1967-1973 Honda CB125, CB175, CL125, CL175 Shop Manual (P/N 6230401)
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Honda Models Covered & Key Technical Specifications
Models: Honda CB125, CB175, CL125, CL175
Sub-models / Variants: CB125K1, CB125K2, CB125K3, CL125K1, CL125K3, CB175K0, CB175K3, CB175K4, CL175K0, CL175K3, CL175K4, General Export Type, U.S.A. Export Type
Model Years: 1967–1973
Serial Numbers: CB125K1 Engine No. 2000011–, Frame No. 2000000–; CB125K2 Engine No. 3000001–, Frame No. 3000001–; CB125K3 Engine No. 4000001–, Frame No. 4000001–; CL125K1 Engine No. 2000001–, Frame No. 2000001–; CL125K3 Engine No. 4000001–, Frame No. 4000001–; CB175 Engine No. 1000001–, Frame No. 1000001–; CB175K3 Engine No. 4000001–, Frame No. 4000001–; CB175K4 Engine No. 5000001–, Frame No. 5000001–; CL175 Engine No. 1000001–, Frame No. 1000001–; CL175K3 Engine No. 4000001–, Frame No. 4000001–; CL175K4 Engine No. 5000001–, Frame No. 5000001–
Technical Data:
- Engine displacement: 124 cc and 174 cc variants
- Engine type: Air-cooled 4-stroke cycle parallel twin
- Transmission: 5-speed constant-mesh
- Lubrication: Forced pressure and wet sump
- Idle speed: 1,200 rpm
- Valve clearance (cold): 0.05 mm (0.0020 in)
Honda Manual Features & Content Preview
- Official Honda Motor Co. publication (Ref: 6230401, issued June 25, 1974) documenting factory build standards for 125cc and 175cc twin-cylinder K-series models
- 161 pages of OEM specifications detailing engine, chassis, electrical systems, and fuel components
- Features 12 high-resolution exploded-view diagrams of engine internals, plus specialized factory tool reference lists
- Maps out comprehensive transmission gear-shifting schematics to reference during complex tear-downs
Documentation Walkthrough
Inside this vintage publication, technicians will find a complete breakdown of the 125cc and 175cc powertrains. It covers everything from basic engine removal to intricate cylinder head construction and cam chain tensioner adjustments. Working on the gearbox? The documentation maps out the internal mechanisms of the 5-speed transmission, shift drum assembly, and kick-starter. It also breaks down the variable venturi carburetors equipped across both displacement classes.
Beyond the engine, the text outlines the structural integrity of the frame. You get specific data on the telescoping front forks, swing arm suspension, and braking components. Electrical diagnosis is supported by wiring diagrams for both US and general export models. These schematics isolate the ignition circuit, battery charging system, and A.C. generator output, saving valuable diagnostic time at the bench. Please be aware that handling vintage electrical and fuel systems involves inherent fire and shock risks; adhering strictly to professional shop safety protocols is essential before inspecting or modifying these components.
Specification Highlights
Getting the tolerances right is critical for any successful rebuild. This manual provides exact engine assembly torque values alongside wear limits for pistons, connecting rods, and the crankshaft. For instance, cylinder head bolt torque values are strictly set between 180–230 kg-cm (13.0–16.7 ft-lbs).
You will also find the factory baselines for routine servicing. Valve tappet clearance (for both intake and exhaust) requires a precise 0.05 mm gap to ensure optimal reliability. The engine oil capacity is documented at 1.5 liters for the CB/CL175 series. These numbers give mechanics the exact parameters needed to verify internal tolerances and restore factory-level performance.
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