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6
engine.
Mix a regular 91 octane gasoline (leaded or unleaded, alcohol
free) and a quality proven motor oil for air cooled 2 cycle
engines.
Recommended mixing ratios:
Models MCS25, MCS38, MCS46, MCS52 and YR4503
Engine Condition Gasoline to Oil
Up to 20 hours use 25:1
All Models
After 20 hours use 25:1 or 40:1 (see below charts)
When using a mineral oil:
Mixing Ratio 25:1
Gasoline (litres) 1 2 3 4 5
2cycle oil (ml) 40 80 120 160 200
When using a semi-synthetic oil:
Mixing Ratio 40:1
Gasoline (litres) 1 2 3 4 5
2cycle oil (ml) 25 50 75 100 125
WARNING!
Keep open ames away from the area where fuel is handled
or stored. Mix and store fuel only in an approved gasoline
container.
IMPORTANT!
Most engine troubles are caused, directly or
indirectly, by the fuel used on the machine. Take special care
not to mix a motor oil for 4 cycle engines.
HOW TO MIX FUEL
WARNING!
Thorough mixing of the oil and fuel is critical to the
life and performance of the engine. Take extreme
care.
1. Measure out the quantities of gasoline and oil to be mixed.
2. Put some of the gasoline into a clean, fuel container.
3. Pour in all of the oil and agitate well.
4. Pour in the rest of gasoline and agitate again for at least
one minute. Some oils may take longer to mix depend-
ing on their ingredients. Thorough mixing is essential for
engine longevity.
FILLING THE FUEL TANK
1. Untwist and remove the fuel cap. Rest the fuel cap in a
dust free place.
2. Fill fuel tank to 80% of the full capacity.
MSC25 = 184mL, MSC38 = 264mL, MCS46, 52 & YR4503 =
440ml.
3. Fasten the fuel cap securely and wipe up any fuel spillage
from around the engine.
CHAIN OIL
All models
Use Masport Chain Bar Oil Part # 833043. This is specially
formulated to give best results. Alternatively you can use a
good quality motor oil, SAE 10W ~ 30 all year round or SAE
#30~#40 in Summer and SAE #20 in Winter.
Refer to specications pg13 for OIL TANK capacities.
Open the box and assemble the guide bar and the saw chain
on the power unit as follows:
Note: For 45, 46 & 52 models assemble spike rst. Spike is
not needed for models S25 & 38.
WARNING!
The saw chain has very sharp edges. Use thick
protective gloves for safety.
1. Pull the front guard towards
the front handle to check
that the chain brake is not
engaged.
2. Loosen the nuts and
remove the chain cover.
3. Attach the spike to the
front, saw side of the
power unit.
4. Fix the hanger on the rear of
the power unit by screw - MSC25 only.
YR4503, MCS46 and
MCS52 only- tting
the Spike
5. Fit the chain over the sprocket and, while feeding the saw
chain around the guide bar, mount the guide bar to the
power unit. Adjust the position of chain tensioner nut on
the chain cover to the lower hole of guide bar.
IMPORTANT!
Pay attention to the correct direction of the saw chain.
6. Fit the chain cover to the power unit and fasten the nuts
until nger tight.
7. While holding up the tip of the bar, adjust the chain tension
by turning the tensioner screw until
the tie straps just touch the bottom
side of the guide bar.
8. Tighten the nuts securely with
the bar tip held up (12–15 Nm).
Then check the chain for smooth
rotation and proper tension while
moving it by hand. If necessary,
readjust.
IMPORTANT!
A new chain will stretch at the beginning of use. Check and
readjust the tension frequently as a loose chain can easily
derail or cause rapid chain wear and damage to the guide bar.
Fuel and Chain Oil Specications
WARNING!
Gasoline is very ammable. Avoid smoking
or bringing any naked ame or sparks near
the fuel.
Make sure to stop the engine and allow it to
cool before refuelling the unit. Select outdoor
bare ground for fuelling and move at
least 3m (10ft) away from the fuelling point before starting the
Hole
Tensone
nut
Chan cove
Tensioner screw
MCS38
MCS25,
45,46, 52
7
Push in the choke knob to closed position. Pull start
handle vigorously again until engine runs.
NOTE If the starter handle is pulled after the rst ring
sound is heard and the choke knob is in the start
position, too much fuel will enter into the engine resulting
in the engine failing to start.
3. Allow the engine to warm up with the choke lever pulled
out slightly.
WARNING!
Keep clear of the saw chain as it will start rotating
immediately upon starting of engine.
IMPORTANT!
When restarting immediately after stopping a hot
engine, leave the choke knob at the closed position
ADJUSTING THE OIL SUPPLY TO THE CHAIN
WARNING!
Make sure to set up the bar and the chain correctly
before adjusting the oil supply. If you don’t the rotating parts
may be exposed which is very dangerous.
After starting the engine. run the chain at
medium speed and see if excessive chain
oil is thrown o onto the ground.
Adjusting the Chain oil output.
The chain oil ow can be changed by inserting a screwdriver
in the hole on bottom of the clutch side. Adjust according to
your work conditions.
Chain Oil
Adjuster*
*This feature is not available on all models.
IMPORTANT!
The oil tank should become nearly empty by the time fuel is used
up. Be sure to rell the oil tank every time you refuel the unit.
STOPPING THE ENGINE
1. Release the throttle lever to allow the engine to idle for a
few minutes.
2. Set the switch to the “O” (STOP) position.
ADJUSTING THE CARBURETTOR
This is best done by an authorised Masport or
Morrison dealer
The carburettor on your
engine has been factory
adjusted, but may require
ne tuning due to changes in
operating conditions. Before
adjusting the carburettor
make sure that the provided
air and fuel lters are in good
condition and the fuel is properly mixed.
When adjusting take the following steps:
IMPORTANT!
Be sure to adjust the carburettor with the bar and
chain attached.
1. Stop engine and screw in both the ‘H’ and ‘L’ needles until
they stop. Never force them. Then set them back the initial
number of turns as shown below.
‘H’ Needle
‘L’ Needle
Idle adjuster
screw
IMPORTANT!
Do not use waste or recycled oil that can cause
damage to the oil pump.
TO GET MAXIMUM LIFE FROM YOUR ENGINE USE GOOD
QUALITY, WELL MIXED FUEL - AVOID...
1. Fuel with no oil (raw gasoline) that will very quickly cause
severe damage to the internal engine parts.
2. GASOHOL and E10. It can cause deterioration of rubber
and/or plastic parts and disruption of engine lubrication.
3. Mixing oils intended for use in four cycle engines with your
fuel. It can cause spark plug fouling, exhaust port blocking,
or piston ring sticking.
4. Mixed fuels which have been left unused for a period of
one month or more may clog the carburettor and result in
the engine failing to operate properly.
5. In the case of storing the chainsaw for a long period of
time, empty and clean the fuel tank. Turn the engine over to
empty the carburettor of the stale fuel.
6. When disposing of stale mixed fuel, take it to an authorised
disposal site.
Operating the Engine
STARTING THE ENGINE
Fill fuel and chain oil tanks respectively
and tighten the caps securely.
For models MCS25 & 38
1. Continuously push the priming
bulb until fuel comes into the bulb
(MCS25/38).
2. Put the switch to ‘I’ or up position.
3. Hold the throttle lever together with the throttle interlock
and push in the side throttle lock button. Release the
throttle lever to hold it at the starting position.
Throttle
interlock
Throttle
lever
Switch
4. Pull out the choke knob to the start position.
Closed
Choke
Knob
Start
5. While holding the saw unit securely
on the ground, pull the starter rope
vigorously.
WARNING!
Do not start the engine while dangling the chainsaw from
one hand. The saw chain may touch your body and cause
wounds that can be fatal.
6. If engine has started then stopped. Push the choke knob
in a little and pull the starter again to restart the engine
7. Allow the engine to warm up with the throttle lever pulled
out slightly.
For models MCS46, MCS52 and YR4503
1. For cold start, pull choke start lever.
2. Pull the starter cord until the rst ring sound is heard.
Fuel
Chain
Oil
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