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Honda CB250K3 User Manual

Honda CB250K3
179 pages
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Table of Contents

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Honda CB250K3 Specifications

General IconGeneral
Displacement249 cc
Fuel SystemCarburetor
Transmission5-speed
Final DriveChain
Front SuspensionTelescopic fork
Front BrakeSingle disc
Rear BrakeDrum
Front Tire3.00-18
Rear Tire3.50-18
Fuel Capacity12 liters
Engine TypeFour-stroke
Rear SuspensionSwingarm
Height1, 070 mm
Seat Height780 mm
Weight145 kg

Summary

TECHNICAL DATA

DIMENSIONS

Specifications for overall length, width, height, wheelbase, and ground clearance for various models.

FRAME

Details on frame type, suspension, tire size, and brake specifications.

ENGINE

Engine type, cylinder arrangement, bore, stroke, compression, and torque specifications.

DRIVE TRAIN

Specifications for clutch, transmission, gear ratios, and final reduction.

SPECIAL TOOLS

Tool List and Descriptions

Comprehensive list of specialized tools for CB/CL250, 350 models with reference numbers and usage.

MINOR MODEL CHANGE TABLE OFF PRINCIPAL MODIFICATIONS

Model Change Comparison

Comparison of modifications across different models (CB250, CL250, SL350) for various years.

ENGINE

4.1 MAIN FEATURES

Key features of the engine, including camshaft, rocker arms, and valve clearance.

4.2 POWER TRANSMISSION SYSTEM

Details on the power transmission sequence, including clutch, gears, and drive sprocket.

4.3 DISMOUNTING THE ENGINE

Step-by-step instructions for safely removing the engine from the motorcycle frame.

4.4 REMOUNTING THE ENGINE

Instructions for reassembling the engine back onto the motorcycle frame.

VALVE MECHANISM

A. Description

Explanation of the valve mechanism, including camshaft, rocker arms, and valve operation.

B. Disassembly

Procedure for disassembling the valve mechanism components.

C. Inspection

Guidelines for inspecting valve components for wear and proper function.

D. Reassembly

Steps for reassembling the valve mechanism components correctly.

PISTONS AND CYLINDERS

A. Description

Description of pistons and cylinders, including materials and design features.

B. Disassembly

Procedure for disassembling the piston and cylinder assembly.

C. Inspection

Methods for inspecting cylinder bore, piston, and taper.

D. Reassembly

Instructions for reassembling pistons and cylinders.

CAM CHAIN TENSIONER (hydraulic type)

A. Description

Explanation of the hydraulic cam chain tensioner's function and operation.

B. Disassembly

Steps for disassembling the cam chain tensioner assembly.

C. Inspection

Procedure for inspecting the cam chain tensioner for wear or damage.

D. Reassembly

Instructions for reassembling the cam chain tensioner.

LUBRICATION SYSTEM

A. Description

Overview of the pressure-feed lubrication system and its oil circuits.

B. Disassembly

Steps for disassembling the lubrication system components, including the oil pump and clutch.

C. Inspection

Procedures for inspecting the oil filter, crankcase, and oil pump.

D. Reassembly

Instructions for reassembling the lubrication system components.

CLUTCH

A. Description

Explanation of the clutch operation, components, and power transmission.

B. Disassembly

Procedure for disassembling the clutch assembly.

C. Inspection

Methods for inspecting and adjusting clutch components.

D. Reassembly

Steps for reassembling the clutch assembly.

CRANKSHAFT AND CONNECTING RODS

A. Description

Description of the crankshaft and connecting rods, materials, and construction.

B. Disassembly

Procedure for disassembling the crankshaft and connecting rod components.

C. Inspection

Methods for inspecting crankshaft and connecting rod for wear and alignment.

D. Reassembly

Instructions for reassembling the crankshaft and connecting rod.

TRANSMISSION

A. Description

Explanation of the transmission system, including its five-speed constant-mesh design.

B. Disassembly

Procedure for disassembling the transmission components.

C. Inspection

Methods for inspecting transmission components like backlash and gear wear.

D. Reassembly

Instructions for reassembling the transmission components.

GEAR SHIFT MECHANISM

A. Description

Explanation of the gear shift mechanism, including linkage and pedal operation.

B. Disassembly

Procedure for disassembling the gear shift mechanism.

C. Inspection

Methods for inspecting gear shift forks and bore.

D. Reassembly

Instructions for reassembling the gear shift mechanism.

KICK STARTER

A. Description

Description of the kick starter mechanism and its operation.

B. Disassembly

Procedure for disassembling the kick starter assembly.

C. Inspection

Inspection of kick starter components for wear.

D. Reassembly

Instructions for reassembling the kick starter components.

CRANKCASES

A. Description

Description of crankcase materials and construction, including oil flow.

B. Disassembly

Procedure for disassembling the crankcase assembly.

C. Inspection

Inspection of crankcases for damage and oil leaks.

D. Reassembly

Instructions for reassembling the crankcase.

CARBURETOR

A. Description

Description of the CV carburetor, its features, and construction.

B. Disassembly

Procedure for disassembling the carburetor components.

C. Inspection

Inspection of carburetor settings, idle, and throttle adjustments.

FRAME

5.1 HANDLEBAR

Description of the handlebar, its mounting, and design for rider comfort.

5.2 FORK TOP BRIDGE

Description of the fork top bridge and its mounting to the steering stem.

5.3 FRONT CUSHION (Piston type)

Description of the front fork's hydraulic telescopic system and damping action.

5.4 STEERING STEM

Description of the steering stem, its mounting, and function.

FUEL TANK

A. Description

Description of the fuel tank, its mounting, and fuel cap.

B. Disassembly

Procedure for disassembling the fuel tank assembly.

C. Inspection

Inspection of the fuel tank for leaks and damage.

D. Reassembly

Instructions for reassembling the fuel tank assembly.

FRAME BODY

A. Description

Description of the frame body, its semi-cradle, double-cradle construction, and mounting points.

B. Disassembly

Procedure for disassembling the frame body components.

C. Inspection

Inspection of frame welds for cracks or damage.

D. Reassembly

Instructions for reassembling the frame body.

SEAT

A. Description

Description of the seat, its construction, and features for rider comfort.

STANDS AND BRAKE PEDAL

B. Disassembly (Main Stand)

Procedure for disassembling the main stand.

EXHAUST PIPES AND MUFFLERS

A. Description

Description of the dual exhaust system and mufflers.

B. Disassembly

Procedure for disassembling the exhaust pipes and mufflers.

C. Inspection

Inspection of the muffler for damage.

D. Reassembly

Instructions for reassembling the exhaust pipes and mufflers.

AIR CLEANERS

A. Description

Description of the twin air cleaners for each carburetor.

B. Disassembly

Procedure for removing the air cleaner cover and element.

C. Inspection

Inspection of the air cleaner element for dust and damage.

D. Reassembly

Instructions for reassembling the air cleaner components.

REAR FORK AND REAR FENDER

A. Description

Description of the rear fork and fender construction.

B. Disassembly (REAR FORK)

Procedure for disassembling the rear fork assembly.

D. Reassembly [REAR FORK]

Instructions for reassembling the rear fork assembly.

REAR CUSHION

A. Description (De Carbon type)

Description of the De Carbon type rear cushion damper.

B. Operation

Explanation of the rear cushion's operation and damping adjustment.

Description (Double-Tube Valve) CB350G/CL350K5

Description (Double-Tube Valve)

Description of the double-tube rear shock absorber and its damping mechanism.

B. Disassembly

Procedure for disassembling the rear cushion assembly.

C. Inspection

Inspection of the rear cushion spring and damper for wear and leaks.

D. Reassembly

Instructions for reassembling the rear cushion assembly.

FRONT WHEEL

A. Description

Description of the front wheel, its components, and mounting.

B. Tire Recommendation

Recommended tire brands, sizes, and air pressure for the SL350.

C. Assembly

Steps for assembling the front wheel components.

D. Reassembly

Instructions for reassembling the front wheel after maintenance.

Front Wheel (Disc Brake System)

Front Wheel (Disc Brake System)

Detailed procedures for the front wheel assembly, specifically for models with disc brakes.

BRAKE SYSTEM

A. Disassembly of calipers and master cylinder

Procedure for disassembling brake calipers and master cylinder.

B. Inspection of calipers and master cylinder

Procedures for inspecting brake calipers and master cylinder for wear and damage.

C. Assembly of calipers and master cylinder

Steps for assembling the brake calipers and master cylinder.

D. Adjustment of disc brake

Procedure for adjusting the disc brake system after assembly.

REAR WHEEL

A. Description

Description of the rear wheel, its components, and differences from the front wheel.

B. Disassembly

Procedure for disassembling the rear wheel assembly.

C. Inspection

Inspection of rear wheel components like runout, axle bend, and brake drum.

D. Reassembly

Instructions for reassembling the rear wheel components.

ELECTRICAL PARTS

9.1 IGNITION COIL

Description, removal, inspection, and reassembly of the ignition coil.

9.2 SPARK PLUG

Details on spark plug types, inspection, and installation.

9.3 NOISE SUPPRESSOR

Description, removal, inspection, and reinstallation of the noise suppressor.

9.4 GENERATING SYSTEM

Description, disassembly, inspection, and reassembly of the AC generator.

9.5 RECTIFYING SYSTEM

Description, disassembly, inspection, and reassembly of the rectifying system.

9.6 BATTERY

Description, removal, inspection, and charging procedures for the battery.

9.7 STARTING SYSTEM

Description, disassembly, inspection, and reassembly of the starting motor and related components.

SWITCHES

1. Ignition Switch

Description, removal, inspection, and reassembly of the ignition switch.

2. Stoplight Switch

Description, removal, and inspection of the stoplight switch.

3. Starter Button Switch and Lighting Switch

Description, removal, reassembly, and inspection of starter and lighting switches.

4. Turn Signal and Horn Control Switch

Description, disassembly, inspection, and reassembly of turn signal and horn control switches.

5. Neutral Switch

Description, inspection, removal, and reassembly of the neutral switch.

WIRING HARNESS

A. Description

Description of the wiring harness and wire lead colors for identification.

B. Removal

Procedure for removing the wiring harness from the motorcycle.

C. Inspection

Inspection of wiring harness for abrasions, breaks, and secure connections.

D. Reassembly

Instructions for reassembling the wiring harness.

ENGINE (SL350)

GENERAL DESCRIPTION OF THE SL350

General overview of the SL350 engine, including kick mechanism and disassembly.

7.1 DISMOUNTING THE ENGINE

Step-by-step instructions for removing the engine from the SL350 motorcycle.

7.2 REMOUNTING THE ENGINE

Instructions for reassembling the engine back onto the motorcycle frame.

PRIMARY KICK STARTER

A. Disassembly

Procedure for disassembling the primary kick starter components.

B. Inspection

Inspection of kick starter gear teeth and spindle for wear.

C. Reassembly

Instructions for reassembling the kick starter components.

CARBURETOR

A. Specifications

Carburetor specifications for the SL350 model, including jet sizes and float height.

B. Carburetor Circuits

Explanation of carburetor circuits: starting, low-speed, main circuit, and float circuits.

FRAME

8.1 HANDLEBAR

Description of the handlebar design and its mounting on the CL250/350.

8.2 FORK TOP BRIDGE

Description of the fork top bridge and its mounting to the steering stem.

8.3 FRONT CUSHION (Piston valve type)

Description of the front fork's piston valve type suspension system.

4. FRONT FORKS (free valve type)

Disassembly, inspection, and assembly procedures for free valve type front forks.

STEERING STEM

A. Description

Description of the steering stem, its mounting, and function for stability.

B. Disassembly

Procedure for disassembling the steering stem assembly.

C. Inspection

Inspection of the steering stem for bends or damage.

D. Reassembly

Instructions for reassembling the steering stem.

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