Suzuki RM250 - User Manual

Questions and Answers

M
Mary DavisNov 25, 2025
Why does my Suzuki RM250 run poorly in low speed?
- I
  iwellsNov 25, 2025
  If your Suzuki Motorcycle engine runs poorly at low speeds, possible causes include: * Exhaust valve maladjustment: Adjust the exhaust valve. * Wide spark plug gap: Adjust or replace the spark plug. * Carburetor air screw maladjustment: Adjust the carburetor air screw. * Incorrect carburetor fuel level: Adjust the carburetor fuel level. * Improper jet needle size: Replace the jet needle. * Incorrect ignition timing: Adjust the ignition timing. * CDI unit malfunction: Replace the CDI unit. * Throttle position sensor malfunction: Replace the throttle position sensor. * Ignition coil damage: Replace the ignition coil. * Magneto malfunction: Replace the magneto. * Magneto short circuit: Replace the magneto. * Exhaust valve breather hose clogged: Clean the exhaust valve...
P
parkerkaylaAug 27, 2025
Why does my Suzuki Motorcycle run poorly in high speed?
- J
  Johnathan NunezAug 27, 2025
  If your Suzuki Motorcycle engine runs poorly at high speeds, check these potential issues: * Narrow spark plug gap: Adjust or replace the spark plug. * Incorrect carburetor fuel level: Adjust the carburetor fuel level. * Incorrect main jet setting: Adjust the main jet setting. * Power jet solenoid malfunction: Replace the power jet solenoid. * Retarded ignition timing: Adjust the ignition timing. * CDI unit malfunction: Replace the CDI unit. * Ignition coil damage: Replace the ignition coil. * Air cleaner element clogged: Clean the air cleaner element. * Magneto short circuit: Replace the magneto. * Exhaust pipe cracked: Replace the exhaust pipe. * Exhaust valve malfunction: Clean, adjust, or replace the exhaust valve. * Piston ring stuck: Replace the piston ring.
S
salazarjessicaAug 28, 2025
How to fix Suzuki RM250 engine speed that doesn't return smoothly?
- V
  valenzuelastephenAug 28, 2025
  If the engine speed of your Suzuki Motorcycle does not return smoothly, it may be due to the engine idle speed being too high. To solve this, adjust the engine idle speed.
J
jillhallAug 29, 2025
What causes the exhaust valve to not work on a Suzuki RM250 Motorcycle?
- R
  Robert WashingtonAug 30, 2025
  If the exhaust valve on your Suzuki Motorcycle isn't working, consider these possible causes: * Carbon deposits on the exhaust valve: Clean the exhaust valve. * Exhaust valve damage: Replace the exhaust valve. * Governor damage: Replace the governor. * Exhaust valve shaft damage: Replace the exhaust valve shaft. * Valve spring damage: Replace the valve spring. * Exhaust valve breather hose clogged: Clean the exhaust valve breather hose.
L
larsonalyssaAug 31, 2025
What causes the spark plug to not ignite on a Suzuki RM250?
- S
  Stacey StoutAug 31, 2025
  If the spark plug on your Suzuki Motorcycle isn't igniting, check for: * Ignition coil malfunction: Replace the ignition coil. * Spark plug malfunction: Replace the spark plug. * Magneto malfunction: Replace the magneto. * CDI unit malfunction: Replace the CDI unit. * Wide spark plug gap: Adjust the spark plug gap. * Engine kill switch malfunction: Repair or replace the engine kill switch.
K
kurtwhiteSep 22, 2025
Why does my Suzuki Motorcycle have poor braking?
- J
  Jose WilliamsSep 22, 2025
  If your Suzuki Motorcycle has poor braking, it could be due to: * Brake pads worn: Replace the brake pads. * Improper air bleeding: Bleed air from the brake lines. * Dirty pads and disc: Clean the pads and disc. * Brake fluid leak: Repair the brake fluid leak.
B
Beth WilliamsSep 16, 2025
Why is the rear suspension soft on my Suzuki RM250 Motorcycle?
- K
  Kurt WilliamsSep 17, 2025
  If the rear suspension on your Suzuki Motorcycle is soft, it may be caused by: * Weakened spring: Replace the spring. * Damping force maladjustment: Adjust the damping force. * Low gas pressure: Replace the gas. * Standard spring too soft: Use optional spring.
K
Kristy HansenSep 18, 2025
Why is the rear suspension hard on my Suzuki RM250?
- K
  Kyle GordonSep 18, 2025
  If the rear suspension on your Suzuki Motorcycle is hard, consider the following: * Damping force maladjustment: Adjust the damping force. * Damper rod distortion: Replace the damper rod. * Rear suspension pivoting portion out of grease: Lubricate the pivoting portion. * Standard spring too hard: Use optional spring.
A
Angela NewmanSep 9, 2025
Why doesn't the gearshift lever return on my Suzuki RM250?
- K
  Kyle GardnerSep 9, 2025
  If the gearshift lever on your Suzuki Motorcycle does not return, it could be caused by: * Weakened gearshift return spring: Replace the gearshift return spring. * Gearshift lever sticking: Repair or replace the gearshift lever.
S
Stephen BaileySep 7, 2025
Why is the transmission not shifting on my Suzuki RM250?
- A
  Antonio BrownSep 7, 2025
  If the transmission on your Suzuki Motorcycle does not shift, it could be due to: * Gearshift cam damage: Replace the gearshift cam. * Gearshift fork distortion: Replace the gearshift fork. * Gearshift pawl wear: Replace the gearshift pawl.

Summary

Foreword

General Considerations for Riding

Helmet and Eye Protection

Essential safety gear for riding, including helmet and eye protection.

Protective Clothing

Importance of wearing proper clothing for abrasion protection and avoiding entanglement.

Pre-Ride Machine Inspection

Instructions to inspect the machine before each use as per 'Periodic Inspection'.

Practice on Level Ground

Advice on finding a safe, flat area to practice riding skills.

Know Your Limits and Ride Safely

Emphasizes riding within skill boundaries and avoiding operation when tired or impaired.

Serial Number Location

Servicing Safety Warnings

Engine Exhaust Hazards

Warning about carbon monoxide poisoning from indoor engine operation.

Fuel Fire Hazards

Caution against smoking and sparks when handling fuel.

Burn Hazards from Hot Components

Warning about hot engine and muffler components causing burns.

Hazardous Fluids Warning

Information on the hazards of brake fluid and engine coolant.

Servicing Precautions and Parts

General Servicing Precautions

Guidelines for replacing parts and working safely with others.

Genuine Suzuki Replacement Parts

Recommendation to use genuine Suzuki parts for quality and performance.

Symbol Marks and Materials

General Information

Location of Parts

Diagrams identifying key parts of the motorcycle.

Fuel and Oil Recommendations

Specifications for gasoline, engine oil, and mixing ratio.

Operating Instructions

Procedures for starting and stopping the engine under various conditions.

Transmission Operation

Explanation of the 5-speed transmission and shifting mechanism.

Break-In (Running-In) Procedure

Guidelines for breaking in a new motorcycle or after engine part replacement.

Periodic Maintenance

Maintenance Schedule and Inspections

Chart detailing maintenance intervals and pre-ride inspection items.

Engine and Drivetrain Maintenance

Procedures for spark plug, air cleaner, transmission oil, drive chain, and clutch.

Cooling System and Fuel System Maintenance

Procedures for engine coolant and fuel system components.

Chassis and Suspension Maintenance

Maintenance for front fork, steering, rear suspension, wheels, and tires.

Lubrication Guidelines

Schedule and procedures for lubricating moving parts.

Troubleshooting

Engine Troubleshooting Guide

Diagnosing and resolving engine-related performance issues.

Chassis Troubleshooting Guide

Diagnosing and resolving chassis and suspension related issues.

Machine Tuning

Carburetor Tuning Procedures

Adjusting carburetor settings for optimal air/fuel mixture.

Front Fork Tuning

Adjusting front fork compression and rebound damping.

Rear Suspension Tuning

Adjusting rear suspension compression, rebound, and pre-load.

Suspension Balance Adjustment

Ensuring proper balance between front and rear suspension.

Engine Removal and Installation

Exterior Parts Removal

Procedure for removing exterior body panels and components.

Engine Dismounting Procedure

Step-by-step guide for removing the engine from the chassis.

Engine Mounting Procedure

Step-by-step guide for installing the engine into the chassis.

Post-Engine Installation Inspection

Checks to perform after the engine has been mounted.

Cylinder, Piston, and Exhaust Valve

Construction and Components

Exploded views of cylinder, piston, and exhaust valve assemblies.

Removal Procedures

Steps for removing cylinder head, cylinder, and piston.

Inspection of Cylinder and Piston

Procedures for inspecting cylinder bore, piston, and rings for wear.

Installation Procedures

Steps for installing piston, rings, cylinder, and cylinder head.

Exhaust Valve Service

Disassembly, inspection, and reassembly of the exhaust valve system.

Clutch System

Clutch Construction and Components

Exploded view of the clutch assembly.

Clutch Plate Service

Procedure for removing and inspecting clutch plates.

Clutch Installation and Adjustment

Steps for installing clutch components and adjusting play.

Clutch Cover and Release Camshaft Service

Procedures for servicing the clutch cover and release camshaft.

Kick Starter System

Kick Starter Construction and Components

Exploded view of the kick starter mechanism.

Kick Starter Removal and Inspection

Steps for removing and inspecting kick starter components.

Kick Starter Reassembly and Inspection

Steps for reassembling and checking the kick starter.

Gearshifting System

Gearshifting Construction and Components

Exploded view of the gearshift mechanism.

Gearshifting Removal and Inspection

Steps for removing and inspecting gearshift components.

Gearshifting Reassembly Procedures

Steps for reassembling the gearshift mechanism.

Transmission and Crankshaft

Construction and Components

Exploded views of crankshaft, crankcase, and transmission.

Engine Bottom Side Removal

Procedure for removing parts from the engine bottom side.

Crankcase Separation

Procedure for separating the crankcase halves.

Transmission and Crankshaft Removal

Steps for removing transmission and crankshaft components.

Component Inspection

Inspection of transmission, crankshaft, bearings, and seals.

Installation and Reassembly

Steps for installing bearings, crankshaft, and transmission components.

Fuel System

Carburetor Service

Carburetor construction, removal, cleaning, inspection, and reassembly.

Carburetor Solenoid Service

Removal, inspection, and reassembly of the carburetor solenoid.

Throttle Position Sensor Service

Inspection and removal of the throttle position sensor.

Reed Valve Service

Reed valve construction, removal, inspection, and reassembly.

Cooling System

Cooling Circuit Inspection

Procedure for inspecting the cooling system pressure.

Radiator Service

Radiator removal, inspection, and installation procedures.

Water Pump Service

Water pump removal, inspection, and reassembly procedures.

Electrical System

Servicing Precautions and Tools

Cautions for servicing electrical components and using testers.

Location of Electrical Components

Diagrams showing the location of key electrical parts.

Magneto Rotor and Stator Service

Construction, removal, and installation of magneto rotor and stator.

Electrical Circuit and Troubleshooting

Wiring diagram and troubleshooting for ignition system issues.

Ignition System Inspection

Measuring peak voltage and resistance of ignition system components.

Front and Rear Wheels

Front Wheel Service

Front wheel construction, removal, inspection, bearing, and disc replacement.

Rear Wheel Service

Rear wheel construction, removal, inspection, and replacement procedures.

Front and Rear Brakes

Brake Pad Replacement

Procedure for replacing front and rear brake pads.

Brake Fluid Service

Procedure for replacing brake fluid and bleeding the system.

Brake Disc Inspection

Measuring brake disc thickness and runout.

Front Brake Service

Front brake construction, caliper, master cylinder, and lever service.

Rear Brake Service

Rear brake construction, caliper, master cylinder, and pedal service.

Front Fork and Steering

Front Fork Service

Front fork construction, removal, disassembly, inspection, and reassembly.

Handlebar Controls Service

Removal and remounting of handlebar controls like levers and grips.

Steering System Service

Steering system construction, removal, inspection, and bearing replacement.

Rear Suspension

Rear Shock Absorber Service

Shock absorber construction, removal, inspection, and oil replacement.

Swingarm Service

Swingarm removal, disassembly, inspection, and bearing replacement.

Rear Suspension Linkage Service

Linkage construction, removal, inspection, and bearing replacement.

Servicing Information

Service Data Tables

Specifications and limits for engine, chassis, wheels, tires, and suspension.

Tightening Torque Specifications

List of all critical torque values for engine and chassis components.

Special Tools Required

Catalog of specialized tools needed for maintenance and repair.

Wiring Diagram

Schematic of the motorcycle's electrical system.

Wire, Cable, and Hose Routing

Guides for proper routing of wires, cables, and hoses.

Handlebar and Muffler Set-up

Procedures for setting up handlebars and muffler.

Vehicle Specifications

Detailed technical specifications for engine, transmission, and chassis.

Spare and Optional Parts

Lists of available spare and optional parts with part numbers.

Setting Data Log

Template for recording tuning and setting data for races or conditions.

Suzuki RM250 Specifications

General

Displacement	249cc
Compression Ratio	8.6:1
Front Tire	80/100-21
Rear Tire	110/90-19
Engine Type	2-stroke, liquid-cooled, single-cylinder
Bore x Stroke	66.4mm x 72.0mm
Ignition	CDI
Transmission	5-speed, constant mesh
Rear Suspension	oil-damped, adjustable compression and rebound damping
Front Brake	Single disc
Rear Brake	Single disc