Honda CB250, CL250, CB350, CL350, SL350 Shop Manual (P/N 235802)

• Details the 1972 Honda CB250, CL250, CB350, CL350, and SL350 motorcycles, encompassing the K4 and K2 performance variants.
• Serves as a comprehensive reference for descriptive repair data, diagnostics, and component breakdowns.
• Official OEM publication (Part number 235802), printed in Japan by Honda Motor Co., Ltd.
• Features 136 pages of technical specifications, 6 model-specific wiring diagrams, and extensive exploded-view assemblies.
• Acts as the definitive reference for the O.H.C. twin-cylinder engine architecture used throughout the 250cc and 350cc lineups.

Internal Mechanics and Chassis Documentation

This official Honda publication outlines the core inspection, disassembly, and assembly parameters for the engine, frame, and electrical systems. It provides mechanics with an in-depth look at the internal components necessary to understand the system architecture. Detailed chapters break down the valve mechanism, pistons, cylinders, and cam chain tensioner. You will also find thorough documentation on the lubrication system and its centrifugal oil filter. To support daily workshop operations and major repair projects, the text isolates critical technical specifications. These include exact measurements for bore, stroke, and compression ratios, alongside essential torque values for fasteners like cylinder head bolts. Separate sections detail the constant-mesh 5-speed gearbox, gear shift mechanism, and kick-starter assembly. Working on vintage motorcycles carries inherent physical risks. Always verify foundational stability and follow established mechanical safety protocols before applying these reference figures in a live shop environment.

Technical Preview and Performance Specifications

The chassis section illustrates the semi-double cradle frame, front telescopic fork suspension, and rear fork construction. For precise tuning, technical data tables deliver exact reference benchmarks. These cover main bearing diametrical clearance, piston ring end gaps, and ignition timing. Moving to the electrical architecture, the documentation thoroughly outlines the battery-coil ignition and AC generator characteristics.

Crucial reference figures for the K-series build include:

• Cylinder head bolt torque rated at 180–200 kg-cm (13–14.5 ft-lbs).
• Honda CB250 oil capacity mapped at exactly 2 liters.
• SL350 magneto pick-up resistance values documented for advanced performance troubleshooting.
• Detailed fuel-delivery specifications essential for correct carburetor tuning.