Partner K 650/700 Active Instruction manual

P AR T NER
R
Wor k shop
M a nu a l

1
©Copyright Partner Industrial Products, Sweden
Workshop Manual
Petrol power cutters
Contents
General recommendations .................................................. 2
1. Starter unit ......................................................................... 3
2. Ignition system ............................................................... 11
3. Fuel system ..................................................................... 19
4. Centrifugal clutch ........................................................... 41
5. Cylinder and piston ........................................................ 47
6. Crankshaft and crankcase ............................................. 59
7. Cutting equipment .......................................................... 77
8. Tools ................................................................................. 85
9. Technical data ................................................................. 93
This manual covers models:
K 650/700 Active
K 950/1250 Active

2
General recommendations
Keep this in mind:
Do not start the engine unless the clutch and clutch drum
are fitted.
Do not touch hot parts, e.g. silencer and clutch, before they
have cooled sufficiently to avoid burn injuries.
Avoid getting petrol or oil on the skin or in the mouth. Use
protective cream on the hands. This reduces the risk of
infection and makes it easier to wash off dirt. Prolonged
exposure to engine oil can be hazardous to health.
Never start the engine indoors. The exhaust fumes are
toxic!.
Wipe up spilled oil immediately from the floor to avoid
slipping.
Do not use tools which are worn or have a poor fit, e.g. nuts
and screws.
+ Always work on a clean work bench.
+ Always work in a logical way to make sure that all parts are
correctly fitted and that screws and nuts are tightened.
+ Use special tools where so recommended in order to do the
work correctly.
Fire hazard
Handle petrol with respect since it is highly inflammable.
Do not smoke, and make sure that there are no naked flames or
sparks in the vicinity.
Make sure that there is a functioning fire extinguisher in the
vicinity.
Do not try to extinguish a petrol fire with water.
Use an anti-spill fuel can.
Toxic fumes
Read the instructions carefully when using cleaning liquids.
Make sure that there is adequate ventilation when handling petrol
and other viscous liquids.
The engine exhaust fumes are toxic. Test run the engine outdoors.
Special tools
Some work procedures in this Workshop Manual require the
use of special tools. In each section where this is appropriate
the tool and order number are illustrated.
We recommend the use of special tools partly to avoid personal
injury and partly to eliminate expensive damage to the
components in question.
Sealing surfaces and gaskets
Make sure that all sealing surfaces are clean and free from the
residue of old gaskets. Use a tool which will not damage the
sealing surface when cleaning it. Scratches and irregularities
are removed with a fine, float cut file.
Sealing rings
Always replace a sealing ring which has been dismantled. The
sensitive sealing lip can easily be damaged and result in poor
sealing capacity. The surface which the seal seals must also be
completely undamaged. Lubricate the sealing lip with grease
before it is fitted and make sure that it is not damaged, e.g. by
the shoulder and splines on a shaft. Use tape or a conical
sleeve as protection. It is important that the sealing ring is
correctly turned for it to function as intended.
The engine exhaust from this product
contains chemicals known to the State
of California to cause cancer, birth
defects or other reproductive harm.
WARNING
!
!
!
!
!
!
!

3
1
Starter unit
1.
Contents
Dismantling of the starter unit .............................................. 4
Replacing the starter cord without dismantling the pulley ... 5
Dismantling ........................................................................... 7
Assembly .............................................................................. 8

4
A
1Starter unit
WARNING!
When working on the starter unit wear protective glasses to avoid eye injuries in the
event that the return spring flies out.
Dismantling of the
starter unit
Mod. 650, 700
Dismantle the air filter cover, intermediate
wall and cylinder cover.
Dismantling of the
starter unit
Mod. 650, 700
Untighten the screws for the air filter
cover.
Lift off the cover and intermediate wall.
Release the screw (A) and lift off the
cylinder cover.
Dismantle the starter unit from the engine
body.
Untighten all the screws and lift off the
starter unit.
Release the spring tension.
Pull out the starter rope approx. 30 cm
(12 in).
Hold the pulley with your thumb and place
the cord in one of the recesses in the
pulley.
Release the spring tension.
!

5
1
K650/700
K950
K1250
Starter unit
Anchor the rope round the hub on the
pulley as shown in the illustration.
Pull the rope tight and make sure that the
free end is as short as possible.
Cord lengths
Models 650, 700, 950: 1150 mm.
Models 1250: 1250 mm.
These lengths apply to Ø 4 mm cord.
Allow the pulley to slowly rotate back-
wards.
Remove the starter handle.
Allow the pulley to slowly rotate back-
wards.
NOTE!
Brake the rotation with the thumb.
Untie the knot on the starter rope and
remove the starter handle.
Tips!
The knot may be difficult to untie. It is
easier if it first is tapped with a hammer
while placed on a hard surface.
Replacing the starter
cord without dismant-
ling the pulley
Mod. 650, 700, 950, 1250
Remove any remaining rope from the
pulley and check that the return spring
recoils.
Insert the new starter rope through the
hole in the pulley.
Replacing the starter
cord without dismant-
ling the pulley
Mod. 650, 700, 950, 1250
Remove any remaining rope from the
pulley.
Check that the return spring and its
attachment in the pulley has not been
damaged by turning the pulley clockwise.
Enter the new starter rope through the
hole in the pulley as shown in the illustra-
tion.
Mod. 950, 1250
Remove the screws which hold the star-
ter unit, and lift off the starter unit.
The next stage in the dismantling work
follows mod. 650/700.
Mod. 950, 1250
Remove the screws which hold the star-
ter unit, and lift off the starter unit.
NOTE!
The air filter and cylinder covers do not
need to be dismantled.
The next stage in the dismantling work
follows mod. 650/700.

6
1
Max
+1/2
Starter unit
Anchor the starter rope in the starter
handle with a double knot.
Insert the rope through the rope guide in
the starter housing and anchor it in the
starter handle with a double knot.
Tension the return spring.
Check that the spring tension is completely
released, and lift the starter cord up into
the cut-out in the pulley.
Wind the pulley 7 turns
clockwise.
Pull the cord out completely and check
that the pulley can be turned at least a
further half turn.
4. Pull the cord out completely and check
that the pulley can be turned at least
a further half turn.
3. Wind the pulley 7 turns
clockwise.
Be careful and brake the pulley with
your thumb.
Tension the return spring.
1. Check that spring tension is competely
released.
2. Lift the starter cord up into the cut-out
in the pulley.

7
1
Starter unit
Dismantling
Mod. 650, 700, 950
Remove the screw in the centre of the
pulley and lift off the pulley.
Dismantling
Mod. 650, 700, 950
Remove the screw in the centre of the
pulley.
Lift off the pulley.
Dismantle the spring cassette.
WARNING!
The return spring in the spring cass-
ette is pre-tensioned and can if not
handled carefully during dismant-
ling/fitting fly out and cause perso-
nal injury.
Remove the screws and lift off the spring
cassette.
WARNING!
The return spring in the spring cass-
ette is pre-tensioned and can if not
handled carefully during dismant-
ling/fitting fly out and cause perso-
nal injury.
!!
!
Mod. 1250
Remove the screw in the centre of the
pulley and lift off the pulley.
Make sure that the return spring is
completely released, and dismantle the
pulley.
Mod. 1250
Remove the screw in the centre of the
pulley and lift off the pulley.
Make sure that the return spring is
completely released.
Remove the screw and washer in the
centre of the pulley.
Carefully lift off the pulley.
WARNING!
The return spring is
not placed in a separate cassette but is placed directly in the
starter unit cover.
Observe care during dismantling/assembly, the spring can fly out and cause
personal injury.

8
1
B
C
Starter unit
Fit the other parts in the pulley hub.
NOTE!
Turn the metal sleeve (B) correctly.
Check that the O-ring (C) is undamaged.
Lubricate it with a few drops of oil.
Tighten the centre screw and check that
the pulley can turn freely.
Anchor the starter cord in the starter
handle with a double knot.
Enter the cord through the cord guide in
the starter unit and anchor it in the starter
handle with a double knot.
Anchor the cord in the pulley.
Push the pulley on the shaft stem.
Anchor the cord round the pulley hub as
shown in the illustration.
Push the cord down on the shaft journal in
the starter unit housing.
Make sure that the return spring grips in
the pulley.
Lubricate the starter housing stem and
pulley with a few drops of oil.
Assembly
Mod. 650, 700, 950
Clean the starter unit components and fit
the spring cassette.
Assembly
Mod. 650, 700, 950
Clean the different starter unit parts.
Lubricate the return spring with oil and
place the spring cassette in the starter
unit housing.
Make sure that the spring end is not
clenched.
Tighten the screws.

9
Max
1
+1/2
Starter unit
Mod. 1250
Press down a new return spring in the
starter unit cover.
NOTE!
Do not remove the lock round the spring,
but push down the spring all round by
using your thumbs.
Lubricate the spring with a few drops of
oil.
Anchor the starter cord round the hub of
the pulley as shown in the diagram.
Push the cord wheel down on the shaft
journal in the starter unit housing.
Make sure that the spring grips the cord
wheel.
Lubricate the bearing with a few drops of
oil.
Mod. 1250
Press a new return spring down in the
starter unit cover.
Lubricate the spring with a few drops of
oil.
Anchor the cord in the pulley.
Push the pulley down onto the shaft jour-
nal.
Tension the return spring.
Check that the spring tension is completely
released, and lift the starter cord up into
the cut-out in the pulley.
Wind the pulley 7 turns
clockwise.
Pull the cord out completely and check
that the pulley can be turned at least a
further half turn.
4. Pull the cord out completely and check
that the pulley can be turned at least
a further half turn.
3. Wind the pulley 7 turns
clockwise.
Be careful and brake the pulley with
your thumb.
Tension the return spring.
1. Check that spring tension is competely
released.
2. Lift the starter cord up into the cut-out
in the pulley.

10
1
Fit the starter unit and other parts in the
reverse order to dismantling.
Fit the starter unit.
Pull out the starter cord a little. Place the
starter unit in position. Release the star-
ter cord and check that the pawls engage
the pulley.
Tighten the screws.
Enter the cord through the cord guide in
the starter unit and anchor it in the starter
handle with a double knot.
Anchor the starter cord in the starter
handle with a double knot.

11
2
Ignition system
2.
Contents
The principle of the ignition system ............................ 12
Checking the ignition spark ........................................ 13
Replacing the spark plug protection ........................... 15
Dismantling ................................................................. 15
Starter pawls ............................................................... 17
Assembly .................................................................... 17

12
2
A
B
C
F
F
G
Volts
+
-
0
E
S
N
S
N
1
1
ADBC
2
2
3
3
The engine is fitted with an electronic ignition sys-
tem consisting of flywheel, ignition coil and trigger
unit.
The ignition system has no moving parts. A defective
component cannot be repaired but must be replaced
with a new one.
The ignition spark in an electronic ignition system
has a very short burn time and may therefore be
experienced as weak, and sometimes be dif ficult to
see during trouble shooting.
NOTE!
During all test running of the cutting saw the
clutch and clutch cover must be fitted before the
engine is started!
Ignition system
E = Ignition point
F = Trigger unit
G = Stop switch
The ignition module components are
completely enclosed to protect them from
moisture and dirt.
In the event of a failure in the ignition
module it must be replaced with a new
one.
A = Primary coil
B = Secondary coil
C = Iron core
F = Trigger unit
Principle of the ignition
system
The ignition system is completely en-
closed and no after-adjustment of the
ignition point is possible or necessary.
The ignition module is built up of an iron
core (C). Round this lies the primary coil
(A) which consists of a small number of
turns of thick copper wire. Outside this
lies the secondary coil (B) which has a
very large number of turns of copper
wire.
The trigger unit (F) is fitted on the
secondary coil and has the purpose of
breaking the current (D) in the primary
winding at exactly the right time, i.e. just
before the piston reaches the top dead
centre.
When the permanent magnet (1) on the
flywheel passes the ignition module’s
iron core, an electric current is generated
in the primary coil (A). At the breaking
moment the current in the primary coil
rises from 5 volts to approx. 200 volts by
means of induction.
In the secondary coil (B) a high voltage
(approx. 20 000 volts) is simultaneously
transformed to the spark plug.
Models K650,K700, K950 and K1250
have a built-in overspeeding protection
in the electronic unit which limits the
unloaded speed of the engine to about
9 750 rpm.
The ignition module components are
completely enclosed to protect them from
moisture and dirt.
In the event of a failure in the ignition
module it must be replaced with a new
one.

13
2
502 71 13-01
Ignition system
Checking ignition spark
Clean the electrodes and check the
electrode gap.
Checking ignition spark
Dismantle the plug and clean it from soot
by means of a wire brush.
Check the electrode gap. It should be 0.5
mm (.020 in).
Adjust the gap to the correct distance with
the side electrode.
If the electrodes are worn down more
than 50% the plug should be replaced.
If the electrodes are worn down more
than 50% the plug should be replaced.
If the gap is too wide this results in strain
on the ignition module and the risk of
short circuiting.
Check if there is a spark by pulling the
engine over with the starter.
Try with test plug No. 502 71 13-01 if
there is no spark.
Check if there is a spark by pulling the
engine over with the starter.
Ground the plug to the cylinder and briskly
pull the starter handle.
Make sure that the stop switch is in the
start position.
There should be a spark between the
electrodes.
If there is no spark try with test plug No.
502 71 13-01!
If there is a spark the fault lies in the plug.
Replace the plug.
Try with a new plug.
If there is no spark disconnect the stop
switch wire.
If necessary replace the switch.
Try with a new plug.
If there is still no spark remove the short
circuiting cable from either the ignition
module or the stop switch.
If there is now a spark the fault lies in the
stop switch.
Replace the switch.

14
2
502 51 34-06
A
B
0,3 –0,5 mm
Ignition system
Check the ignition cable’s connections. Still no spark?
Check the plug connection.
Pull off the rubber protection at the plug
(A) and ignition module (B) and check
that the ignition cable is undamaged. If
necessary cut off a piece of the cable to
ensure good contact.
Grease the cable ends before fitting. Grease the cable ends to simplify fitting
and to prevent moisture penetrating into
the connections.
Check the other cables and connections. Still no spark?
Check the other cables and connections
for poor contact (dirt, corrosion, cable
break and damaged insulation).
Tips!
Use an Ohm meter to check if there is a
cable break, e.g. as a result of pinching.
Check the air gap. Still no spark?
Check the air gap between the flywheel
magnet and ignition module. The gap
should be 0.3 –0.5 mm (0.012–0.020").
Use air gap measure 502 51 34-06.

15
2
502 51 34-06
K 950 K 1250
Ignition system
Adjust the air gap. Adjust where appropriate the air gap to
the correct distance.
•Release the screws holding the
ignition module.
•Position the feeler gauge on the
magnets of the flywheel and press the
ignition module against flywheel.
•Tighten the screws and check the air
gap again.
If there is still no spark then the ignition
system should be replaced.
Replacing spark plug
protection
1. Take the ignition cable through the
plug protection.
2. Fit the contact spiral on the ignition
cable.
Replacing spark plug
protection
1. Grease the ignition cable with a little
grease and take it through the plug
protection.
2. Cut off a piece of the ignition cable
(approx. 5 mm, 3/16") to obtain full
contact with the spark plug protection.
3. Fit the contact spiral on the ignition
cable and make sure that the wire is
folded along the cable.
4. Pull the contact spiral in the plug
protection.
NOTE!
It is important that the point on the contact
spiral meets the middle of the ignition
cable to prevent sparking.
Dismantling
Mod. 650, 700
Dismantle the cylinder cover, plug, star-
ter unit, and air conductor.
Dismantle the ignition module and re-
lease the other cable connections.
Dismantling
Mod. 650, 700
Dismantle the plug, cylinder cover, star-
ter unit, and air conductor.
Dismantle the ignition module by remo-
ving the two screws.
Release the other cable connections and
lift off the ignition module.
Mod. 950, 1250
Dismantle the starter unit, air filter cover,
air filter and cylinder cover.
Remove the air conductor.
Note the position of the cables so that
they can be replaced in the same way.

16
502 54 15-01
502 51 49-02
2Ignition system
Remove the flywheel nut. Remove the flywheel nut by means of a
suitable box spanner.
Fit piston stop No. 502 54 15-01 in the
spark plug hole.
Insert piston stop No. 502 54 15-01 in the
sparking plug hole.
Make sure that the piston stop does not
come out through the exhaust port, it
must rest against the front of the cylinder
wall when the piston approaches Top
Dead Centre.
Mod. 650, 700, 950, 1250
Dismantle the starter pawls.
Mod. 650, 700, 950, 1250
Dismantle the starter pawls by releasing
the screws. Make sure the small washer
which lies next to the flywheel is not lost.
Pull off the flywheel. Remove the flywheel by means of fly-
wheel puller 502 51 49-02, which is
screwed tight in the holes for the pawls.
NOTE!
Centre the flywheel puller over the shaft
centre. Select suitable screws and tighten
the withdrawing tool.

17
A
2
Ignition system
Tips!
Tap the flywheel puller screw sharply with
a hammer if the flywheel sits tight.
Tips!
The flywheel may sit very tightly on the
shaft. To simplify dismantling - tap the
flywheel pullers screw sharply a few
times. Hold the engine in the air with the
handle on the flywheel puller.
Starter pawls
Mod.650, 700, 950, 1250
Check the starter pawls for wear and
damage.
Replace damaged parts.
The pawls are mounted on the flywheel
with contact screw and spacer washer
(A).
It is important not to forget the washer
during assembly.
Check that the pawls move freely.
Starter pawls
Mod. 650, 700, 950, 1250
Check the starter pawls for wear and
damage.
Replace damaged parts.
The pawls are mounted on the flywheel
with a contact screw.
Pay attention to the spacer washer (A)
during dismantling and assembly.
Assembly
Check that the keyway and key in the
crankshaft are undamaged. (Mod. 650,
700, 1250)
Assembly
Check that the keyway and key in the
crankshaft are undamaged. (Mod. 650,
700, 1250)
Fit where appropriate a new key and
make sure that it is positioned correctly in
the keyway.
Check that the keyway and the cast key
(mod. 950) in the flywheel are undamaged.
Fit the flywheel.
Check that the keyway and the cast key
(mod. 950) in the flywheel are undamaged.
Fit the flywheel and check that the key
and keyway are correctly positioned
before the flywheel nut is tightened.
Tighten the nut with tightening torque 25–
35 Nm.

18
2
502 51 34-06
0,3 –0,5 mm
Ignition system
Fit the ignition module.
Adjust the air gap (0.3 –0.5 mm/0.012–
0.020").
Fit the other cables.
Fit the other parts in the reverse order to
dismantling.
Fit the ignition module.
Adjust the air gap to the correct size (0.3
–0.5 mm/0.012–0.020").
See also page 14–15.
Fit the other cables and make sure that
they are correctly positioned in the cable
grooves etc. so that they cannot be
damaged.
Fit the other parts in the reverse order to
dismantling.

19
Fuel system
Contents
Air filter ......................................................................... 20
Centrifugal cleaning (Active) ....................................... 21
Fuel filter ...................................................................... 22
Carburettor, dismantling/assembly .............................. 23
Carburettor design ....................................................... 25
Jets .............................................................................. 25
Speed limiter ................................................................ 26
Compensation device for blocked air filter .................. 26
Disassembly of the carburettor ................................... 27
Assembly of the carburettor ........................................ 30
Carburettor setting ....................................................... 32
Tank air vent ................................................................ 34
Throttle control ............................................................. 35
Trouble shooting .......................................................... 40
3.