1
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.
2024 Honda Motor Co., Ltd. –All Rights Reserved
UMC425A/C·UMC435A/C
31VP8608
00X31-VP8-6080
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
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
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