DUROMAX DuroStar DS1050 User manual

DS1050 GENERATOR
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: DS1050-04022018

CONTENTS
3
1.
Introduction..................................................................................................................... 6
General Safety Procedures............................................................................................ 7
Quick Start Guide.......................................................................................................... 10
Generator Components............................................................................................... 12
Package Contents ......................................................................................................... 14
Introduction
3.
Check the Gas Level...................................................................................................... 20
Starting the Generator ................................................................................................. 21
Starting the Generator
2.
Adding Gasoline Mix..................................................................................................... 16
Grounding the Generator ............................................................................................ 17
High Altitude Operation ............................................................................................... 17
Generator Setup
4.
AC Usage ........................................................................................................................ 24
Connecting a Load to the Generator.......................................................................... 26
DC Usage........................................................................................................................ 28
Using the Generator

CONTENTS
4
5.
6.
7.
Maintenance Schedule................................................................................................. 32
Maintenance Log .......................................................................................................... 33
Cleaning the Air Cleaner .............................................................................................. 34
Spark Plug Maintenance .............................................................................................. 36
Storage and Transportation ........................................................................................ 38
Specications................................................................................................................. 39
......................................................................................................................... 44
Basic Troubleshooting ................................................................................................. 42
Wiring Diagram ............................................................................................................ 43
Maintenance and Care
Warranty
Troubleshooting
8. .................................................................................................. 48
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).
6
STOP
Please do not return
to store.
Durostar representatives 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!
1-844-DUROMAX
TOLL FREE

SAFETY ALERT SYMBOL
DANGER: This generator 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 generator.
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 generator 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 generator denoting
hot parts of the machine.
●Allow generator 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 generator.
GENERAL SAFETY PROCEDURES
7
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 generator 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 generator.
●Always operate on a rm, level surface.
●Always turn generator o before refueling.
●Allow generator 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 generator.
●Before transporting, turn fuel valve to the o position and disconnect the spark plug.
WARNING: This generator produces a powerful voltage, which can result in electrocution.
●ALWAYS ground the generator before using it (see the “Grounding the Generator”
portion of the “PREPARlNG THE GENERATOR FOR USE section).
●Generator should only be plugged into electrical devices, either directly or with an
extension cord. NEVER connect to a building electrical system without a qualied
electrician. Such connections must comply with local electrical laws and codes. Failure
to comply can create a backow of power, which may result in serious injury or death
to utility workers.
●Use a ground fault circuit interrupter (GFCI) in highly conductive areas such as metal
decking or steel work. GFCls are available in-line with some extension cords.
●Do not use uncovered in rainy or wet conditions.
●Do not touch bare wires or receptacles (outlets).
●Do not allow children or non-qualied persons to operate.
GENERAL SAFETY PROCEDURES
8

In addition to the above safety notices, please familiarize yourself with the safety and
hazard markings on the generator.
GENERAL SAFETY PROCEDURES
9
Exhuast outlet and muffler will
become extremely hot. Do Not Touch.

QUICK START GUIDE
Add gasoline mix
The fuel cap is located on top of the fuel tank. Fill the tank
with fresh unleaded gasoline 87 octane or higher mixed
50:1 with 2-Stroke Oil. The tank is full when you see fuel in
the bottom of the fuel lter cup.
1.
Turn gas valve on
The gas valve is located above the recoil start on the
bottom of the fuel tank. Rotate the valve clockwise to the
vertical position to turn on the gas supply.
2.
10
Close choke
The choke lever is located above the air lter to the left
of the recoil start. Slide the lever to the right to cut the air
supply and allow more gas into the engine to start.
3.
Pull recoil start
Pull the recoil start handle quickly the complete length of the
rope and then let it retract slowly. The unit will generally start
within 3 pulls. CAUTION: DO NOT let go of the handle while
the rope is extended this may cause damage to yourself or
your machine.
5.
Flip engine switch to ON
The engine switch is located on the left side of the front
power panel. Flip the switch to on.
4.

Open choke
The choke lever is located above the air lter to the left of
the recoil start. Slide the lever to the left to open the choke
and increase air into the carburetor for normal running.
6.
Turn breaker on & connect
devices
Connect your devices to the receptacles on the front panel.
Start with the largest loads rst.
7.
11

GENERATOR COMPONENTS
12
2. Choke Lever
1. Air Cleaner
3. Circuit Breaker
5. 110V 3-Prong Recepticle
6. Ground Terminal 4. Engine Switch
1. Air Cleaner - a removable, cleanable, oiled, sponge-like element that cleans the air going into
the engine.
2. Choke Lever - Allows the airow into the carburetor to be restricted to assist in starting the
engine.
3. Circuit Breaker - Resettable switch that protects the generator from electrical overload.
4. Engine Switch – 3 Position Switch to “Start”, “Run”, or turn “O” the generator.
5. 110v 3-Prong Receptacle - Use to connect electrical devices that run 110 Volt, 60 Hz, single
phase, AC current (NEMA 5-20).
6. Ground Terminal - Connect a ground wire here to properly ground the generator.
7. T-Shaped 12VDC - 12v DC Outlet used to charge batteries. *Charging Cable Included
7. T-Shaped 12VDC

8. Fuel Cap
10. Muer
11. Spark Plug
9. Handle
8. Fuel Cap - Allows access to ll the fuel tank.
9. Handle - Easy access handle for convenient transportation.
10. Muer – Reduces engine emissions and reduces nois
11. Spark Plug - Provides ignition spark for the engine.
12. Recoil Start – Easy Pull Recoil Start to start the engine without the electric start.
13. Fuel Valve - On/O Valve that allows fuel into the engine.
13
13. Fuel Valve
12. Recoil Start

PACKAGE CONTENTS
Your generator comes with the items listed below. Please check to see that all of the following
items are included with your generator.
●Note: Actual tools may dier in appearance or design from image shown.
14
Charging Cables
Used to charge Automotive
style 12V Batteries.
Spark Plug Wrench
Used in spark plug
maintenance, inspection, and
installation.

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

WARNING: Gasoline and gas fumes are highly ammable.
●Do not ll tank near an open ame.
●Do not overll. Always check for fuel spills.
16
Step 1 - Adding Gasoline
Add Gasoline Mix
a. Make sure the generator is on a level surface.
b. Unscrew gas cap and set aside (NOTE: the gas cap
may be tight and hard to unscrew).
c. Slowly add unleaded gasoline to the fuel tank. Be
careful not to overll. Please refer to the chart below
to nd the gas capacity of your generator model
d. Replace fuel cap and wipe up any spilled gasoline
with a dry cloth.
NOTE: Gas can expand. Do not ll the gas tank
to the very top. Leave a minimum of 1.5 in of open
space.
IMPORTANT:
●Always use a 50:1 oil/gasoline mixture.
●Never use old gas.
●Avoid getting dirt or water in the fuel tank.
●Gas can age in the tank and make it hard to start up
the generator in the future.
●Never store generator for extended periods of time
with fuel in the tank.
2.
To ensure that the generator runs smoothly use only FRESH, UNLEADED GAS WITH AN OCTANE
RATING OF 87 OR HIGHER mixed 50:1 with 2-Stroke Oil.
Model Number DS1050
Gas Tank Capacity 1.05 US Gallons (4L)
GENERATOR SETUP

Attach grounding wire
a. Ground the generator by tightening the grounding
nut against a grounding wire.
b. Connect the other end to a copper or brass
grounding rod that’s driven into the earth.
A generally acceptable grounding wire is a No. 12 AWG
(American Wire Gauge) stranded copper wire.
Grounding codes can vary by location. Please contact a local
electrician to check the grounding regulations for your area.
1.
Step 2 - Grounding the Generator
WARNING: Failure to properly ground the generator can result in electrocution.
17
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 diers from that at which this engine was certied, for extended periods of
time, may increase emissions. High altitude performance can be improved by specic modications to the
carburetor. If you always operate your generator at altitudes above 5,000 feet (1,500 meters), have a dealer
perform this carburetor modication. This engine, when operated at high altitude with the carburetor
modications for high altitude use, will meet each emission standard throughout its useful life. Even with
carburetor modication, engine horsepower will decrease about 3.5% for each 1,000-foot (300-meter)
increase in altitude. The eect of altitude on horsepower will be greater than this if no carburetor
modication is made.
When the carburetor has been modied for high altitude operation, the air/fuel mixture will be too lean
for low altitude use. Operation at altitudes below 5,000 feet (1,500 meters) with a modied carburetor may
cause the engine to overheat and result in serious engine damage.

19
STARTING THE GENERATOR
If this is not your rst time using the generator there are still steps you should take to prepare it for
operation each time you use it.
IMPORTANT: At this point you should be familiar with the procedures described in the rst
portion of this section entitled “GENERATOR SETUP” If you have not yet read this section, go
back and read it now.

Check Gasoline Mix
a. Make sure the generator is on a level surface.
b. Unscrew gas cap and set aside (NOTE: the gas cap
may be tight and hard to unscrew).
c. Slowly add unleaded gasoline to the fuel tank. Be
careful not to overll.
d. Replace fuel cap and wipe up any spilled gasoline
with a dry cloth.
NOTE: Gas can expand. Do not ll the gas tank
to the very top. Leave a minimum of 1.5 in of open
space.
IMPORTANT:
●Always use a 50:1 oil/gasoline mixture.
●Never use old gas.
●Avoid getting dirt or water in the fuel tank.
●Gas can age in the tank and make it hard to start up
the generator in the future.
●Never store generator for extended periods of time
with fuel in the tank.
1.
Step 1 - Check the gas level
STARTING THE GENERATOR
20