Difference between revisions of "Suzuki RM400"

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*[[Suzuki RM465]]
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*[[Suzuki RM500]]
*[[Suzuki RM500]]

Revision as of 20:55, 8 November 2019

'Suzuki RM400'
Also called RM 400
Production 1978
Class [[:Category:Motocross motorcycles|Motocross]] [[Category:Motocross motorcycles]]
Predecessor Suzuki RM370
Air-cooled, Single Cylinder, Two-stroke
Bore / Stroke 80.0mm x 80.0mm
Compression ratio 6.7:1
Horsepower 43.05 HP (32.1 KW) @ 6500RPM
Torque 3.69 ft/lbs (5.0 Nm) @ 6000RPM
Fuel System Mikuni VM36SS Carburetor
Spark Plug NGK B8EGV '80-81
NGK B8EV '79
Transmission Gear box: 5-Speed

Final Drive: Chain

Clutch: Wet, multiplate
Suspension Front: Air/oil-damped, Leading Axle
Rear: Aluminum Box Type, Gas-oil Shocks
Brakes Front: Drum
Rear: Drum
Front Tire 3.00-21-4PR
Rear Tire 4.50-18-4PR
Wheelbase 57.09 inches (1450 mm)
Length 84.29 inches (2141 mm)
Width 34.8 inches (884 mm)
Weight 105.0 kg (wet)
Manuals Service Manual

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The Suzuki RM400 was a Air-cooled, Single Cylinder, Two-stroke Trial motorcycle produced by Suzuki in 1978. Max torque was 3.69 ft/lbs (5.0 Nm) @ 6000 RPM. Claimed horsepower was 43.05 HP (32.1 KW) @ 6500 RPM.


The RM (standing for racing motorcycles) series of Moto-Cross machines were launched in 1975, replacing the old TM models. The range ran from 50cc right up to 400cc, and were very successful off the back of Suzuki’s World championship winning works machinery. By 1981 the models adopted liquid-cooling and the Full Floater swing-arm, a giant evolutionary leap in the handling stakes, giving Suzuki a real edge against the competition at that time. Manufactured from 1978 to 1980, the machine had an air cooled, single cylinder two-stroke engine with a displacement of 402cc and a 6.7:1 compression ratio.


A 80.0mm bore x 80.0mm stroke result in a displacement of just 402.0 cubic centimeters.


The bike has a 5-Speed transmission. Power was moderated via the Wet, multiplate.


It came with a 3.00-21-4PR front tire and a 4.50-18-4PR rear tire. Stopping was achieved via Drum in the front and a Drum in the rear. The front suspension was a Air/oil-damped, Leading Axle while the rear was equipped with a Aluminum Box Type, Gas-oil Shocks. The wheelbase was 57.09 inches (1450 mm) long.

The Suzuki RM400 is a motorcycle produced by Suzuki from 1979 to 1981.

1978 RM400C

1978 Suzuki RM400C

  • FRAME #: RM400-100001
  • ENGINE #: RM400-100009
  • ENGINE TYPE: ... 402cc Two-stroke
  • MODEL CODE: ... 412
  • COLOR: Yellow
  • Aluminum swing arm
  • Gas reservoir shocks
  • Rear brake activated by cable
RM400C 1978

1979 RM400N

  • FRAME #: RM400-105660
  • ENGINE #: RM400-105681
  • ENGINE TYPE: 402cc Two-stroke
  • MODEL CODE: 404
  • COLOR: Yellow
  • Rear brake activated by rod
  • Three tone blue tank and side covers stripes

1980 RM400T

1980 Suzuki RM400T

1980 Suzuki RM400T

  • FRAME #: RM400-109717
  • ENGINE #: RM400-109785
  • ENGINE TYPE: 417cc Two-stroke
  • MODEL CODE: 404
  • COLOR: Yellow
  • Three tone blue tank stripes below black outlined Suzuki

1978 - 1980 Suzuki RM400

1978 - 1980 Suzuki RM400 1978 - 1980 Suzuki RM400 1978 - 1980 Suzuki RM400 1978 - 1980 Suzuki RM400

In Media

See Also