DUROMAX XP35HPE User manual

XP35HPE HORIZONTAL SHAFT ENGINE
This manual provides information regarding the operation
and maintenance of these products. We have made every
effort to ensure the accuracy of the information in this
manual. We reserve the right to change this product at
any time without prior notice.
5800 Ontario Mills Pkwy
Ontario, CA 91764 USA
www.DuroMaxPower.com
Call our Customer Care Team Toll Free 8-5pm PST Mon-Fri
844-DUROMAX
User Manual
REV: XP35HPE_rev06212021

CONTENTS
1.
Introduction .................................................................................................................... 4
General Safety Procedures ........................................................................................... 6
Package Contents ........................................................................................................... 7
Introduction
2.
Adding Oil ...................................................................................................................... 10
High Altitude.................................................................................................................. 11
Engine Setup
4.
5.
Maintenance Schedule.................................................................................................. 14
Maintenance Log ........................................................................................................... 15
Checking the Oil ............................................................................................................ 16
Changing the Oil............................................................................................................. 17
Cleaning the Air Filter .................................................................................................... 18
Spark Plug Maintenance ............................................................................................... 20
Storage and Transportation ......................................................................................... 22
Specications.................................................................................................................. 23
.......................................................................................................................... 27
Maintenance and Care
Warranty
6. .................................................................................................. 32
Contact Information

INTRODUCTION
Notice Regarding Emissions
DuroMax has cemented its reputation as one of the markets leading power equipment companies
who are headquartered in the US. All of our products are manufactured to the strictest guidelines
and go through countless testing in all phases of production.
Evolving our strong engine line, DuroMax has complemented its oerings to include Pressure
Washers, Water Pumps, Engines and now oering V-Twin engines. Reliability is the highest
standard we hold ourselves to, whether its powering a heater during a winter storm that knocks
out power, dewatering a ooded property, or washing away a deck for the summer season
Engines that are certied to comply with U.S. EPA emission regulations for SORE (Small o Road
Equipment), are certied to operate on regular unleaded gasoline, and may include the following
emission control systems: (EM) Engine Modications and (TWC) Three-Way Catalyst (if so equipped).
4
STOP
Please do not return
to store.
Duromax represntatives are ready to help you with
any questions, concerns, or issues about your new
product. We can guide you through assembly, start
up, and how to operate your new generator. We
want you to be able to put your new generator to
use right away!
CALL US BEFORE YOU CONSIDER
RETURNING THE PRODUCT!
1-800-629-3325
TOLL FREE
Note: Green line is die cut line. Do not print.

SAFETY ALERT SYMBOL
DANGER: This Engine produces poisonous carbon monoxide gas when running. This gas
is both odorless and colorless. Even if you do not see or smell gas, carbon monoxide may
still be present. Breathing this poison can lead to headaches, dizziness, drowsiness, and
eventually death.
●Use outdoors ONLY in non-conned areas.
●Keep several feet of clearance on all sides to allow proper ventilation of the Engine.
WARNING: The exhaust from this product contains chemicals known to the State of
California to cause cancer, birth defects, or other reproductive harm.
WARNING: This Engine produces heat when running. Temperatures near exhaust can
exceed 150°F (65°C).
●Do not touch hot surfaces. Pay attention to warning labels on the Engine
denoting hot parts of the machine.
●Allow Engine to cool several minutes after use before touching engine or areas which
heat during use.
The safety alert symbol is used with one of the safety words (DANGER,
CAUTION, or WARNING) to alert you of hazards. Please pay attention to
these hazard notices both in this manual and on the Engine.
GENERAL SAFETY PROCEDURES
5
Please familiarize yourself with the following safety symbols and words:
●DANGER: Indicates a hazard that will result in serious injury or death if instructions are not
followed.
●WARNING: Indicates a strong possibility of causing serious injury or death if instructions are not
followed.
●CAUTION: Indicates a possibility of personal injury or equipment damage if instructions are not
followed.

WARNING: This Engine may emit highly ammable and explosive gasoline vapors, which
can cause severe burns or even death. A nearby open ame can lead to an explosion
even if not directly in contact with gas.
●Do not operate near an open ame.
●Do not smoke near Engine.
●Always operate on a rm, level surface.
●Always turn Engine o before refueling.
●Allow Engine to cool for at least 2 minutes before removing fuel cap. Loosen cap
slowly to relieve pressure in tank.
●Do not overll gas tank. Gas may expand during operation. Do not ll to the top of
the tank.
●Always check for spilled gas before operating.
●Empty the gasoline tank before storing or transporting the Engine.
●Before transporting, turn fuel valve to the o position and disconnect the spark plug.
GENERAL SAFETY PROCEDURES
6

7
PACKAGE CONTENTS
Your Engine comes with the items listed below. Please check to see that all of the following items
are included with your Engine.
●Note: Actual tools may dier in appearance or design from image shown.
Spark Plug Wrench Oil Funnel
Used in spark plug
maintenance, inspection, and
installation.
Used to add oil to the Engine
without messy spills.

8

ENGINE SETUP
Proper setup of your Engine will get you going as soon as possible while making sure you and your
equipment are safe and cared for.

-20 20 40 60 800 100 F
-30-40 -10 0 10 20 30 -20 40 C
30
10W-30
ENVIRONMENTAL TEMPERATURE
5W-30
SAE
ENGINE SETUP
Add oil
The Engine requires engine oil to operate properly. The Engine, when new from the package
contains no oil in the crankcase*. You must add the proper amount of oil before operating the
Engine for the rst time. This amount is equal to the oil capacity of the engine crankcase:
WARNING: Do not apply engine oils with additives or 2-stroke gasoline engine oils. They don’t
have enough lubrication, and may shorten the engine’s service life.
a. Make sure the Engine is on a level surface.
b. Unscrew the oil ller cap from the engine .
c. Using a funnel, add the appropriate amount of oil
into the crankcase. You can check the oil level of the
Engine with the dipstick located below the oil
ller cap. Simply pull the dipstick out and the
indicated oil level is on the end of the stick.
d. Replace oil ller cap.
1.
Adding Oil
Engine oil recommended: SAE 10W-30. Viscosity varies with
regions and temperatures. Choose your oil viscosity using the
chart to the left.
* A small amount of oil from factory testing may be present on
arrival.
Model Number XP35HPE
Engine Oil Capacity 2.54 qt. (2.4L)
10
WARNING: DO NOT overll the crankcase. This
may damage the motor and shorting overall life
of your Engine.

WARNING: DO NOT overll the crankcase. This
may damage the motor and shorting overall life
of your Engine.
High Altitude Use
11
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 diers from that at which this engine was certied, for
extended periods of time, may increase emissions.
The fuel system on this engine/equipment may be inuenced by operation at higher altitudes.
Proper operation can be ensured by installing an altitude kit when required. See the table below
to determine when an altitude kit is required. Operating this engine/equipment without the
proper altitude kit installed may increase the engine’s emissions and decrease fuel economy
and performance. Kits may be obtained from any dealer, and should be installed by a qualied
individual
.
*This high altitude jet is to be used at elevations above 3000 feet.
**At elevations above 8000 feet, the engine/equipment may experience decreased performance,
even with the high altitude kit.
**If a carburetor is replaced, the proper high altitude kit jet will need to be installed into the
replacement carburetor.
WARNING! To prevent serious injury from re: Follow the kit procedures in a well-
ventilated area away from ignition sources. If the engine is hot from use, shut the engine
o and wait for it to cool before proceeding.
NOTICE: The warranty may be void if necessary adjustments are not made for high altitude use.

MAINTENANCE AND CARE
Proper maintenance and storage of your Engine is essential to ensure trouble free use of your
Engine when you need it.
By following the maintenance and care requirements, you can keep your Engine running smooth
and ecient for years to come.
13

MAINTENANCE AND CARE
Proper routine maintenance of your Engine is essential for safe, economical, and trouble-free
operation. It will also help reduce air pollution.
Maintenance Schedule
Remember that this schedule is based on the assumption that your machine will be used for its
designed purpose. Sustained high-load, high temperature operation, or use in unusually wet or
dusty conditions, will require more frequent service.
WARNING: Improper maintenance, or failure to correct a problem before operation, can
cause a malfunction in which you can be seriously injured or killed. Always follow the
inspection and maintenance recommendations and schedules in this instruction manual.
●Make sure the engine is o before you begin any maintenance or repairs.
●Let the engine and exhaust system cool before touching.
●To reduce the possibility of re or explosion, be careful when working around
gasoline. Use only a nonammable solvent, not gasoline, to clean parts. Keep
cigarettes, sparks, and ames away from all fuel related parts.
SERVICE
REGULAR SERVICE PERIOD
BEFORE
EACH USE
EVERY MO. OR
20 HRS
EVERY 3 MO. OR
50 HRS
EVERY 6 MO. OR
100 HRS
EVERY 12 MO.
OR 300 HRS
ENGINE OIL CHECK
CHANGE
AIR CLEANER CHECK
CHANGE
SPARK PLUG CLEAN-
ADJUST
REPLACE
SPARK ARRESTOR CLEAN
IDLE SPEED CHECK /
ADJUST
VALVE CLEARANCE CHECK-
ADJUST
COMBUSTION
CHAMBER
CLEAN 500 HOURS
FUEL TANK / FILTER CLEAN
FUEL TUBE CHECK EVERY 24 MO. (REPLACE IF NECESSARY)
TO BE PERFORMED AT EVERY MONTH INDICATED OR HOUR INTERVAL WHICH EVER COMES FIRST
14

MAINTENANCE LOG
Date Engine Hours Maintenance Performed
15

MAINTENANCE AND CARE (CONTINUED)
Checking the oil
Check the oil
1.
16
The Engine is equipped with an automatic shuto to protect
it from damage due to low oil. Nonetheless, you should check
the oil level of the engine before each use to ensure that the
engine crankcase has a sucient amount.
To check the oil level:
a. Make sure the Engine is on a level surface.
b. Remove dipstick.
c. With a dry cloth, wipe the oil o of the stick.
d. Insert the dipstick completely back into its hole in
the engine case. the pull it out again. There should
now be oil on the stick. If there is no oil on the stick,
or oil only at the very end of the stick, you should
add oil until the engine crankcase is lled (see
“Adding Oil” portion of the “Maintenance” section).
e. Be sure to replace the dipstick when nished
checking oil.
NOTE: The oil capacity for your Engine can be found in the
“Specications” section of this manual.

Changing the oil
Worn out or dirty oil does not cool the Engine properly and can lead to catastrophic engine
damage.
In addition to regular oil changes, it is necessary to drain the oil from the crankcase if it has
become contaminated with water or dirt.
Remove drain plug
Drain oil
Replace drain plug
Using a 12 mm hex wrench, unscrew the oil drain plug, which
is located on the crankcase underneath the oil ller/dipstick
cap.
Allow all the oil to drain from the Engine.
Drain oil into an approved oil disposal container. Contact
your local auto parts store for information on oil disposal.
Replace the oil drain plug and tighten with a 12 mm hex
wrench.
1.
2.
3.
17

Routine maintenance of the air cleaner helps maintain proper airow to the carburetor. Check
that the air cleaner is free of excessive dirt after every use.
Note: Improper maintenance may cause less air to enter the engine or dirty air to enter the
engine causing overheating and engine wear.
MAINTENANCE AND CARE (CONTINUED)
Cleaning the air lter
Unclip lter cover
Remove lter cover
Remove lter
Unhinge the clasps of the air lter cover. There is one clip on
each side of the cover.
Remove the plastic air lter cover by sliding it out underneath
the Engine’s frame.
Remove the lter from on top of the engine. This lter is
paper and is not reusable. Please call 1-844-DUROMAX to
order a replacement lter for your Engine.
1.
2.
3.
18

19
Replace new lter
Insert the lter, paper side down into the air lter compartment
on top of the engine.
4.
Replace lter cover
Slide the lter cover back in place between the frame and the
engine.
5.
6. Secure lter cover
Fasten the lter cover to the engine with the clips found on
each side of the cover.

The spark plug is important for proper engine operation. A good spark plug should be intact,
free of deposits, and properly gapped. The V-Twin engine in this Engine has two spark plugs,
one on each side. Both plugs are located just underneath the OHV covers.
Improper maintenance may cause reduced fuel economy, misres, trouble starting, or damage
to the spark plug threads.
Spark Plug Maintenance
Remove spark plug cap
Remove spark plug
Inspect spark plug
Pull on the spark plug cap to remove it.
Unscrew the spark plug from the Engine using the spark plug
wrench included with this product.
Visually inspect the spark plug. If it is cracked or chipped,
discard and replace with a new spark plug. We recommend
using a F6RTC spark plug such as NGK BPR5ES.
1.
2.
3.
MAINTENANCE AND CARE (CONTINUED)
20