Honda CB250/CL250/CB350/CL350 1960s-1970s Shop Manual

Honda CB250/CL250/CB350/CL350 Shop Manual

• Covers 1968 and later Honda CB250, CL250, CB350, and CL350 vertical twin-cylinder motorcycles
• Original OEM publication from Honda Motor Co., Ltd. Service Division
• Includes 219 pages of factory technical specifications, exploded-view diagrams, and maintenance procedures
• File delivered as a direct download the moment payment clears
• Suitable for printing individual sections for shop-floor use
• OCR text layer lets you jump to a torque spec by keyword
• Provides definitive 1960s-era mechanical data for 250cc and 350cc Honda engine tuning and frame assembly
• This official service document serves as the master reference for all CB and CL twin-cylinder variants produced during this era

Engine and Transmission Technical Scope

The 1968 and later Honda CB250/CB350 shop manual details the mechanical architecture of the O.H.C. air-cooled twin-cylinder platform. The content covers engine construction, dismounting, and remounting procedures, alongside specialized chapters on the cam case, cylinder head, and valve mechanism. Every technical section explains the operation of the constant-velocity Keihin carburetor, clutch assembly, and the five-speed transmission system.

The document includes extensive technical data preview sections, such as engine performance curves, dimensional drawings, and special tool reference tables for servicing valves, pistons, and crankcase components. Cylinder head bolt torque values are documented at 60-70 kg-cm, while center bearing cap bolts require 160-210 kg-cm.

Frame and Electrical Specifications

Beyond the engine, this publication documents the chassis and electrical components required for complete vehicle restoration. Frame sections detail the handle, front fork hydraulic dampers, fuel tank maintenance, and braking system service limits. Electrical chapters provide wiring diagrams for various market types, battery charging system characteristics, and ignition circuit values.

Coolant system capacity for standard units is documented at 2 liters, with precise tolerance charts provided for gear shift forks and wheel hub clearance. The 12V-12AH battery system is mapped alongside stator and selenium rectifier testing. All service data shown here is for reference only — qualified technicians and the original OEM documentation remain the authoritative source for any hands-on work. This 219-page official factory manual covers the 1968 and later Honda CB250, CL250, CB350, and CL350, documenting engine, chassis, and electrical specifications for these classic Honda vertical twin-cylinder motorcycle builds.