7
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 off onto the ground.
Adjusting the Chain oil output.
The chain oil flow 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
IMPORTANT!
The oil tank should become nearly empty by the time fuel is used
up. Be sure to refill 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
fine tuning due to changes in
operating conditions. Before
adjusting the carburettor
make sure that the provided
air and fuel filters 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.
Model MCS38 ‘H’ Needle:
– ±
‘L’ Needle:
1
– ±
Model MCS25 ‘H’ Needle:
1
– ±
‘L’ Needle:
1
– ±
Model MCS45 ‘H’ Needle:
1
– ±
‘L’ Needle:
1
– ±
Model MCS52 ‘H’ Needle:
1
– ±
‘L’ Needle:
1
– ±
Model YR4503 ‘H’ Needle:
1
– ±
‘L’ Needle:
1
– ±
‘H’ Needle
‘L’ Needle
Idle adjuster
screw
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 first firing sound is heard.
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 first firing
sound is heard and the choke knob is in the start
Fuel
Chain
Oil
