Model: MLR52
IMPORTANT: Read this manual fully before assembly
and use and observe all safety rules and operating
instructions
PETROL
ENGINE
MLR52 2 Stroke2
Contents
Technical Specification 2
Safety 3
Starting 5
Running 7
Maintenance 8
Troubleshooting 9
Warranty 10
Exploded Diagram 11
Parts List 12
Technical Specification
Type Single Cylinder 2-Stroke Air
Cooled
Cylinder Capacity
51.7
Max Power/Revolutions
1.4/6500 kW/r/min
Noise Level
≤104 dB(A)
Petrol/Oil Ratio
Synthetic Oil 40:1
Mineral Oil 25:1
Fuel Tank Capacity
1.2 litre
Oil Type
2-stroke, synthetic or mineral
Spark Plug Gap 0.5 - 0.7 mm
Starting Method
Easy start manual pull cord
Net Weight
≤ 4.2 kg
Overall Dimensions
283x178x254 mm
MLR52 2 Stroke 3
Safety
Thank you for purchasing our engine. This manual covers the operation and
maintenance of your engine.
All information in this publication is based on the latest product information
available at the time of printing. Forest Master 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 engine and should
remain with it if it is resold.
Pay special attention to statements preceded by the following words:
WARNING! Indicates a strong possibility of severe personal injury or death if
instructions are not followed.
CAUTION! Indicates a possibility of personal injury or equipment damage if
instructions are not followed.
WARNING!
Read the instruction carefully. Be familiar with the controls and proper use
of theengine.
Store fuel in containers specifically designed for this purpose. Refuel
outdoors only and do not smoke while refueling. Add fuel before starting the
engine. Never remove the cap of the fuel tank or add petrol while the engine
is running or when the engine is hot.
Replace the exhaust if faulty.
Replace all fuel tank and container caps securely.
Never store the equipment with petrol in the tank inside a building where
fumes can reach an open flame or fire.
Allow the engine to cool before storing in any enclosure.
MLR52 2 Stroke4
Safety
Petrol is highly flammable. Avoid smoking or bringing any flame or sparks
near fuel. Make sure to stop the engine and allow it cool before refuelling
the unit. Select outdoor bare ground for fuelling and move at least 3 m (10
ft) away from the fuelling point before starting the engine.
The exhaust and body of the engine get very hot when running, do not
touch the exhaust or the body while the engine is running or just after it has
stopped, allow the engine and exhaust time to cool.
To avoid electrical shock , don’t touch the ignition plug cap and wires.
Prevent children and persons other than the operator from touching the
engine.
The exhaust outlet must not point to the operator.
Ensure the exhaust and engine body are cool before covering the engine
after daily work.
To prevent damage or the misfire of the engine, check and maintain the
engine regularly and clean any carbon deposits in the exhaust silencer and
in the cylinder exhaust.
Do not to use pure petrol (without two-stroke engine oil) as fuel.
Petrol engine can not work at high speed for a long time without load.
Do not operate the engine if drunk, dizzy, on medication or otherwise
impaired.
Do not operate the engine if pregnant.
MLR52 2 Stroke 5
Starting
1. Add Fuel
The engine is specially designed for air-cooled two stroke mixed fuel use.
Use only 2-stroke oil that is suitable for air cooled engines. Do not use BIA or
TCW (2-stroke water-cooled marine type) 2-stroke oil.
How To Mix Fuel
Recommended mixing ratios;
Petrol 40 / Synthetic Oil 1 (Fig 1)
Petrol 25 / Mineral Oil 1 (Fig 2)
• Measure out the required quantities of petrol and oil to be mixed.
• Put some of the petrol into a clean, approved fuel container.
• Pour in all of the oil and agitate well.
• Pour in the rest of petrol and agitate again for at least one minute.
As some oils may be difficult to agitate depending on oil ingredients,
sufficient agitation is necessary for engine protection. If the agitation is
insufficient, there is an increased danger of early piston seizing due to
abnormally lean mixture.
• Put a clear indication on the outside of the container to avoid mixing up
with petrol or other containers.
• Indicate the contents on outside of container for easy identification.
1 part two-stroke
synthetic oil
40 parts petrol
Fig 1: Using Synthetic oil
1 part two-stroke
mineral oil
25 parts petrol
Fig 2: Using Mineral oil
Fig: 2
Fill the gasoline to the edge of the tank neck. (Fig 2).
MLR52 2 Stroke6
2. Check and clean the air filter. The air filter must be cleaned often as a
dirty air filter will lower the output power of the engine. If the air filter is
blocked by dust, use petrol to clean the air filter, then dip in the oil, wring
oil out and put the air filter back. (Fig 3)
Starting
Fig: 3
3. Turn on the petrol tap until the petrol flows out of the clear plastic
pipe. (Fig 4)
3. If the engine is cold, close the choke totally.(Fig 5).
If the engine has been run and is still hot, the choke must be totally open.
4. Open the throttle half way.
5. Draw the starter several times slowly, and then draw quickly.
Note: If excessive petrol causes starting difficulty, remove the ignition
plug and the input pipe, open the choke and the throttle totally, draw the
starter several times, then install the input pipe and start the engine.
After starting, open the choke totally. Allow the engine to warm up for
several minutes before operating the equipment.
Fig: 4
Fig: 5
MLR52 2 Stroke 7
Running
1. After the engine starts, run for 3~5 minutes at a low speed.
2. When the engine is warmed up, adjust the throttle according to the
required speed.
CAUTION: Don’t accelerate abruptly due to lack of lubrication of the engine
at the beginning of startup.
Avoid high idle speed and over speed. If the throttle is totally opened, the
engine will over speed, which not only shortens the service life of the engine
but also causes more problems in the engine.
Stopping The Engine
1. Reduce the engine to the slowest speed and run for 3-5 minutes.
2. Press the stop switch located either on the equipment or below the
pullstart, to stop the engine.
MLR52 2 Stroke8
Maintenance
1. Daily check
Check that all screws and nuts are secure.
Check for fuel leakage or air leakage.
2. Check after 20 hours running
Clean the air filter.
Clean the fuel strainer.
3. Check after 50 hours running
Refasten the nuts of the cylinder.
Clean the accumulated carbon in the exhaust of the cylinder.
Clean the accumulated carbon on the spark plug, adjust the clearance to
0.5-0.7mm. (Fig 6)
Clean the accumulated carbon in the intake and in the exhaust silencer.
Fig 6 Fig 7 Fig 8
Storage
1. Totally remove any fuel in the tank and in the carburetor, close the
choke totally and draw the starter 3-5 times.
2. Remove the spark plug. Add a small amount of engine oil through the
spark plug hole into the cylinder and draw the starter 2-3 times to move
the piston to top dead centre. Install the spark plug.
3. Use a soft cloth with engine oil to clean the surface of the Engine. Store
the engine in a dry and dust free location.
MLR52 2 Stroke 9
Troubleshooting
1. Fails to start
• Fuel contaminated with water, replace it.
• The spark plug has accumulated carbon or has been broken through.
• Poor contact of the high-voltage wire with the spark plug.
•
2. The engine starts, but can’t run fast
• The choke is not open totally
• The ratio of the engine oil and the gasoline is not correct.
• The fuel may be contaminated.
•
3. The engine runs, but has not enough power
• The air filter is may be blocked by dust.
• The cylinder exhaust and the silencer may be blocked by accumulated
carbon.
• The piston or piston rings and the cylinder may have been badly worn
out.
• The fuel strainer may be blocked by dust.
• The cylinder or cylinder head has oil leakage and air leakage.
•
4. The engine stops suddenly when running
• Run out of fuel.
• The high-voltage wire drops.
• The spark plug has accumulated carbon or is broken.
• The fuel strainer is blocked by dust.
• The fuel is contaminated.
• The air hole of the tank lid is blocked by dust.
MLR52 2 Stroke10
Warranty
Warranty
This product carries a limited parts warranty for 1 year from the
date of purchase. Please keep your proof of purchase as this will be
required for any claim.
Should this product become defective, contact the store where it
was purchased and either replacement parts will be issued, it will
be repaired or it will be replaced free of charge.
IMPORTANT: NO RESPONSIBILITY IS ACCEPTED FOR INCORRECT
USE OF THIS PRODUCT. MODIFICATION OF THIS PRODUCT
(UNLESS SAID MODIFICATION HAS BEEN AUTHORISED BY
FOREST MASTER) WILL VOID THE WARRANTY.
This Warranty Does Not Cover:
1. Any part that has become inoperative due to misuse, abuse,
neglect, accident, improper maintenance, or alteration
2. The unit, if it has not been operated and/or maintained in
accordance with the owner’s manual
3. Normal wear
4. Routine maintenance items such as lubricants, blade sharpening
5. Normal deterioration of the exterior finish due to use or exposure
Shipping Charges:
Shipping charges for the delivery or collection of the unit, parts
of the unit or attachments to the unit are the responsibility of the
purchaser. The purchaser must pay transportation charges for any
part submitted for replacement under this warranty unless such
return is requested by Forest Master.
MLR52 2 Stroke 11
Exploded Diagram
MLR52 2 Stroke12
Parts List
MLR52 2 Stroke 13
Parts List
NOTE: It is our policy to continually improve products and as such we reserve the right to alter
data, specifications and component parts without prior notice.
Manufactured Forest Master Limited.
Registered Office:
Forest Master Ltd, Industry Road, Heaton, Newcastle Upon Tyne, NE6 5XB, United Kingdom.
Tel: +44 191 2766553 email: info@forest-master.com - web: www.forest-master.com
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