1

FZ6

FZ8

FZR 1000

FZR 250

FZR 400

FZR 600

FZR 750

FZS 1000

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FZX 700

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GTS 1000

GX 250

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IT 125

IT 175

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IT 490

MT-01

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MT-07

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MT-125

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MXT 850

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NMAX

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R5

RD 125

RD 200

RD 250

RD 350

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RD 500

RS 100

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RT-1

RX 350

RZ 125

RZ 250

RZ 350

RZ 500

SDR 200

SR 125

SR 250

SR 400

SR 500

SRV 250

SRX 250

SRX 400

SRX 600

Star Raider

SZR 150

SZR 600

T-150

TDM 850

TDM 900

TDR 125

TDR 250

T�n�r�

Tracer

Tracer 7

Tracer 9

Tracer 900

Tricity 125

Tricity 155

Tricity 300

TRX 850

TT 225

TT 250

TT 350

TT 500

TT 600

TT-R 225

TT-R 250

TW 125

TW 200

TW 225

TX 500

TX 650

TX 750

TZR 125

TZR 250

V-Max

V-Star 250

Vixion

VR 300

WR 125

WR 200

WR 250

WR 400

WR 426

WR 450

XJ 1100

XJ 400

XJ 550

XJ 6

XJ 600

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XJ 700

XJ 750

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XJR 1200

XJR 1300

XJR 400

XMAX 125

XMAX 250

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XP 500

XP 530

XP 560

XS 1100

XS 250

XS 360

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XS 650

XS 750

XS 850

XS1

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XSR 125

XSR 155

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XT 1200

XT 125

XT 200

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XT 250

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XT 400

XT 500

XT 550

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XT 660

XTZ 125

XTZ 250

XTZ 660

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XV 1000

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XV 125

XV 1600

XV 1700

XV 1900

XV 250

XV 400

XV 500

XV 535

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XV 950

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XVS 125

XVS 1300

XVS 250

XVS 400

XVS 650

XVS 950

XVZ 1200

XVZ 1300

XZ 400

XZ 550

YZF-600

YZF-R125

YZF-R15

YZF-R25

YZF-R3

YZF-R7

YZF-R9

YZF1000

YZF750


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Quarter Mile Time
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