Aoshima’s “The Bike” series now includes the 408cc Honda CB400FOUR! 1/12 scale plastic model kit

Aoshima The Bike 1/12 Honda CB400FOUR ’74… 4,180 yen (tax included) Scheduled for release in October 2025

The photo shows a 1/12 scale plastic model of the 408cc CB400FOUR, which was released in 1974. Every detail has been faithfully recreated in miniature, including the first 4-into-1 muffler on a commercially available vehicle, the sporty rear-mounted footpegs, the pillion footpegs mounted on the swingarm (the 398cc version is fitted with a special stay), and the side covers that are the same color as the gas tank (the 398cc version is black).

It is designed with high-quality specifications, including a seat made of PVC material, metal springs, and laminated assembly cylinder fins.

Product specifications

Brand: AOSHIMA

Specifications: Plastic model

Series: The Bike No. 3

Scale: 1/12

Price: 4,180 yen (including 10% consumption tax)

JAN code: 4905083202388

Publisher: Aoshima Bunka Kyozai Co., Ltd.

<<Note>>

*The photo is a prototype. Specifications may differ from the actual product.

Commonly known as the “Yonfour,” the legendary Honda CB400FOUR

The Honda CB400FOUR was a pioneering model equipped with a 400cc four-cylinder engine, released in December 1974. The CB400FOUR, which featured a beautiful combined muffler, was also known as the “Yonfour” and is still loved by many enthusiasts as a legendary model.

The engine was an air-cooled, 4-stroke, SOHC, in-line 4-cylinder, 408cc. In 1975 (Showa 50), the year after its release, the driver’s license system was revised, and motorcycle licenses were classified into small-sized licenses under 125cc, medium-sized licenses under 400cc, and non-restricted licenses for over 400cc.

Accordingly, in 1976, the 398cc models “CB400FOUR-I (sporty flat handle version)” and “CB400FOUR-II (raised handle version)” were released as domestic models.

The 398cc model has the same bore diameter (51.0mm), but the stroke has been shortened from 50.0mm to 48.8mm. The key point is that it is a high-revving short-stroke type that increases engine speed and gains power. As a result, maximum output has been reduced from 37ps/8,500rpm to 36ps/8,500rpm, and maximum torque has been reduced from 3.2kg-m/7,500rpm to 3.1kg-m/7,500rpm.

The left and right side covers, which were the same color as the fuel tank, were blacked out for the 398cc model. The tank color continued to be red, but blue was discontinued and changed to yellow.

This car reigns supreme in the used car market as an ultra-high-value model, with prices of several million yen being the norm. In particular, the early 408cc version is now considered the “4-Four of 4-Fours” and tends to be more respected than the 398cc version.

Main specifications of the Honda CB400FOUR

*Figures in parentheses are for the 398cc version of the FOUR-II.Length

x Width x Height: 2050mm x 705mm x 1040mmWheelbase

: 1490mmSeat

Height: 1355mmDisplacement

: 408cc (398cc)

Engine Type: Air-cooled 4-stroke OHC 8-valve in-line 4-cylinderBore

x Stroke: 51.0mm x 50.0mm (51.0mm x 48.8mm)

Compression Ratio: 9.4:1Maximum

Power: 37ps/8500rpm (36ps/8500rpm)

Maximum Torque: 3.2kg-m/7500rpm (3.1kg-m/7500rpm)

Starting Method: Electric/Kick

StartTransmission: 6-speed (Return Type)

Suspension:

Front – Telescopic,

Rear – SwingarmBrakes

:

Front – Hydraulic Single Disc ,

Rear –

DrumSeats:

2Fuel Tank Capacity: 14L

A 1/12 scale finished model of the Honda CB400FOUR, a 4-stroke, 4-cylinder, 400cc “Yonfour” that could be ridden with a medium-grade license back when the license system changed. This model is faithfully reproduced down to the smallest detail! | Aoshima

Aoshima Bunka Kyozai Co., Ltd. (Aoshima), a company well-known for its plastic models and hobbies, will release the legendary, highly prized vintage model Honda CB400FOUR (398cc version in Light Ruby Red and Parakeet Yellow) that appeared in 1976 (Showa 54) from its 1/12 scale completed motorcycle series under its brand “SKYNET” in May 2025 (planned). Also, the original color of the 408cc version released in 1974 (Showa 49) (Varnish Blue / color pattern only) will be reproduced. REPORT●KITA Hideaki Aoshima Bunka Kyozai Co., Ltd. https://www.aoshima-bk.co.jp/

https://motor-fan.jp/bikes/article/125222

This complete exhaust system for the Honda CB400FOUR is an unprecedented reproduction by SANKEI, the company that developed and manufactured the original parts for the new bike! It’s a masterpiece that has been recognized by the manufacturer, and includes the HONDA logo.

The Honda Dream CB400FOUR is a classic motorcycle that is still loved by many fans today, nicknamed “Yonfour.” A limited edition reproduction of the same motorcycle’s muffler has been made. It has been reproduced by Sankei Giken Kogyo Co., Ltd. (SANKEI), the company that developed and manufactured the original muffler for the new motorcycle, and is now on sale at Uematsu, a store specializing in discontinued motorcycles. As they have permission from Honda to reproduce and sell it, the muffler is engraved with the “HONDA” logo, just like the original original. Of the limited edition of 300, 100 have already been reserved (as of January 30, 2024). The mold produced this time is not a mass-production specification, so there are no plans to increase production. If you want one, hurry! REPORT●KITA Hideaki UEMATSU https://www.uematsu.co.jp/ YouTube – UEMATSU Channel https://www.youtube.com/c/UEMATSUChannel SANKEI Co., Ltd. https://www.sankei-gk.co.jp/ Product orders and inquiries https://www.uematsu.co.jp/pages/cb400f-reproduction-muffler.html

https://motor-fan.jp/bikes/article/99460

The original 750cc Honda Dream CB750FOUR, the early model “K0” | 1/12 scale reproduction [AOSHIMA]

AOSHIMA (Aoshima Bunka Kyozai Co., Ltd.), well-known for its plastic models, miniature cars, radio-controlled cars, capsule toys, and more, has released a 1/12 scale plastic model that faithfully and precisely reproduces the early “sand cast crankcase model” of the “K0,” the most respected of the Honda Dream CB750FOURs. The engine uses a laminated construction to reproduce the thinness of the fins. The rear suspension uses metal springs for realism. The body emblem is reproduced with plated parts, and the quality of each part has been improved. REPORT ● KITA Hideaki Aoshima Bunka Kyozai Co., Ltd. https://www.aoshima-bk.co.jp/

https://motor-fan.jp/bikes/article/99978

A 1/12 scale reproduction of the legendary 750cc Kawasaki Z2 (Z2/750RS) [AOSHIMA]

AOSHIMA (Aoshima Bunka Kyozai Co., Ltd.), well-known for its plastic models, miniature cars, radio-controlled cars, capsule toys, etc., has released a 1/12 scale plastic model of the legendary 750cc, the Kawasaki Z2 (Z2/750RS), which was released in 1973. In addition to genuine parts, it also comes with popular custom parts such as short pipes, cast wheels, and YB handlebars. REPORT ● KITA Hideaki Aoshima Bunka Kyozai Co., Ltd. https://www.aoshima-bk.co.jp/

https://motor-fan.jp/bikes/article/99879