Honda CRF150R 2020 - User Manual

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Black

Pantone 186C

CRF150R/RB

PRINTED IN XXXX

XXXX.2019.XX.L

00X31-KSE-7100

31KSE710

2020

CRF150R/RB

Main Page

Questions and Answers

S
Samuel KimJul 28, 2025
Why is my Honda Motorcycle performance poor at high speed?
- C
  Corey ThompsonJul 28, 2025
  If your Honda Motorcycle is showing poor performance at high speed, first check the fuel level. Other potential causes include a clogged fuel line, fuel fill cap breather tube, fuel filter, or fuel valve. Also, examine the connecting tube and insulator for leaks or damage. The fuel-air mixture may be too lean or too rich, so adjust the pilot screw accordingly. Ensure you are using clean fuel and cleaning the motorcycle frequently enough.
T
tmartinezAug 12, 2025
What to do if my Honda Motorcycle has weak or intermittent spark?
- A
  Alice BerryAug 12, 2025
  If your Honda Motorcycle has a weak or intermittent spark, several components could be at fault. Start by replacing the exciter coil, engine stop button, or direct ignition coil. Inspect and repair any broken or shorted direct ignition coil wires. Ensure that all ignition system wires are securely attached. Other potential issues include a faulty ignition pulse generator, low compression (inspect for worn or damaged cylinder), a worn or damaged piston (replace or repair), a head gasket not sealing (replace head gasket), or a valve stuck open (inspect and repair).

Summary

Important Notices

For Competition Use Only

Motorcycle is for closed-course competition use only and not street legal.

For Experienced Riders, No Passengers

Motorcycle is for operator-only use by experienced riders; no passenger carrying.

A Few Words About Safety

Motorcycle Safety

Important Safety Information

Presents key safety information and recommendations for riding the CRF safely.

Accessories & Modifications

Operating Controls

Operation Component Locations

Before Riding

Are You Ready to Ride?

Is Your Motorcycle Ready to Ride?

Details essential pre-ride checks to ensure the motorcycle is in safe operating condition.

Basic Operating Instructions

Safe Riding Precautions

Starting & Stopping the Engine

Explains procedures for starting and stopping the engine, including warm/cold starts.

How to Stop the Engine

Shifting Gears

Explains the process of shifting gears for smooth acceleration and deceleration.

Break-in Guidelines

Servicing Your Honda

Maintenance Safety

Crucial safety precautions to follow during maintenance to prevent injury.

Maintenance Schedule

Planning regular inspections and services based on mileage or time intervals.

General Competition Maintenance

Specific maintenance practices tailored for competition use and conditions.

Before & After Competition Maintenance

Checks and adjustments to perform between and after competition events.

Fuel System

Engine Oil

Details engine oil recommendations, checking, adding, and changing procedures.

Transmission Oil

Covers transmission oil recommendations, checking, adding, and replacing procedures.

Coolant

Air Cleaner

Throttle

Engine Idle Speed

Clutch System

Spark Plug

Valve Clearance

Covers procedures for checking and adjusting valve clearance, including component removal.

Piston;Piston Rings;Piston Pin

Details inspection, removal, and installation procedures for piston, rings, and pin.

Suspension

Covers inspection and maintenance of front and rear suspension components, including fork oil.

Brakes

Details brake system maintenance, including lever/pedal adjustments, fluid checks, and pad wear.

Wheels

Tires & Tubes

Drive Chain

Covers drive chain inspection, adjustment, lubrication, and replacement procedures.

Exhaust Pipe;Muffler

Adjustments for Competition

Front Suspension Adjustments

Fine-tuning front suspension for competition via oil, damping, and spring adjustments.

Rear Suspension Adjustments

Adjusting rear suspension for rider weight and track conditions via spring pre-load and damping.

Suspension Adjustments for Track Conditions

Recommends suspension adjustments based on track surface conditions like soft, hard, or muddy.

Suspension Adjustment Guidelines

Offers systematic guidelines for adjusting suspension settings in 1/4 turn increments.

Carburetor Adjustments & Tuning Tips

Carburetor Components

Carburetor Circuit Functions

Carburetor Removal

Carburetor Disassembly;Assembly

Carburetor Minor Adjustments

Spark Plug Reading

Explains how to interpret spark plug condition to diagnose engine jetting and performance.

Chassis Adjustments

Rear End

Wheelbase

Gearing

Higher Gearing (less driven sprocket teeth)

Lower Gearing (more driven sprocket teeth)

Tips

Transporting Your Motorcycle

Storing Your Honda

Troubleshooting

Provides a troubleshooting guide for common engine starting and performance issues.

Technical Information

Specifications

Lists detailed technical specifications for the CRF150R and CRF150RB models.

Torque Specifications

Provides a comprehensive list of torque specifications for various fasteners and components.

Competition Logbook

Honda CRF150R 2020 Specifications

General

Engine Type	149cc liquid-cooled single-cylinder four-stroke
Bore x Stroke	66.0mm x 43.7mm
Compression Ratio	11.7:1
Ignition	Solid-state CD with electronic advance
Transmission	5-speed
Final Drive	#420 chain; 15T/50T
Rear Brake	Single 190mm disc
Front Tire	70/100-17
Rear Tire	90/100-14
Wheelbase	49.6 inches
Seat Height	32.8 inches
Fuel Capacity	1.1 gallons
Induction	Keihin 32mm carburetor
Front Suspension	37mm inverted Showa cartridge fork with compression and rebound damping adjustability; 10.8 inches travel
Rear Suspension	Pro-Link Showa single shock with adjustable compression and rebound damping
Front Brake	Single disc