CB350/4

CB350F

History

The small Honda FOUR was initially intended to be two models, a 250cc and 350cc model. In the end, it was judged that the performance of a 250 would be disappointing, due to internal friction losses that were beyond the technology of the time, so only the 350cc four was put into production. The CB350/4 proved a suitable entry level machine for the North American market and Europe. In spite of its entry-level focus, the CB350 was luxuriously finished with an upright riding position, four tilted-up silencers and chromium-plated mudguards. When first introduced, it attracted attention as the world’s first four-cylinder production bike of such small capacity, but this curiosity never translated into market appeal and the CB350 was never a big seller.

Serial Numbers

ModelModel YearFrameEngine
CB350 F01972/1973CB350E-1000001CB350F-1000001
CB350 F11974CB350E-2000001CB350F-2000001

Model Guide

CB350F0

The CB350F0 was offered in 1972 and 1973 and was available in two colors, Candy Bacchus Olive and Flake Matador Red with white and orange tank stripes. The side cover emblem, “350 Four”, was painted red and white. Like the other single overhead cam bikes in 1972, the CB350F featured a 4 exhaust pipes and a 5 speed transmission.

CB350F1

Th 1974 CB350F1 was available in one color, Glory Blue Black and featured gold tank stripes. The side cover emblem, “350 Four”, was painted white and orange. The exhaust and mechanicals remained the same.

Specifications

  
Tires 
Front3.00x18in. Bridgestone
Rear3.50x18in. Bridgestone
Brakes 
Front10.25×1.5(x2)in.
Rear6.3×1.2in.
Brake Swept area67.8sq.in.
Specific Brake Loading8.03lb/sqin
Engine 
Typein-line four cylinder, SOHC
Bore and Stroke1.85×1.97in.; 47x50mm
Piston Displacement21.2cu.in.; 347cc
Compression Ratio9.3:1
Valve Clearance, intake0.05mm
Valve Clearance, exhaust0.05mm
Carburetion4; 20mm Keihin
Float Height21mm
IgnitionBattery and coil; breaker points
Contact Point Clearance0.3-0.4mm
Spark PlugD8ea
Capacities 
Fuel Tank3.2gal/12.1 liters
Oil3.2 pints (3.5 liters)
Electrical 
Lighting12v, 156 watts
Battery12v, 12ah
Transmission 
GearRatio
1st20.93
2nd14.18
3rd10.83
4th8.75
5th7.39
Frame 
Wheelbase53.2in.
Seat Height31 1/4in. w/rider
Ground Clearance6.1in w/rider
Curb Weight394lbs., 1/2 tank gas
Test Weight544lbs w/rider
Performance 
Power (crankshaft)32Hp (23.8Kw)
MPH/1000rpm, top gear9.83
0-60mph8.4 seconds
Standing Start 1/4 mile15.61secs.; 81.96mph
Top Speed98mph
Est. Gas Mileage