Yamato
Engine Chronology
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1953-present |
It can be argued that country
of Japan and their support of Kyotei pari-mutuel outboard boat racing
literally saved outboard racing in North America: 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 one year on the Japanese Kyotei
circuit, sent back to the factory and sold refurbished as surplus into the
US and other countries. The result was two new classes of outboard racing
for APBA; first the PRO class Formula 350 (which eventually evolved into OSY
400) and the Stock Outboard class 20SS.
Later imported to the US, the
Yamato 102 was introduced into the C Stock class in the mid 1980s. The
current Yamato engine, model 302 arrived in the US about ten years later.
Today, Yamato 80s, 102s, 302s and even the occasional 202 can be found actively
racing throughout the US and Canada in some of APBA's most competitive classes.
Listed below are photos of
the engines which pre-dated the Y80. It's fascinating to see the
progressive evolution of these engines through the years:
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Engine Model No. |
Yamato Y-1 type (28 types) |
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Production Year: |
1953 |
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Manufacturer: |
International Regatta Promotion of
Industry Corporation |
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CC Displacement: |
325 cc |
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Number of Cylinders: |
2 |
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Bore x Stroke: |
62.0 x 54.0 mm |
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HP output/RPM: |
15 hp @ 5000 RPM |
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Weight (kg): |
32.0 |
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| Engine Model No. |
Yamato 30 Type |
| Production Year: |
March 1956 |
| Manufacturer: |
International
Regatta Promotion of Industry Corporation |
| CC Displacement:
|
325 cc |
| Number of
Cylinders: |
2 |
| Bore x Stroke: |
62.0 x 54.0 mm |
| HP output/RPM: |
18.5 hp @ 5500 RPM |
| Weight (kg): |
33.0 |
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| Engine Model No. |
Kinuta
B-35 Type |
| Production Year: |
September 1956 |
| Manufacturer: |
Kinuta Internal
Combustion Engine Factory |
| CC Displacement:
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347.5 |
| Number of
Cylinders: |
2 |
| Bore x Stroke: |
66.0 x 50.8 mm |
| HP output/RPM: |
20.5 hp @ 6200 RPM |
| Weight (kg): |
38.0 |
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| Engine Model No. |
Yamato 60 Type |
| Production Year: |
May 1961 |
| Manufacturer: |
Yamato Engine
Corporation |
| CC Displacement:
|
348.0 |
| Number of
Cylinders: |
2 |
| Bore x Stroke: |
64.0 x 54.0 mm |
| HP output/RPM: |
20.5 hp @ 6000 RPM |
| Weight (kg): |
36.5 |
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| Engine Model No. |
Yamato 65 Type |
| Production Year: |
April 1965 |
| Manufacturer: |
Yamato Engine
Corporation |
| CC Displacement:
|
348.0 |
| Number of
Cylinders: |
2 |
| Bore x Stroke: |
64.0 x 54.0 mm |
| HP output/RPM: |
22 hp @ 6300 RPM |
| Weight (kg): |
37.5 |
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| Engine Model No. |
Yamato 65-B Type |
| Production Year: |
June 1967 |
| Manufacturer: |
Yamato Engine
Corporation |
| CC Displacement:
|
348.0 |
| Number of
Cylinders: |
2 |
| Bore x Stroke: |
64.0 x 54.0 mm |
| HP output/RPM: |
22 hp @ 6300 RPM |
| Weight (kg): |
37.0 |
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| Engine Model No. |
Yamato 70 Type |
| Production Year: |
December 1970 |
| Manufacturer: |
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| CC Displacement:
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348.0 |
| Number of
Cylinders: |
2 |
| Bore x Stroke: |
61.8 x 58.0 mm |
| HP output/RPM: |
28 hp @ 6400 RPM |
| Weight (kg): |
40.0 |
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| Engine Model No. |
Fuji KB-3 Type |
| Production Year: |
April 1971 |
| Manufacturer: |
The Fuji Motorboat
Corporation |
| CC Displacement:
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345.0 |
| Number of
Cylinders: |
2 |
| Bore x Stroke: |
60.5 x 60.0 mm |
| HP output/RPM: |
30 hp @ 7200 RPM |
| Weight (kg): |
39.0 |
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| Engine Model No. |
Types of World 80 |
| Production Year: |
January 1974 |
| Manufacturer: |
World Motorboat
Corporation |
| CC Displacement:
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327.8 |
| Number of
Cylinders: |
2 |
| Bore x Stroke: |
60.0 x 58.0 mm |
| HP output/RPM: |
30 hp @ 7000 RPM |
| Weight (kg): |
40.0 |
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| Engine Model No. |
Yamato 102 Type |
| Production Year: |
May 1980 |
| Manufacturer: |
Yamato Engine
Corporation |
| CC Displacement:
|
396.9 |
| Number of
Cylinders: |
2 |
| Bore x Stroke: |
66.0 x 58.0 mm |
| HP output/RPM: |
30 hp @ 6400 RPM |
| Weight (kg): |
40.0 |
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| Engine Model No. |
Yamato 202 Type |
| Production Year: |
October 1985 |
| Manufacturer: |
Yamato Engine
Corporation |
| CC Displacement:
|
396.9 |
| Number of
Cylinders: |
2 |
| Bore x Stroke: |
66.0 x 58.0 mm |
| HP output/RPM: |
32 hp x 6600 RPM |
| Weight (kg): |
42.5 |
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Photos and info on this page used with the
kind permission of Monta at
www.kyo-tei.com.
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