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INTRODUCTION

Thank you for purchasing a Honda powerhead. We want to help

you to get the best results from your new powerhead and to

operate it safely.

This manual contains information on how to do that; please read it

carefully before operating the powerhead. If a problem should arise,

or if you have any questions about your powerhead, consult an

authorized Honda servicing dealer.

All information in this publication is based on the latest product

information available at the time of printing. Honda Motor Co., Ltd.

reserves the right to make changes at any time without notice and

without incurring any obligation. No part of this publication may be

reproduced without written permission.

This manual should be considered a permanent part of the

powerhead and should remain with the powerhead if resold.

We suggest you read the warranty policy to fully understand its

coverage and your responsibilities of ownership. The warranty

policy is a separate document that should have been given to you

by your dealer.

SAFETY MESSAGES

Your safety and the safety of others are very important. We have

provided important safety messages in this manual and on the

powerhead. Please read these messages carefully.

A safety message alerts you to potential hazards that could hurt

you or others. Each safety message is preceded by a safety alert

symbol and one of three words, DANGER, WARNING, or

CAUTION.

Each message tells you what the hazard is, what can happen, and

what you can do to avoid or reduce injury.

DAMAGE PREVENTION MESSAGES

You will also see other important messages that are preceded by

the word NOTICE.

The purpose of these messages is to help prevent damage to your

powerhead, other property, or the environment.

The illustrations in this manual are based on: UMC435

• The illustrations may vary according to the type.

UMC425A∙UMC435A

31VP8600

00X31-VP8-6000

These signal words mean:

You WILL be KILLED or SERIOUSLY

HURT if you don’t follow instructions.

You CAN be KILLED or SERIOUSLY

HURT if you don’t follow instructions.

You CAN be HURT if you don’t follow

instructions.

This word means:

Your powerhead or other property can be damaged if

you don’t follow instructions.

OWNER’S MANUAL

UMC425∙UMC435

POWERHEAD

California Proposition 65

This product contains or emits

chemicals known to the state of

California to cause cancer, birth defects

or other reproductive harm

CONTENTS

The engine exhaust from this product

contains chemicals known to the State of

California to cause cancer, birth defects or

other reproductive harm.

INTRODUCTION.................... 1

SAFETY MESSAGES.............. 1

SAFETY INFORMATION ......... 2

SAFETY LABEL LOCATION..... 4

COMPONENT & CONTROL

LOCATIONS ......................... 4

CONTROLS .......................... 5

BEFORE OPERATION

CHECKS .............................. 6

OPERATION ......................... 9

SAFE OPERATING

PRECAUTIONS................... 9

STARTING THE ENGINE .... 10

SETTING ENGINE SPEED... 11

STOPPING THE ENGINE .... 11

SERVICING YOUR

POWERHEAD...................... 11

THE IMPORTANCE OF

MAINTENANCE................ 11

MAINTENANCE SAFETY ... 11

SAFETY PRECAUTIONS .... 12

MAINTENANCE

SCHEDULE ...................... 12

REFUELING...................... 13

ENGINE OIL ..................... 13

Recommended Oil.......... 13

Oil Level Check ............. 13

Oil Change.................... 14

AIR CLEANER .................. 15

Inspection..................... 15

Cleaning....................... 15

THROTTLE CABLE............ 15

Check and Adjustment ... 15

Free Play Inspection....... 15

SPARK PLUG....................16

COOLING FINS .................17

FUEL FILTER AND FUEL

TANK ..............................17

FUEL TUBE ......................17

SPARK ARRESTER ............18

HELPFUL TIPS &

SUGGESTIONS....................19

STORING YOUR

POWERHEAD ...................19

TRANSPORTING ...............20

TAKING CARE OF

UNEXPECTED PROBLEMS.....21

TECHNICAL & CONSUMER

INFORMATION ....................21

Serial Number Location......21

Carburetor Modifications for

High Altitude Operation .....22

Emission Control System

Information ......................22

Air Index..........................22

Specifications...................23

Tuneup Specifications .......23

Quick Reference

Information ......................23

CONSUMER INFORMATION ...24

Customer Service

Information ......................24

31VP8600.fm Page 1 Friday, May 15, 2015 2:40 PM

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Summary of content (24 pages)

PAGE 1
31VP8600.fm Page 1 Friday, May 15, 2015 2:40 PM INTRODUCTION Thank you for purchasing a Honda powerhead. We want to help you to get the best results from your new powerhead and to operate it safely. This manual contains information on how to do that; please read it carefully before operating the powerhead. If a problem should arise, or if you have any questions about your powerhead, consult an authorized Honda servicing dealer.
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31VP8600.fm Page 2 Friday, May 15, 2015 2:40 PM SAFETY INFORMATION Operator Responsibility • Understand the operation of all controls and learn how to stop the engine quickly in case of an emergency. Make sure the operator receives adequate instruction before operating the equipment. • Do not allow children to operate the powerhead. Keep children and pets away from the area of operation. • Your powerhead’s exhaust contains poisonous carbon monoxide.
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1VP8600.fm Page 3 Friday, May 15, 2015 2:40 PM • Injury caused by vibration and cold: You may feel the prickling or burning pain in your fingers, and the fingers may lose color and feeling. It is believed that these symptoms are brought by vibration and/or exposure to cold. The specific trigger point of these symptoms are not identified yet, but observe the following instructions. * Limit the amount of time you spend operating the powerhead in a day.
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31VP8600.fm Page 4 Friday, May 15, 2015 2:40 PM SAFETY LABEL LOCATION COMPONENT & CONTROL LOCATIONS These labels warn you of potential hazards that can cause serious injury. Read them carefully. If a label comes off or becomes hard to read, contact your Honda servicing dealer for replacement.
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31VP8600.fm Page 5 Friday, May 15, 2015 2:40 PM CONTROLS Starter Grip Engine Switch Pulling the starter grip operates the recoil starter to crank the engine for starting. The engine switch enables and disables the ignition system. The engine switch must be in the ON position for the engine to run. Moving the engine switch to the OFF position stops the engine. OFF STARTER GRIP ON OFF ON ENGINE SWITCH Throttle Trigger The throttle trigger controls engine speed.
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31VP8600.fm Page 6 Friday, May 15, 2015 2:40 PM BEFORE OPERATION CHECKS Joint The joint is to attach a Honda approved attachment to the IS YOUR POWERHEAD READY TO GO? powerhead. Refer to Pages 7–8 for how to attach and detach the attachments. For your safety, to ensure compliance with environmental regulations, and to maximize the service life of your equipment, it is very important to take a few moments before you operate the powerhead to check its condition.
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31VP8600.fm Page 7 Friday, May 15, 2015 For both shoulders (UMC435) 2:40 PM 3. Insert the latch tongue in the slot of the quick-release latch to reattach the powerhead to the carrying harness. For single shoulders (UMC425) CARRYING HARNESS QUICK-RELEASE LATCH TAB CARRYING HARNESS QUICK-RELEASE LATCH LATCH TONGUE SLOT HOOK CARRYING HARNESS LATCH HIP PAD HIP PAD HIP PAD If the latch is not released, have your device inspected and repaired 2.
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31VP8600.fm Page 8 Friday, May 15, 2015 2:40 PM 3. Insert the attachment until the set pin knob clicks. Confirm the “ ” mark on the attachment is at the joint holder end. 3. Hold the main pipe on the powerhead side and detach the attachment. POWERHEAD SIDE SET PIN KNOB MAIN PIPE JOINT HOLDER ATTACHMENT ATTACHMENT 4. Pull the attachment and joint holder to the arrow direction to check that the attachment will not come loose. 4. Turn the set pin knob to the lock position. 5.
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31VP8600.fm Page 9 Friday, May 15, 2015 2:40 PM OPERATION Check All Bolts and Nuts 1. Check each bolt and nut for looseness. Tighten them securely if SAFE OPERATING PRECAUTIONS necessary. Before operating the powerhead for the first time, please review 2. Check the handle for loose mounting bolts, and tighten them the SAFETY INFORMATION (see pages 2–3) and the BEFORE securely if necessary. OPERATION CHECKS (see pages 6–9).
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31VP8600.fm Page 10 Friday, May 15, 2015 2:40 PM STARTING THE ENGINE 3. To start a cold engine, press the priming pump several times until a flow in the fuel return tube (transparent tube) is visually noticed. Exhaust contains poisonous carbon monoxide gas that can build up to dangerous levels in closed areas. Breathing carbon monoxide can cause unconsciousness or death. Never run the powerhead in a closed, or even partially closed area where people may be present.
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31VP8600.fm Page 11 Friday, May 15, 2015 2:40 PM IMPORTANT SAFETY PRECAUTION SERVICING YOUR POWERHEAD Turn the engine switch to the OFF position before performing the following procedure. This will prevent the engine from starting and THE IMPORTANCE OF MAINTENANCE running at maximum speed when the throttle trigger is in the FAST Good maintenance is essential for safe, economical and troublespeed position. If the engine starts with the throttle trigger in the free operation.
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31VP8600.fm Page 12 Friday, May 15, 2015 2:40 PM SAFETY PRECAUTIONS MAINTENANCE SCHEDULE • Make sure the powerhead is off before you begin any maintenance or repairs. To prevent unintentional startup, REGULAR SERVICE PERIOD (1) Perform at every Each disconnect the spark plug cap. This will eliminate several indicated month or use potential hazards: operating hour interval, whichever comes first. – Carbon monoxide poisoning from engine exhaust. ITEM Operate outside, away from open windows or doors.
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31VP8600.fm Page 13 Friday, May 15, 2015 2:40 PM REFUELING Recommended Fuel This engine is certified to operate on unleaded gasoline with a pump octane rating of 86 or higher. To refuel, rest the engine a level surface with the fuel tank cap facing up, as shown. Remove the fuel tank cap, and fill the tank with gasoline to the bottom of the filler neck. Refuel carefully to avoid spilling fuel. Do not overfill. There should be no fuel in the filler neck.
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31VP8600.fm Page 14 Friday, May 15, 2015 2:40 PM 3. Reinstall the engine oil filler cap and tighten securely. OIL FILLER NECK 4. With the powerhead in a level position, fill to the bottom edge of the oil fill hole with the recommended oil (see page 13). Some oil will remain in the powerhead after draining. When refilling with fresh oil, start with UMC425: 2.7 oz (0.08 L), UMC435: 3.3 oz (0.10 L). Slowly add enough oil to fill to the bottom edge of the oil fill hole as shown below. Do not overfill.
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31VP8600.fm Page 15 Friday, May 15, 2015 2:40 PM AIR CLEANER A dirty air cleaner will restrict air flow to the carburetor, reducing engine performance. If you operate the powerhead in very dusty areas, clean the air filter element more often than specified in the MAINTENANCE SCHEDULE. Operating the engine without an air filter element, or with a damaged air filter element, will allow dirt to enter the engine, causing rapid engine wear.
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31VP8600.fm Page 16 Friday, May 15, 2015 2:40 PM 5. Operate the throttle system several times and check if it has 2. Disconnect the spark plug cap, and remove any dirt from free play (i.e. throttle trigger does not move while operating the around the spark plug area. throttle trigger interlock). 3. Remove the spark plug with a 5/8-inch spark plug wrench. After adjustment, check the throttle trigger for smooth SPARK PLUG WRENCH operation. Consult your authorized Honda dealer if necessary.
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31VP8600.fm Page 17 Friday, May 15, 2015 2:40 PM COOLING FINS Inspection ENGINE OIL FILLER CAP 1. Loosen the 5 mm socket bolt, then remove the top cover. 2. Inspect the engine cooling fins, and clean out debris if necessary. FUEL FILLER NECK FUEL TANK CAP 3. Pull out the fuel filter with the mechanic’s wire from the fuel filler neck gently. 4. Inspect the fuel filter. If the fuel filter is dirty, wash it gently with non-flammable or high flash point solvent.
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31VP8600.fm Page 18 Friday, May 15, 2015 2:40 PM SPARK ARRESTER The spark arrester must be serviced every 100 hours to keep it functioning as designed. If the engine has been running, the muffler will be hot. Allow it to cool before servicing the spark arrester. Spark Arrester Removal 1. Loosen the 5 mm socket bolt, then remove the top cover. Spark Arrester Cleaning & Inspection 1. Use a brush to remove carbon deposits from the spark arrester screen. Be careful to avoid damaging the screen.
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31VP8600.fm Page 19 Friday, May 15, 2015 2:40 PM HELPFUL TIPS & SUGGESTIONS Short Term Storage (30–90 days) Adding a Gasoline Stabilizer to Extend Fuel Storage Life When adding a gasoline stabilizer, fill the fuel tank with fresh gasoline. If only partially filled, air in the tank will promote fuel Storage Preparation deterioration during storage.
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31VP8600.fm Page 20 Friday, May 15, 2015 2:40 PM 4. Tip the powerhead toward the fuel filler neck again to drain the TRANSPORTING fuel. If the engine has been running, allow it to cool for at least 15 minutes before loading the powerhead on the transport vehicle. A 5. After all fuel has drained, reinstall the fuel tank cap securely. hot engine and exhaust system can burn you and can ignite some materials. Engine Oil 1. Change the engine oil (see page 14). 2. Clean the air cleaner (see page 15). 3.
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31VP8600.fm Page 21 Friday, May 15, 2015 2:40 PM TAKING CARE OF UNEXPECTED PROBLEMS TECHNICAL & CONSUMER INFORMATION ENGINE WILL NOT START TECHNICAL INFORMATION Possible Cause Correction Choke open. Move lever to CLOSED position unless the engine is warm. Engine switch OFF. Turn engine switch to ON position. Out of fuel. Refuel (p. 13). Bad fuel; powerhead stored without treating or draining gasoline, or refueled with bad gasoline. Drain fuel tank and carburetor (p. 19).
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31VP8600.fm Page 22 Friday, May 15, 2015 2:40 PM Carburetor Modifications for High Altitude Operation Problems That May Affect Emissions If you are aware of any of the following symptoms, have your At high altitude, the standard carburetor air-fuel mixture will be too engine inspected and repaired by your servicing dealer. rich. Performance will decrease, and fuel consumption will increase. A very rich mixture will also foul the spark plug and cause • Hard starting or stalling after starting.
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31VP8600.fm Page 23 Friday, May 15, 2015 2:40 PM Specifications MODEL Description code UMC425 HAGT UMC435 HAHT Frame MODEL Handle type Clutch type Overall length Overall width Overall height Dry mass (weight) UMC425 UMC435 Loop Centrifugal clutch 44.7 in (1,135 mm) 45.1 in (1,145 mm) 12.4 in (315 mm) 12.6 in (320 mm) 9.6 in (245 mm) 10.0 in (255 mm) 11.2 lbs (5.1 kg) 13.2 lbs (6.
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31VP8600.fm Page 24 Friday, May 15, 2015 2:40 PM CONSUMER INFORMATION Customer Service Information Dealer Locator Information Honda Power Equipment dealership personnel are trained professionals. They should be able to answer any question you may have. If you encounter a problem that your dealer does not solve to your satisfaction, please discuss it with the dealership’s management. The Service Manager or General Manager can help. Almost all problems are solved in this way.