RACE ENGINES Europe

Official agents for the

Yamato Motor Co., Ota, Japan

Yamato-2-colour-logo

RACE ENGINES

Yamato Engine Chronology

It can be argued that country of Japan and their support of Kyotei pari-mutuel outboard boat racing literally saved stock outboard racing. In the mid 1970's new stock outboard motors were few and far between, with the bulk of the engines in use having been built in the mid-50's, it was difficult to generate new interest in the sport.

 

Enter the Yamato Corporation of Japan, and their exportation of the Yamato 80 engine into the United States.  Almost overnight, racers and would be racers could buy a virtually new engine for $400-$500.  The engines were run for about one year on the Japanese Kyotei circuit, sent back to the factory and sold refurbished as surplus around the world.  The result was tthe introduction of the OSY.400 class (C Stock Hydro in the USA) of outboard racing, now the worlds largest motorboat racing category.

 

The Yamato 102 was introduced in the mid 1980's and the current Yamato version, the model 302, arrived about 10 years later.  Today, Yamato 80's, 102's, 302's and even the occasional 202 can be found actively racing throughout the world in some of the most competitive classes.

 

Listed below are photos of the varous engines which illustrate the  progressive evolution of these engines through the years:

2a 3a 3b 4a 2b 1a 1b 5a 5b 6a 6b 7a 7b 8a 8b 9a 9b 4b 10a 10b 11a 11b 3b 4a Model 303 model 304

The experiment with nitrous oxide injection was not a success.

  • Engine Model:

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  • HP output / RPM:

  • Weight (kg):

YAMATO 30

March 1956

Regatta Promotion of Industry

325cc

2

62.0 x 54.0 mm

18.5 hp @ 5500 rpm

33.0

Water-jet conversion Yamato motor.

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YAMATO Y-1

March 1953

Regatta Promotion of Industry

325cc

2

62.0 x 54.0 mm

15 hp @ 5500 rpm

32.0

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YAMATO B-35

September 1956

Kinuta Internal Engine Factory

347cc

2

66.0 x 50.8 mm

20.5 hp @ 6200 rpm

38.0

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YAMATO 60

May 1961

Yamato Engine Corporation

348cc

2

64.0 x 54.0 mm

20.5 hp @ 6000 rpm

36.5

Yamato

Y-1

Yamato

B-35

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Yamato

60

YAMATO 65

April 1965

Yamato Engine Corporation

348cc

2

64.0 x 54.0 mm

22.0 hp @ 6300 rpm

37.5

Yamato

65

Yamato

65-B

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YAMATO 65-B

June 1967

Yamato Engine Corporation

348cc

2

64.0 x 54.0 mm

22 hp @ 6300 rpm

37.0

Yamato

70

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YAMATO 70

December 1970

Yamato Engine Corporation

348cc

2

61.8 x 58.0 mm

28 hp @ 6400 rpm

40.0

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Fuji KB-3

April 1971

Fuji Motorboat Corporation

345cc

2

64.5 x 60.0 mm

30 hp @ 7200 rpm

39.0

Fuji

KB-3

Yamato

80

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Yamato 80

January 1974

World Motorboat Corporation

327.8cc

2

60.0 x 58.0 mm

30 hp @ 7000 rpm

40.0

Yamato

102

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Yamato 102

May 1980

Yamato Engine Corporation

396.9cc

2

66.0 x 58.0 mm

30 hp @ 6400 rpm

40.0

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Yamato 202

October 1985

Yamato Engine Corporation

396.9cc

2

66.0 x 58.0 mm

32 hp @ 6600 rpm

42.5

Yamato

202

Yamato

30

321 cut away 321 exhaust outlet

Yamato

321

The revised exhaust outlet on the model 321