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Table Of Contents

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 Distributor's Limited Warranty (U.S.) /

Distributor's Warranty (CA.) to fully understand its coverage and

your responsibilities of ownership. The Distributor's Limited

Warranty (U.S.) / Distributor's Warranty (CA.) is a separate

document that should have been given to you by your dealer.

If not, you can obtain a copy from your dealer or download from:

U.S.A http://powerequipment.honda.com/support/warranty

Canada http://powerequipment.honda.ca/parts-service/warranty

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/C·UMC435A/C

31VP8603

00X31-VP8-6031

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, other property, or the environment

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

INITIAL POWERHEAD SETUP

.... 4

COMPONENT & CONTROL

LOCATIONS...............................5

POWERHEAD

ATTACHMENTS........................5

CONTROLS................................ 6

BEFORE OPERATION

CHECKS ..................................... 7

OPERATION............................. 10

SAFE OPERATING

PRECAUTIONS ....................10

STARTING THE ENGINE..... 11

SETTING ENGINE SPEED ... 12

STOPPING THE ENGINE.....12

SERVICING YOUR

POWERHEAD ..........................12

THE IMPORTANCE OF

MAINTENANCE ................... 12

MAINTENANCE SAFETY .... 12

SAFETY PRECAUTIONS......13

MAINTENANCE

SCHEDULE...........................13

REFUELING.......................... 14

ENGINE OIL..........................14

Recommended Oil ........... 14

Oil Level Check.................14

Oil Change........................ 15

AIR CLEANER....................... 16

Inspection .........................16

Cleaning............................16

THROTTLE CABLE ...............16

Check and Adjustment ....16

Free Play Inspection.........16

SPARK PLUG .......................17

COOLING FINS ....................18

FUEL FILTER AND FUEL

TANK ....................................18

FUEL TUBE...........................18

SPARK ARRESTER

(applicable types) ................19

HELPFUL TIPS &

SUGGESTIONS .......................20

STORING YOUR

POWERHEAD .......................20

TRANSPORTING..................21

TAKING CARE OF

UNEXPECTED PROBLEMS.....22

TECHNICAL & CONSUMER

INFORMATION........................22

Serial Number Location......22

Carburetor Modifications for

High Altitude Operation......23

Emission Control System

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

Emission Control System

Warranty ..............................24

Specifications ......................25

Tuneup Specifications ........25

Quick Reference

Information ..........................25

CONSUMER INFORMATION... 26

Customer Service

Information (For USA and

Canada) ................................26

31VP86030.fm 1 ページ２０１８年３月６日　火曜日　午後４時２５分

Summary of content (28 pages)

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31VP86030.fm 1 ページ２０１８年３月６日火曜日午後４時２５分 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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31VP86030.fm 2 ページ２０１８年３月６日火曜日午後４時２５分 SAFETY INFORMATION Operator Responsibility * Dust mask We recommend that you wear a dust mask to protect yourself from dust and pollen. HARD HAT • 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.
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1VP86030.fm 3 ページ２０１８年３月６日火曜日午後４時２５分 • 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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31VP86030.fm 4 ページ２０１８年３月６日火曜日 SAFETY LABEL LOCATION 午後４時２５分 INITIAL POWERHEAD SETUP These labels warn you of potential hazards that can cause serious Importance of Proper Assembly injury. Read them carefully. If a label comes off or becomes hard to read, contact your Honda Proper assembly is essential to operator safety and the reliability of the machine. Any error or oversight made by the person servicing dealer for replacement.
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31VP86030.fm Ref. No. 5 ページ２０１８年３月６日 Description 火曜日午後４時２５分 UMC425 UMC435 Qty. (1) Owner’s Manual • • 1 (2) Safety glasses • • 1 (3) Single-strap carrying harness • (4) Double-strap carrying harness COMPONENT & CONTROL LOCATIONS THROTTLE TRIGGER INTERLOCK ENGINE SWITCH 1 • LOOP HANDLE 1 THROTTLE TRIGGER (5) hex wrench • • 1 (6) Spark plug wrench • • 1 MAIN PIPE HANGER SET PIN KNOB Add Engine Oil The powerhead is shipped WITHOUT OIL in the engine.
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31VP86030.fm 6 ページ２０１８年３月６日火曜日午後４時２５分 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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31VP86030.fm 7 ページ２０１８年３月６日火曜日午後４時２５分 Joint BEFORE OPERATION CHECKS The joint is to attach a Honda approved attachment to the powerhead. Refer to Pages 8–9 for how to attach and detach the attachments. IS YOUR POWERHEAD READY TO GO? JOINT 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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31VP86030.fm 8 ページ２０１８年３月６日 For both shoulders (UMC435) 火曜日午後４時２５分 For single shoulders (UMC425) 3. Insert the latch tongue in the slot of the quick-release latch to reattach the powerhead to the carrying harness. QUICK-RELEASE LATCH TAB CARRYING HARNESS 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 2. Adjust the length of the harness as shown in the figures below.
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31VP86030.fm 9 ページ２０１８年３月６日火曜日午後４時２５分 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. Tighten the joint knob.
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31VP86030.fm 10 ページ２０１８年３月６日火曜日午後４時２５分 Check All Bolts and Nuts OPERATION 1. Check each bolt and nut for looseness. Tighten them securely if necessary. SAFE OPERATING PRECAUTIONS 2. Check the handle for loose mounting bolts, and tighten them securely if necessary. Before operating the powerhead for the first time, please review the SAFETY INFORMATION (see pages 2–3) and the BEFORE OPERATION CHECKS (see pages 7–10).
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31VP86030.fm 11 ページ２０１８年３月６日火曜日午後４時２５分 STARTING THE ENGINE Exhaust contains poisonous carbon monoxide gas that can build up to dangerous levels in closed areas. 3. To start a cold engine, press the priming pump several times until the priming pump is filled with fuel. Even if the priming pump is pressed too many times, the extra fuel will return to the fuel tank. If the priming pump is not pressed enough, the engine may not start. Breathing carbon monoxide can cause unconsciousness or death.
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31VP86030.fm 12 ページ２０１８年３月６日火曜日午後４時２５分 SERVICING YOUR POWERHEAD Hot Restart If the engine is operated at higher ambient temperatures, then THE IMPORTANCE OF MAINTENANCE turned off and allowed to sit for a short time, it may not restart on Good maintenance is essential for safe, economical and troublethe first pull. free operation. It will also help reduce pollution.
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31VP86030.fm 13 ページ２０１８年３月６日火曜日午後４時２５分 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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31VP86030.fm 14 ページ２０１８年３月６日火曜日午後４時２５分 REFUELING Recommended Fuel This engine is certified to operate on unleaded gasoline with a pump octane rating of 86 or higher. Refuel in a well ventilated area with the engine stopped. If the engine has been running, allow it to cool first. Never refuel the engine inside a building where gasoline fumes may reach flames or sparks. You may use unleaded gasoline containing no more than 10% ethanol (E10) or 5% methanol by volume.
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31VP86030.fm 15 ページ２０１８年３月６日火曜日午後４時２５分 3. Reinstall the engine oil filler cap and tighten securely. 4. With the powerhead in a level position, fill to the bottom edge of the oil fill hole with the recommended oil (see page 14). OIL FILLER NECK Some oil will remain in the powerhead after draining. When refilling with fresh oil, start with UMC425: 2.7 oz (0.08 L, 2.82 fl Imp oz), UMC435: 3.3 oz (0.10 L, 3.52 fl Imp oz).
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31VP86030.fm 16 ページ２０１８年３月６日火曜日午後４時２５分 AIR CLEANER Clean 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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31VP86030.fm 17 ページ２０１８年３月６日火曜日午後４時２５分 5. Operate the throttle system several times and check if it has free play (i.e. throttle trigger does not move while operating the throttle trigger interlock). 2. Disconnect the spark plug cap, and remove any dirt from around the spark plug area. 3. Remove the spark plug with a 5/8-inch spark plug wrench. After adjustment, check the throttle trigger for smooth operation. Consult your authorized Honda dealer if necessary.
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31VP86030.fm 18 ページ２０１８年３月６日火曜日午後４時２５分 COOLING FINS Inspection ENGINE OIL FILLER CAP 1. Loosen the 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. If the fuel filter is excessively dirty, replace it.
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31VP86030.fm 19 ページ２０１８年３月６日火曜日午後４時２５分 SPARK ARRESTER (applicable types) 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 Cleaning & Inspection 1. Use a brush to remove carbon deposits from the spark arrester screen. Be careful to avoid damaging the screen. The spark arrester must be free of breaks and holes.
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31VP86030.fm 20 ページ２０１８年３月６日火曜日午後４時２５分 HELPFUL TIPS & SUGGESTIONS Short Term Storage (30–90 days) STORING YOUR POWERHEAD 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 deterioration during storage. If you keep a container of gasoline for refueling, be sure that it contains only fresh gasoline.
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31VP86030.fm 21 ページ２０１８年３月６日火曜日午後４時２５分 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 15). 2. Clean the air cleaner (see page 16). 3.
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31VP86030.fm 22 ページ２０１８年３月６日火曜日午後４時２５分 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. 14). Bad fuel; powerhead stored without treating or draining gasoline, or refueled with bad gasoline. Drain fuel tank and carburetor (p. 20).
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31VP86030.fm 23 ページ２０１８年３月６日火曜日午後４時２５分 Carburetor Modifications for High Altitude Operation At high altitude, the standard carburetor air-fuel mixture will be too rich. Performance will decrease, and fuel consumption will increase. A very rich mixture will also foul the spark plug and cause hard starting. Operation at an altitude that differs from that at which this engine was certified, for extended periods of time, may increase emissions.
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31VP86030.fm 24 ページ２０１８年３月６日火曜日午後４時２５分 Emission Control System Warranty Your new Honda complies with both the U.S. EPA and State of California emission regulations. American Honda provides the same emission warranty coverage for Honda Power Equipment engines sold in all 50 states. In all areas of the United States, your Honda Power Equipment engine is designed, built, and equipped to meet the U.S. EPA and California Air Resources Board emission standard for spark ignited engines.
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31VP86030.fm 25 ページ２０１８年３月６日火曜日午後４時２５分 Specifications MODEL Description code Type Tuneup Specifications ITEM SPECIFICATION UMC425 HAGT HALT LAAT LACT, LAC1 Spark plug gap 0.024–0.028 in (0.6–0.7 mm) Refer to page: 17 LAAT Idle speed 3,100±200 rpm Valve clearance (cold) IN: 0.08±0.02 mm EX: 0.11±0.02 mm See your authorized Honda dealer Other specifications No other adjustments needed.
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31VP86030.fm 26 ページ２０１８年３月６日火曜日午後４時２５分 CONSUMER INFORMATION Customer Service Information (For USA and Canada) 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.
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