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Yamaha MX250


The Yamaha MX250 is a motorcycle produced by Yamaha from 1973 to 1975.

1974-Yamaha-MX250A-Yellow-4.jpg
Yamaha MX250
Manufacturer
Production 1973 - 1975
Engine
250
Top Speed 70 mph
Spark Plug NGK B8EG '73-75
Final Drive Chain: 520x104 ‘73-74[1]
Front Sprocket 14T ‘73-74[1]
Rear Sprocket 51T ‘73-74[1]
Front Tire 3.00-21 '73-75
Rear Tire 4.00-18 '73-75
Weight
Recommended Oil Yamalube 10w-40
Related Yamaha MX80
Yamaha MX100
Yamaha MX175
Yamaha MX250
Yamaha MX360
Manuals Service Manual

The year 1972 was a good one for Yamaha, which, in its second season of works participation in motocross Grand Prix, finished second in the 250cc class with Hakan Andersson and fifth in the 500 class with Van Velthoven, while the YZ250 of Gary Jones won the AMA championship.

Contents

Redesigned FramesEdit

Yamaha's great strength is its speed of reaction. The 1973 MX privateer's machine was a genuine replica of the 1972 works machines. The cycle part was completely redesigned, with the engine set lower in a new double cradle frame, while the rear shockers introduced a separate hydraulic fluid tank with external adjustment of the damping. This marked the beginning of a trend towards ever greater sophistication of suspension systems. It was underlined at Yamaha by the introduction of cantilever rear suspension in 1973.

World ChampionEdit

The major revolution in two-stroke engine design, which was to bring automatic intake valves -first on the cylinder, then in the crankcase -and valves in the exhaust, still lay in the future, so the MX250/MX360 Yamahas of 1973 were somewhat lacking in flexibility. Yamaha was world 250cc motocross champion in 1973 with Hakan Andersson, while bikes entered by the French importer Sonauto won the national 125cc championship with Jallat riding and came second in the 500cc class, this time with Drobecq in the saddle.


1973 MX250Edit

 
1973 Yamaha MX 250 in Silver
 
1973 Yamaha MX 250 in Silver
 
1973 Yamaha MX 250 in Silver
 
1973 Yamaha MX 250 in Silver


  • Starting Engine#: 364-000101

1974 MX250AEdit

 
1974 Yamaha MX250A in Yellow
 
1974 Yamaha MX250A in Yellow
 
1974 Yamaha MX250A in Yellow
 
1974 Yamaha MX250A in Yellow
 
1974 Yamaha MX250A in Yellow
 
1974 Yamaha MX250A in Yellow
 
1974 Yamaha MX250A in Yellow
 
1974 Yamaha MX250A in Yellow
 
1974 Yamaha MX250A in Yellow
 
1974 Yamaha MX250A in Yellow
 
1974 Yamaha MX250A in Yellow
 
1974 Yamaha MX250A in Yellow
 
1974 Yamaha MX250A in Yellow
 
1974 Yamaha MX250 in Yellow
 
1974 Yamaha MX250 in Yellow
 
1974 Yamaha MX250 in Yellow
 
1974 Yamaha MX250 in Yellow
 
1974 Yamaha MX250 in Yellow


  • Starting Engine#: 364-020101

1975 MX250BEdit

 
1975 Yamaha MX250B in White
 
1975 Yamaha MX250B in White
 
1975 Yamaha MX250B in White
 
1975 Yamaha MX250B in White


  • Starting Engine#: 509-000101

ReferencesEdit

  1. 1.0 1.1 1.2 2019 Western Power Sports Catalog. Western Power Sports. 2019.