Honda UMC425LAAT Owner's Manual
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Honda UMC425LAAT Owner's Manual

Powerhead
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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 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
of three words, DANGER, WARNING, or CAUTION.
These signal words mean:
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.
This word means:
Your powerhead, other property, or the environment can be
damaged if you don't follow instructions.
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.
©
2024 Honda Motor Co., Ltd. -All Rights Reserved
31VP8608
00X31-VP8-6080
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.
UMC425A/C·UMC435A/C
OWNER'S MANUAL
The engine exhaust from this product contains
chemicals known to the State of California to
cause cancer, birth defects or other reproductive
CONTENTS
INTRODUCTION....................................1
SAFETY MESSAGES..............................1
SAFETY INFORMATION......................2
SAFETY LABEL LOCATION ................4
and one
INITIAL POWERHEAD SETUP ...............4
LOCATIONS............................................5
CONTROLS .............................................6
OPERATION......................................... 10
PRECAUTIONS ............................... 10
STARTING THE ENGINE .............. 11
SETTING ENGINE SPEED............... 12
STOPPING THE ENGINE.............. 12
POWERHEAD...................................... 12
MAINTENANCE ............................. 12
MAINTENANCE SAFETY.............. 12
SAFETY PRECAUTIONS............... 13
SCHEDULE ...................................... 13
REFUELING ..................................... 14
ENGINE OIL..................................... 14
Recommended Oil.................. 14
Oil Level Check......................... 14
Oil Change ................................. 15
AIR CLEANER.................................. 16
Inspection .................................. 16
Cleaning ..................................... 16
UMC425·UMC435
POWERHEAD
harm.
THROTTLE CABLE..........................16
Free Play Inspection................16
SPARK PLUG ...................................17
COOLING FINS ...............................18
TANK .................................................18
FUEL TUBE.......................................18
types) ................................................19
SUGGESTIONS ....................................20
POWERHEAD..................................20
TRANSPORTING.............................21
PROBLEMS ...........................................22
INFORMATION....................................22
Serial Number Location .............22
Information.....................................23
Warranty ..........................................24
Specifications.................................25
Tuneup Specifications ................25
Information.....................................25
CONSUMER INFORMATION...............26
Canada)............................................26
1

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  • Page 1: 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. OWNER’S MANUAL This manual contains information on how to do that; please read it carefully before operating the powerhead.

  • Page 2: Safety Information

    CLOTHES (LONG PANTS) • The powerhead and exhaust become very hot during operation. • Only use Honda approved attachments. If not, injury or accident may LEG PROTECTORS occur. • Read and follow the instructions in the owner’s manual that came with...
  • Page 3 • Injury caused by vibration and cold: Carbon Monoxide Hazard You may feel the prickling or burning pain in your fingers, and the Your powerhead’s exhaust contains poisonous carbon monoxide gas, fingers may lose color and feeling. It is believed that these symptoms which you cannot see or smell.

  • Page 4: Safety Label Location

    Contact the authorized Canadian model only Honda dealer from whom you purchased the powerhead if any of the loose parts shown are not included with your powerhead. French labels come with the powerhead.

  • Page 5: Component & Control Locations

    MUFFLER Please Register Your Powerhead ENGINE OIL FILLER CAP Please take a few minutes and register your purchase with Honda. FUEL RETURN TUBE You can register by completing and mailing the registration card STARTER GRIP provided with the powerhead or going online to FUEL TUBE powerequipment.honda.com and clicking on Product Registration.

  • Page 6: Controls

    CONTROLS Starter Grip Pulling the starter grip operates the recoil starter to crank the engine for Engine Switch starting. The engine switch enables and disables the ignition system. The engine switch must be in the ON position for the engine to run. STARTER GRIP Moving the engine switch to the OFF position stops the engine.

  • Page 7: Before Operation Checks

    Joint BEFORE OPERATION CHECKS The joint is to attach a Honda approved attachment to the powerhead. IS YOUR POWERHEAD READY TO GO? Refer to Pages 8–9 for how to attach and detach the attachments. For your safety, to ensure compliance with environmental regulations,...
  • Page 8 3. Insert the latch tongue in the slot of the quick-release latch to For both shoulders For single shoulders reattach the powerhead to the carrying harness. (UMC435) (UMC425) QUICK-RELEASE LATCH TAB CARRYING CARRYING HARNESS HARNESS QUICK-RELEASE LATCH LATCH TONGUE SLOT HOOK HIP PAD CARRYING...
  • Page 9 3. Hold the main pipe on the powerhead side and detach the 3. Insert the attachment until the set pin knob clicks. Confirm the “ ” attachment. mark on the attachment is at the joint holder end. POWERHEAD SIDE SET PIN KNOB MAIN PIPE JOINT HOLDER ATTACHMENT...

  • Page 10: Operation

    Read and understand the safety instructions on pages 7 to 10 before operating the powerhead. If you notice any abnormal sound, smell, vibration, or other unusual signs, stop the engine immediately and consult your authorized Honda dealer. With the engine idling, hook the powerhead to your carrying harness and hold the powerhead at the correct position.

  • Page 11: Starting The Engine

    STARTING THE ENGINE 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. Exhaust contains poisonous carbon monoxide gas that can If the priming pump is not pressed enough, the engine may not start.

  • Page 12: Setting Engine Speed

    4. Pull the starter grip 3 to 5 times. professionals and are normally performed by a Honda technician or other qualified mechanic. Follow the STARTING THE ENGINE procedure on page 11 and start the engine with the choke lever in the OPEN position.

  • Page 13: Safety Precautions

    Check powerhead best and is fully equipped to maintain and repair it. Joint knob Check To ensure the best quality and reliability, use only new Honda Genuine Around the joint Check parts or their equivalents for repair and replacement. holder...

  • Page 14: Refueling

    REFUELING 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 Recommended Fuel bottom of the filler neck. Refuel carefully to avoid spilling fuel. Do not overfill.

  • Page 15: Oil Change

    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 Engine oil capacities UMC425: 2.7 oz (0.08 L, 2.82 fl Imp oz) UMC435: 3.3 oz (0.10 L, 3.52 fl Imp oz) Some oil will remain in the powerhead after draining.

  • Page 16: Air Cleaner

    AIR CLEANER Clean Squeeze and dry Dip in oil Squeeze A dirty air cleaner will restrict air flow to the carburetor, reducing engine Do not twist. Do not twist. performance. If you operate the powerhead in very dusty areas, clean the air filter element more often than specified in the MAINTENANCE SCHEDULE.

  • Page 17: Spark Plug

    3. Remove the spark plug with a 5/8-inch spark plug wrench. After adjustment, check the throttle trigger for smooth operation. SPARK PLUG WRENCH Consult your authorized Honda dealer if necessary. THROTTLE TRIGGER INTERLOCK SPARK PLUG 4. Inspect the spark plug.

  • Page 18: Cooling Fins

    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.

  • Page 19: Spark Arrester (Applicable Types)

    SPARK ARRESTER (applicable types) Spark Arrester Cleaning & Inspection The spark arrester must be serviced every 100 hours to keep it functioning as designed. 1. Use a brush to remove carbon deposits from the spark arrester If the engine has been running, the muffler will be hot. Allow it to cool screen.

  • Page 20: Helpful Tips & Suggestions

    HELPFUL TIPS & SUGGESTIONS Short Term Storage (30–90 days) Adding a Gasoline Stabilizer to Extend Fuel Storage Life STORING YOUR POWERHEAD 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 Preparation storage.

  • Page 21: Transporting

    4. Tip the powerhead toward the fuel filler neck again to drain the fuel. TRANSPORTING 5. After all fuel has drained, reinstall the fuel tank cap securely. If the engine has been running, allow it to cool for at least 15 minutes before loading the powerhead on the transport vehicle.

  • Page 22: Taking Care Of Unexpected Problems

    TAKING CARE OF UNEXPECTED PROBLEMS TECHNICAL & CONSUMER INFORMATION ENGINE WILL NOT START TECHNICAL INFORMATION Possible Cause Correction Serial Number Location Choke open. Move lever to CLOSED position unless the engine is warm. Engine switch OFF. Turn engine switch to ON position. Out of fuel.

  • Page 23: Carburetor Modifications For High Altitude Operation

    Honda cannot deny coverage under the emission warranty solely modification is made. for the use of non-Honda replacement parts or service performed at a location other than an authorized Honda dealership; you may use comparable EPA certified parts, and have service performed at non- Honda locations.

  • Page 24: Emission Control System Warranty

    Emission Control System Warranty Your Honda Power Equipment engine is designed, built, and equipped to meet the U.S. EPA, Environment Canada, and California Air Resources Board (models certified for sale in California only) emission standard for spark ignited engines. American Honda Motor provides the emission warranty coverage for engines in the United States and its territories.

  • Page 25: Specifications

    Specifications Tuneup Specifications ITEM SPECIFICATION MAINTENANCE MODEL UMC425 UMC435 Spark plug gap 0.024–0.028 in Refer to page: 17 Description code HAGT HALT HAHT HAMT (0.6–0.7 mm) Type LAAT LAC1, LAC2 LAAT LAC1, LAC2 Idle speed 3,100±200 rpm See your servicing dealer Valve clearance IN: 0.08±0.02 mm...

  • Page 26: Consumer Information

    For Canada: Check with your dealer or visit www.honda.ca and select the Accessories tab under the Powerhead segment to view the range of accessories available for your model.

This manual is also suitable for:

Umc435Umc425Umc435laat

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