DR R225, R300, R390 Safety & Operating Instructions Manual
DR
SAFETY & OPERATING INSTRUCTIONS
®
R225, R300 and R390 ENGINES
Read and understand this manual and all instructions before operating the DR R225, R300 and R390 ENGINES.
Original Language
DR Power Equipment
Toll-free phone: 1-800-DR-OWNER (376-9637)
Fax: 1-802-877-1213
Website: www.DRpower.com
Table of Contents
I: Safety Precautions .............................................................................................................................................................................. 3
II: Parts Description .............................................................................................................................................................................. 4
III: Pre-Operation Inspection ................................................................................................................................................................ 5
IV. Starting the Engine .......................................................................................................................................................................... 8
V. Stopping the Engine ......................................................................................................................................................................... 11
VI. Exhaust Control System ................................................................................................................................................................... 13
VII: Maintenance ................................................................................................................................................................................... 14
VIII. Transport and Storage .................................................................................................................................................................. 17
IX: Troubleshooting ............................................................................................................................................................................... 18
X. Specifications .................................................................................................................................................................................... 22
XI. Electrical Diagrams .......................................................................................................................................................................... 23
Conventions used in this manual
This indicates a hazardous situation, which, if not avoided, could result in death or serious injury.
This indicates a hazardous situation, which, if not avoided, could result in minor or moderate injury.
This information is important in the proper use of your machine. Failure to follow this instruction could result in damage to
your machine or property.
Additional Information and Potential Changes
DR Power Equipment reserves the right to discontinue, change, and improve its products at any time without notice or
obligation to the purchaser. The descriptions and specifications contained in this manual were in effect at printing.
Equipment described within this manual may be optional. Some illustrations may not be applicable to your Engine.
2 DR
®
R225, R300 and R390 Engines
I: Safety Precautions
There is a possibility of voiding the warranty and personal or equipment damage if instructions are not followed.
Please pay special attention to the following:
1. Operate the engine according to the recommendations in your owner's manual. Do not overload, overrun the engine or
run it with low load and at low speed for a long period of time.
2. Use regulated 87 octane brand of gas. The fuel should be fully deposited and filtrated before use. Keep the fuel filler clean
to prevent contamination.
3. Change the oil periodically as described in the “Maintenance” section of this manual.
4. Periodically check the installation, connection and the tightness of the mounting hardware. Tighten when necessary.
5. Periodically clean the air filter; change it as indicated in the “Maintenance” section.
6. This gasoline engine is air-cooled, so clean the cooling fins, recoil cover and air intake to allow the engine cool normally.
7. The operator should be familiar with the working principle and structure of this gasoline engine, knowing how to make an
emergency stop when needed. Do not allow anyone without training to operate the engine. Perform periodical
maintenance per the “Maintenance” section. Fix all operation problems immediately. Do not run the engine if it is not
operating properly.
8. Only operate the engine in a well-ventilated place, keep it at least one meter away from building walls or other equipment,
keep engine away from inflammables such as gasoline, matches and so on to avoid possibility of fire.
9. Refuel in a well-ventilated area with the engine stopped, do not smoke and do not allow flames or sparks in the refueling
area.
10. Do not overfill the fuel tank to avoid fuel spilling out. If there is spilled fuel around, be sure to clean it thoroughly before
starting.
11. Do not run the engine inside buildings or enclosure areas.
12. The exhaust muffler is very hot during running the engine and even after the engine stops. Never touch it, or you may get
burns. Do not transport or store the engine until it has cooled down entirely.
13. Safe warning label:
Please carefully read warning labels before operating. DR Power Equipment is not responsible if a person is hurt, or
equipment becomes damaged due to disregarding warning labels.
CONTACT US AT www.DRpower.com 3
II: Parts Description
Air
r
Throttle
Lever
Choke Lever
Fuel Shutoff
Engine Switch
Fuel Tank Cap
Fuel Tank
Starter
Handle
Oil Dipstick
Recoil Starter
Oil Drain
Plug
Cleane
Spark
Plug
4 DR
®
R225, R300 and R390 Engines
Muffler
Oil Plug
III: Pre-Operation Inspection
1. ENGINE OIL
Use 4-stroke engine oil, API service classification SJ class or equivalent. Check the API service label on the oil container to be sure
it includes the letters SJ class or equivalent.
SAE 10W-30 is recommended for general use. Other viscosities shown in the chart may be used
when the average temperature in your area is within the indicated range.
Oil level check
1. Remove the dipstick and clean it with a rag.
2. Reinsert the dipstick into the oil filling hole without screwing it in. Pull the dipstick out and
check oil level.
3. If the oil level is too low, add the recommended engine oil up to the oil filling neck.
4. Reinstall the dipstick.
R225 Oil Capacity = .5 qt/16 oz (0.5L)
R300 and R390 Oil Capacity = 1.16 qt/37 oz (1.1L)
Drain Plug
SAE Viscosity Grades
Environment Temperature
Oil Dipstick
Oil Upper Level
Oil Lower Level
Running the engine with insufficient engine oil may damage the engine severely and would not be covered under warranty.
2. AIR CLEANER
Remove the air cleaner cover and check the air filter to make sure it is clean and not damaged. Clean or replace it as necessary
(see the “Maintenance” section for maintenance of the air filter).
Never run the engine without the air filter and cover installed or damage to the engine could result. Damage to the engine
by not having the air filter and cover installed is not covered under warranty.
CONTACT US AT www.DRpower.com 5
3. FUEL RECOMMENDATION
1. Remove the fuel tank cap and check the fuel level.
2. If the level is too low, refuel the tank to the recommended level. Remember to never fill fuel over the fuel filler shoulder.
Gasoline is extremely flammable and is explosive under certain conditions.
Only add fuel in a well-ventilation area with the engine stopped. Do not smoke and do not allow flames or sparks in the area
where gasoline is stored or where the fuel tank is refueled.
Do not overfill the fuel tank (there should be no fuel in the filling neck). After refueling, make sure the fuel tank cap is installed
securely.
Be careful not to spill fuel when refueling. Spilled fuel or fuel vapor may ignite. If any fuel is spilled, make sure the area
cleaned up and is dry before starting the engine.
Avoid repeated or prolonged contact with skin or breathing of fuel vapor. Keep out of reach of children.
Fuel Filler Shoulder
Maximum
Fuel Level
Fuel Filler
R225 Fuel Tank Capacity = .9 gal/3.6 qt (3.4L)
R300 and R390 Fuel Tank Capacity = 1.72 gal/6.9 qt (6.5L)
Fuel may damage paint and plastic. Be careful not to spill fuel when refueling. Any damage due to fuel spilling is not covered
under warranty.
It is normal to hear a "light knocking" sound when the engine is overloaded. Do not be concerned if this occurs. If "knocking"
or sounds occur at a steady speed under normal load, change the brand of gasoline; if the sounds continue, consult your
dealer for help.
If you continue to run the engine with a "Knocking" sound during normal operation, it will damage the engine.
Continuing to use the engine with "Knocking" sounds from misusing will void the engine warranty.
6 DR
®
R225, R300 and R390 Engines
4. BATTERY CONNECTION
Use a 12V battery with your DR Engine.
Connect the battery’s positive (+) lead to the start relay terminal and connect it’s negative (-) lead to the engine mounting
Bolt, base screw or other grounding point with the engine (See the following picture).
Check the battery's connecting point; make sure that it is tight and not rusted. If rusted, clean and connect.
Start Relay
Negative
(-) Wire
Positive
(+) Wire
CONTACT US AT www.DRpower.com 7
IV. Starting the Engine
ON
r
ON
OFF
Choke Lever
CLOSE
Fuel Shutoff
OPEN
1. Turn the fuel Shutoff to the “ON” (OPEN) position.
2. Turn the choke lever to the “CLOSE” (CHOKE) position. If the engine is hot from
use, don’t close the choke.
3. Move throttle lever to the left a little.
Throttle Leve
High Speed
Manual Engine Switch
Low Speed
4. Starting the engine – Manual Start
a. Turn the engine switch to the “ON” (START) position.
OFF
8 DR
®
R225, R300 and R390 Engines
b. Pull the recoil starter grip lightly until resistance is felt, then pull briskly.
Recoil Starter
Grip
Don’t allow the recoil starter grip to snap back against the engine. Return it gently to prevent damage to the starter
5. Starting the engine – Electric Start
a. Turn the engine switch to the “START” position and hold it there until the
engine starts.
b. When the engine starts, allow the engine switch to return to the “ON” position.
Engine Switch
Do not use the starter for more than 5 seconds or starter motor damage may occur. If the engine fails to start, release the switch
and wait 10 seconds before operating the starter again.
6. Once the engine is running push the choke lever to the “OPEN” position.
Choke Lever
OPEN
CLOSE
CONTACT US AT www.DRpower.com 9
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