Makita RBC411U User manual

T

ECHNICAL INFORMATION

PRODUCT

P 1/ 15

Models No.

Description

RBC411U

Petrol Brushcutter

CONCEPT AND MAIN APPLICATIONS

Model RBC411U is Petrol brushcutter developed based on Model RBC411
powered by 40.2 cm³ 2-stroke engine; therefore, the engine for this model is not
complied with well-known exhaust emission regulations.
The development concept of this model is to increase maneuverability, while
providing a cost advantage with newly designed Shaft section.

Its other features are:

• Symmetric design handle bar

• Ergonomic grip for higher maneuverability

Specification

Displacement: cm³

Engine

Compliance with main exhaust
emission regulations; CARB Tier 3,
EPA Phase 2, EU Stage 2

Carburetor

Starting
system

Starting system Recoil starter

Fuel tank capacity: L

Primer pump No

Spindle thread size

Handle style

Net weight*: kg (lbs)

Fuel
Max. output: kW (PS) 1.4 (2.0) [at 7,000 min.

Max. torque: N.m

ˉ¹ = rpm

Rapid start

(Spring-assisted recoil starter)

Decompression valve

Mixed gasoline

2.2 [at 5,000 min.

M10x1.25, Left-handed

Symmetric design bike handle

2-strokeType

40.2

10,000Max. speed at no load: min.ˉ¹ = rpm

6,800Max. spindle speed at no load: min.

No

Float type

No

No

1.1

7.3 (16)

H

W

Dimensions: mm (")

Length (L) 1,710 (67-1/2)

Width (W)

Height (H)

ˉ¹]

ˉ¹]

670 (26-3/8)

L

430 (17)

* Dry weight, without guard, cutting tool and shoulder harness

Standard equipment

Double blade 305mm (12") ................................................................ 1

Tool kit

(inc. Socket wrench 17-19, Hex wrench 4 and Hex wrench 5) .......... 1

Shoulder harness with double shoulder straps .................................... 1

Accessory bag ..................................................................................... 1

Note: The standard equipment for the tool shown above may vary by country.

Optional accessories

Triple blade 255mm (10"), Triple blade 305mm (12"), Star blade 230mm (9"), Star blade 255mm (10"),
Double blade 305mm (12"), Eddy blade (8-tooth blade) 230mm (9"), Eddy blade (8-tooth blade) 255mm (10"),
Saw blade 230mm (9"), Saw blade 255mm (10"), Nylon cutting head (Bump & Feed Z5L),
Nylon cutting head (Ultra Auto 6L), Protector (for cutting blade only), Universal guard (=Protector),
Universal guard extension

P 2/ 15

Repair

CAUTION: Repair the machine in accordance with “Instruction manual” or “Safety instructions”.

[1] NECESSARY REPAIRING TOOLS

DescriptionCode No. Use for

Retaining ring pliers ST-2 for External ring1R004 removing/ assembling Retaining rings

Retaining ring pliers RT-2E for Internal ring1R006

Bearing plate1R022

Pipe ring1R023

Air density tester1R127 diagnosing Carburetor

Crank shaft lock bolt1R155

1R219

1R269

1R311 Retaining ring pliers with Long bent nails

Torque wrench shaft 7-23N·m

Ratchet head 9.5 (for 1R219)1R220

Bearing extractor

Flywheel puller1R364 removing Flywheel
Feeler gauge set1R366 adjusting Ignition coil/ Spark plug

Wire brush making Spark plug clean

removing/ assembling Retaining rings

removing Clutch drum complete from Ball bearing 6003LLU

assembling Ball bearing 6003LLU to Clutch drum completeBearing setting pipe 20-12.21R028

locking Piston (with Crank shaft)

removing Piston pinPiston pin punch1R200

tightening Bolts

removing Ball bearings

removing Fuel tube from nipple of Carburetor

removing Retaining rings R-26 and R-32 in Gear case assembly

[2] GASKET

Once Gasket is removed:
(1) Replace Gasket with a new one.
(2) Clean up the mating surface where the gasket was installed to maintain its sealing performance.

[3] LUBRICANT/ ADHESIVE APPLICATION

(1) Apply 1g of Makita grease N No. 2 to Spiral spring in Recoil starter.
(2) When the inside of Gear case assembly is cleaned, supply 11g of Makita grease N No. 2 from the grease inlet.
(3) Apply 6g of Makita grease N No. 1 to the entire portion of Shaft complete in Shaft pipe complete.

[4] DISASSEMBLY/ ASSEMBLY
[4]-1. Warning

Follow the instructions described below in advance before repairing:

• Wear gloves.

• Remove the cutting tool from the unit, and if it is a saw blade, attach the blade cover to the blade.

• When the engine is hot from use, cool down the engine enough or you can get burned.

• Remove remaining fuel from Fuel tank and Carburetor completely. [FLAMMABLE MATERIAL KEEP FIRE AWAY]

• Remove Spark plug cap from Spark plug.

• Repair the engine on a stable workbench and in a clean workplace kept as free of dust and debris as possible.

• In order to avoid wrong reassembly, draw or write down where and how the parts are assembled, and what are the parts.

• It is also recommended to have boxes ready to keep disassembled parts by group.

• Handle the disassembled parts carefully. Clean and wash them properly.

• If some bolts and screws are too tight, use Impact driver.

• Tighten the bolts and the screws to the specified torque as shown in "[5] Tightening torque specifications".

• Each time after you mounted a main part of the engine such as the piston, check if it moves smoothly

without abnormal noise by manually turning the crankshaft.

• After completion of reassembly, check for loose parts or abnormal noise and vibration by manually turning the crankshaft.

Repair

[4] DISASSEMBLY/ ASSEMBLY
[4]-2. Engine and Shaft

DISASSEMBLING

(1) Remove M6x22 Hex socket head bolt that fastens Earth terminal to Clutch case complete.
Disconnect Bullet terminals of Lead wires. (Fig. 1)
(2) Loosen Mixing cap of Carburetor, then remove Piston valve from Carburetor. Push Piston valve against
the spring force to separate the cable end from Piston valve. (Fig. 2)
(3) Remove the rest of M6x22 Hex socket head bolts to separate Engine from Clutch case. (Fig. 3)

Fig. 1

Clutch case complete

M6x22 Hex
socket head bolt

Bullet terminals
of Lead wires

Earth terminal

Carburetor

P 3/ 15

Fig. 2 Fig. 3

Control cable

ASSEMBLING

Assemble by reversing the disassembly procedure.

Mixing cap

Piston valve The end of

Control cable

Spring

M6x22 Hex
socket head bolt
(3 pcs.)

[4]-3. Protector assembly, Bike handle

DISASSEMBLING

(1) Remove two M6x30 Hex head bolts (A) and Protector. (Fig. 4)
(2) Loosen M6x30 Hex socket head bolt (B) on the neck of
Gear case assembly, and then remove two M5x14 Hex socket
head screws.
Pull out Gear case assembly from the end of Shaft pipe complete.
(3) Remove two M6x30 Hex socket head bolts to separate Handle
section from Shaft pipe complete. (Fig. 5)

Fig. 4

M6x30 Hex

Shaft pipe complete

socket head
screw (2 pcs.): A

Protector

M6x30 Hex socket head bolt: B

Protector clamp

M5x14 Hex
socket head
screw (2 pcs.)

Gear case assembly

Fig. 5

Shaft pipe
complete

Clutch case complete

M6x30 Hex
socket head
bolt (2 pcs.)

ASSEMBLING

Assemble by reversing the disassembly procedure.

Repair

[4] DISASSEMBLY/ ASSEMBLY
[4]-4. Gear case assembly

DISASSEMBLING

(1) Remove Gear case assembly from Pipe shaft complete. (see Fig. 4)
(2) Remove Retaining ring R-26 from the groove in Gear case assembly with
1R311. (Fig. 6)
(3) Remove M8x10 + Hex bolt that is the stopper of Grease inlet on Gear case
assembly. (Fig. 7)
(4) Remove an assembled part of Spiral bevel gear 13*, Ball bearing 6000ZZ,
Ball bearing 6000 and Retaining ring S-10 by tapping Gear case assembly
with Plastic hammer. (Fig. 8)
(5) Remove Retaining ring R-32 from the groove in Gear case assembly with
1R311. (Fig. 9)
(6) Remove an assembled part of Ball bearing 629ZZ, Cutter shaft complete**
and Ball bearing 6201DDU from Gear case assembly. (Fig. 10)
Note: • When it is difficult to remove the assembled part from Gear case
assembly, heat up Gear case assembly with heat gun or like and then
try the step (5)/ (6) again.

• Spiral bevel gear 13* and Cutter shaft complete** cannot be supplied
individually. Order “Cutter shaft set” from us.
(7) Disassemble their assembled parts by using 1R269 and Arbor press.

P 4/ 15

Fig. 6

Groove in Gear
case assembly

Retaining ring
R-26

Fig. 7

M8x10
+ Hex bolt

Fig. 8

Ball bearing 6000

Ball bearing
6000ZZ

Retaining
ring S-10

Fig. 10

Spiral bevel gear 13* (The component of Cutter shaft set)

Ball bearing 629ZZ

Cutter shaft complete**
(The component of Cutter shaft set)

Ball bearing 6201DDU

Fig. 9

Groove in Gear
case assembly

Retaining
ring R-32

ASSEMBLING

Assemble by reversing the disassembly procedure.

Note: • Receive Gear case assembly with the U-shape table of

Arbor press, then press down Ball bearing 6201DDU
with 1R031 to set Cutter shaft complete in place.
(Fig. 11)

• Ball bearing 6000ZZ must be close to Retaining ring

S-10. (See Fig. 8)

• When the gear room is cleaned up, apply 11g Makita
grease N No.2 into Gear case assembly from the grease
inlet. (See Fig. 7)

Fig. 11

Arbor press

Cutter shaft complete

Gear case assembly

U-shape table
of Arbor press

Ball bearing
6201DDU

1R031

Ball bearing
629ZZ

Repair

[4] DISASSEMBLY/ ASSEMBLY
[4]-5. Control lever assembly

ASSEMBLING

See Fig. 12.
(1) Hook Control cable to Throttle lever.
Assemble Switch lever and Leaf spring to Switch cover.
(2) Assemble Throttle lever, Lock off lever and Switch cover to
Lever case L in order while setting the following parts in place:

• Torsion spring 11 to Throttle lever

• Torsion spring 7 to Lock off lever

(3) Fix Control cable with Cable holder when setting Control
cable in place as drawn in Fig. 13.

Fig. 13

Fig. 12

Lever
case L

P 5/ 15

Torsion spring 11

Switch cover

Throttle lever

Lever case L

Cable holder

Torsion

spring 7

Control cable

Lock off lever

[4]-6. Clutch

DISASSEMBLING

Note: • Clutch can be easily removed with Impact driver without holding the piston.

• Do not remove Spark plug as compressed air resistance has to be used for the disassembling.

• Plug cap with Plug cap spring has to be removed from Spark plug.
(1) Remove the clutch section by unscrewing two M8 shoulder hex bolts.
Then, remove M6x14 Hex head bolt with Impact driver. (Fig. 13)
(2) Install 1R364 on Holder then screw two bolts into Holder as drawn in Fig. 14

instead of M8 Shoulder hex bolts. Holder is removed from Engine.

Fig. 13

M8 Shoulder hex bolt (2pcs.)

Clutch section

M6x14 Hex head bolt

Fig. 14

1R364

M8 bolts
(the components of 1R364)

Switch lever

Holder

ASSEMBLING

(1) After putting the clutch section (two Clutch shoes and two Springs), two Wave washers 10 and two Flat washers 6
on Holder, tighten them with two M8 shoulder hex bolts. (Fig. 15)
Note: Face the marking of “ ” to the outside as drawn in Fig. 15A.
(2) Put the assembled part, Flat washer, Spring lock washer and M6x14 Hex head bolt on the crank shaft of Engine,
then tighten the bolt to 12 N·m with 1R219, 1R220 while inserting 1R155 into Spark plug hole to lock Piston
to prevent the rotation of the crank shaft. (Fig. 16)

Fig. 15

M8 Shoulder hex bolt

Wave washers 10

Clutch section

Flat washers 6

Holder

Fig. 15A

marking of “ ”

Fig. 16

M6x14 Hex head bolt

Spring lock washer

Flat washer

P 6/ 15

Repair

[4] DISASSEMBLY/ ASSEMBLY
[4]-7. Clutch drum complete

DISASSEMBLING

(1) Remove M6x14 Hex head bolt and Flat washer 6 from Clutch drum complete while inserting Hex wrench into
Gear case assembly and pretighten Receive washer and Clamp washer with M10 Nut to prevent the rotation of
Shaft complete. (Figs. 17 and 18)
(2) Unlock Retaining ring R-35 in the groove of Clutch case complete with 1R006 through the hole of Clutch drum
complete. (Fig. 18)
(3) Tap the corners of Clutch case complete carefully with Plastic hammer to remove Clutch drum complete. (Fig. 19)
(4) Separate Damper and Shaft complete from Clutch drum complete. (Fig. 20)
(5) Remove Retaining ring S-17 from Clutch drum complete with 1R004. (Fig. 21)
(6) Remove Ball bearing 6003LLU from Clutch drum complete with 1R022, 1R023 and Arbor press. (Fig. 22)

Fig. 17

Hex wrench

Clamp washer

Plastic
hammer

Clutch drum
complete

Fig. 22

Gear case assembly

Receive washer

M10 Nut

Clutch case complete

Fig. 20

Fig. 18

Hole of Clutch
drum complete

Flat washer 6

M6x14
Hex head bolt

Clutch drum complete Clutch case complete

Fig. 21Fig. 19

Clutch drum complete

Shaft complete

DumperClutch drum complete

Retaining ring
R-35

Retaining ring
S-17

Groove

1R023

1R022 Arbor press

Ball bearing 6003LLU

Ball bearing 6003LLU

Retaining ring R-35

Clutch drum complete

P 7/ 15

Repair

[4] DISASSEMBLY/ ASSEMBLY
[4]-7. Clutch drum complete (cont.)

ASSEMBLING

(1) After putting Retaining ring R-35 on the center of Clutch drum complete, pressfit Ball bearing 6003LLU in place of
Clutch drum complete with 1R028. (Fig. 23)
Fit Retaining ring S-17 into the groove of Clutch drum complete with 1R004. (See Fig. 21)
(2) Assemble Shaft complete with Damper to Clutch drum complete so as to mate the connecting portions of Shaft
complete and Clutch drum complete in Damper. (Fig. 24)
Assemble the assembled part to Clutch case complete by tapping the center of Clutch drum complete carefully with
Plastic hammer. (Fig. 25)
(3) Fit Retaining ring R-35 into the groove of Clutch case complete with 1R006 through the hole of Clutch drum complete,
then set M6x14 Hex bolt and Flat washer 6 on Clutch drum complete while inserting Hex wrench into Gear case
assembly and pretighten Receive washer and Clamp washer with M10 Nut to prevent the rotation of Shaft complete.
(See Figs. 18 and 17)

Note: Apply ThreeBond 1342/ Loctite 242 to the thread of M6x14 Hex bolt.

Fig. 23

1R028

Fig. 24

Retaining ring R-35

Retaining ring S-17

Connecting portion of Clutch drum
complete

Retaining ring R-35

Ball bearing
6003LLU

Connecting portion of
Shaft completeDamperBall bearing 6003LLU

Fig. 25

Clutch drum complete Clutch case complete

Plastic hammer

Clutch drum complete

P 8/ 15

Repair

[4] DISASSEMBLY/ ASSEMBLY
[4]-8. Ignition

CHECK OF PLUG CAP (SPRING)

(1) Remove Plug cap from Spark plug, then detect the continuity between Plug cap spring in Plug cap and Earth terminal
of Ignition coil.
It is the normal condition when Tester shows 2.45kΩ±10%. (Fig. 26)
(2) In case of no continuity or unstable continuity, check the connection between Plug cap spring and Ignition coil as follows:
(A) Spray the lubricant in Plug cap, then pull out Plug cap spring together with Ignition cable using Pliers. (Fig. 27)
(B) In case no connection or inconsistent connection, then check the condition of Plug cap and Plug cap spring.
Reassemble them or replace them if they are disorder.
(C) Insert the end of Plug cap spring into Ignition cable then return them back to the inside of Plug cap carefully so as
not to be disconnected.
(D) Check Plug cap and Plug cap spring again according to the step of (1) to avoid poor connection causing the poor
sparks of Spark plug.

Fig. 26 Fig. 27

Plug cap

Tester

Plug cap spring

Pliers

Earth terminal

CHECK OF SPARK PLUG

(1) Remove Plug cap with Plug cap spring from Spark plug, then remove
Spark plug with Wrench 17-19 (standard equipment).
Note: When the spark area is wet with Fuel, wipe it away with a cloth and dry it
by air blow.
(2) Clean carbonized materials on Insulated part for sparking with a wire brush.
(3) Do fine adjustment of Spark plug as drawn in Fig. 28.

Insert 0.7mm thickness gauge of 1R366 to the clearance and adjust the leg of

Spark plug carefully.
(4) Install Plug cap with Plug cap spring on Plug and connect the plug screw part
to a metal part of Engine, then pull Starter rope slowly.
The sparks can be seen when starter rope is pulled.
(5) When the sparks can not be seen, refer to “CHECK OF PLUG CAP (SPRING)”
in this page to detect the continuity. If required, replace Plug and recheck the sparks
through the above process.

Ignition cable

Fig. 28

0.6 up to 0.7 mm

P 9/ 15

Repair

[4] DISASSEMBLY/ ASSEMBLY
[4]-8. Ignition (cont.)

REMOVING OF IGNITION COIL

(1) Remove M5x50 Hex socket head bolt and two M5x22 Hex socket head bolts (with washers and super lock washers)
and four M5x14 Pan head screws (with washers and spring lock washers), and then separate Blower housing,
Muffler cover and Cylinder cover from the machine. (Figs. 29 and 30)
(2) Before removing Ignition coil, pull out
Cable terminal. (Fig. 31)
(3) Remove two M5x22 Hex socket head bolts

to separate Ignition coil from Crank case
assembly. (Figs. 31 and 32)

Fig. 29

M5x50 Hex socket
head bolt

Blower housing

(See Fig. 30 for
the appearance
viewed from
Cylinder cover.)

Recoil starter
assembly

Fig. 30

Cylinder cover

M5x14 Pan head
screw (2 pcs.)

M5x14 Pan head screw

ASSEMBLING OF IGNITION COIL

See Fig. 32.
(1) While attaching 0.45mm thickness gauge of 1R366 to
the magnet portion of Flywheel, set Ignition coil in place.
(2) Remove the thickness gauge.
Then, turn Flywheel by hand to check whether it turns smoothly
without being stuck.

Muffler cover

M5x22 Hex socket
head bolt (2 pcs.)

Fig. 31

Cable terminal

M5x22 Hex socket head bolt (2 pcs.)

Fig. 32

M5x22 Hex socket head bolt

Muffler cover

M5x14 Pan head screw

Ignition coil

Flywheel

Ignition coil

Crank case
assembly

0.45mm thickness
gauge of 1R366

Flywheel

P 10/ 15

Repair

[4] DISASSEMBLY/ ASSEMBLY
[4]-9. Flywheel

Note: • Flywheel can be easily removed with Impact driver without holding the piston.

• Do not remove Spark plug as compressed air resistance in Cylinder has to be used for the disassembling.

• Plug cap with Plug cap spring has to be removed from Spark plug to prevent Engine from running.

DISASSEMBLING

(1) Turn M6x16 Hex socket head bolt on the center of Flywheel counterclockwise using Cordless impact driver. (Fig. 33)
(2) Install 1R364 on Flywheel then screw two M6 bolts of 1R364 into Flywheel as drawn in Fig. 34.

Flywheel is removed from Engine.
Important: Screw two M6 bolts evenly.

Fig. 33 Fig. 34

M6x16 Hex socket head bolt

1R364

Thread holes to screw
M6 bolts of 1R364
(Refer to Fig. 31.)

ASSEMBLING

(1) Wipe off the grease and oil from Crank shaft. (Fig. 35)
(2) Put Woodruff key 3 into Crank shaft, then align the key
groove of Flywheel to Crank shaft with the key. (Fig. 35)
(3) Screw M6x16 Hex socket head bolt with Spring lock washer
to Crank shaft by turning them clockwise by hand.
(4) Tighten M6x16 Hex socket head bolt about two seconds
using Cordless impact driver.

Screwdriver

M6 bolt of
1R364
(2 pcs.)

Fig. 35

Key groove of Flywheel’s hole

Woodruff key 3

Wipe off the grease and
oil from Crank shaft.

Crankshaft
(in Crank case assembly)

P 11/ 15

Repair

[4] DISASSEMBLY/ ASSEMBLY
[4]-10. Recoil starter assembly

DISASSEMBLING

(1) Remove Recoil starter assembly from Engine by unscrewing four
M5x14 Pan head screws.
(2) Pull the rope one turn of Reel, then, Hook the rope with the notch of
Reel and turn the reel clockwise until Spiral spring loses the tension.
(Fig. 36)
Note: Be careful. Reel is revolved by the recoil force of Spiral spring.
(3) Loosen M6x20 Tapping screw to disassemble Recoil starter
assembly. (Fig. 37)
Note: Be careful when removing this screw as there is a possibility that
Spiral spring pops out.
(4) Untie the knot of the rope in Reel and remove the rope from Reel.

ASSEMBLING

(1) When Spiral spring pops out of Reel:

- Set the one end of Spiral spring in the hook on the periphery side in the Reel.

- Rewind the spring counterclockwise toward the center of circle. (Fig. 38)
(2) Apply a little amount of Makita grease N No.2 to the spring.
(3) Make a knot on the new rope end and pass it through Reel and Base of
Starter case assembly, then connect the other end to Starter knob. (Fig. 39)
Refer to Fig. 40 how to make a knot of the rope.
(4) Wind the rope around Reel two or three turns.
(5) While turning Reel counterclockwise, fit it into the base of Starter case
assembly and set Spiral spring end into the hook on inside of the base.
(Figs. 39)
Note: This should be fixed without force.
(6) Secure Reel with M6x20 set screw. (Fig. 37)
Swing arm has to be passed through the groove of Reel.
Important: In case Reel turning is not smooth after tightening M6x20 Set screw, Reel is not properly fixed to Starter case.
Repeat the step (5) so that Reel can revolves smoothly even after M6x20 Set screw is completely tightened.
(7) Hook the rope in the notch of Reel while straining the rope, then turn Reel counterclockwise. (Fig. 41)
When the rope is removed from the notch, Reel winds the rope with spring recoil force. Repeat the step until
the rope slacks are cleared.

Fig. 36

M6x20
Set screw

Fig. 37

Fig. 38

M6x20

Reel

Tapping screw

Hook in Reel
for Spiral spring

Notch of Reel

Reel

Fig. 39 Fig. 40

Base of Recoil starter assembly

Fig. 41

Hook in Base of Recoil starter

Reel

assembly to assemble Spiral spring

Approx. 10mm

Approx. 10mm

Notch of Reel

Repair

[4] DISASSEMBLY/ ASSEMBLY
[4]-11. Air cleaner assembly, Carburetor

DISASSEMBLING

P 12/ 15

(1) Remove Air cleaner cover by unscrewing
M5x20 Pan head screw. (Fig. 42)
(2) Remove Element, then separate Air cleaner plate
from Carburetor by unscrewing two M5x14 Pan
head screws. (Fig. 42)
(3) Remove Control cable and Bullet terminals of
Lead wires as drawn in Figs. 1 and 2.
(4) Unscrew M5x5 Wing nut under Float body to
drain the gasoline in Carburetor. (Fig. 43)
(5) Pull out Fuel tube from the nipple Carburetor
with 1R311. (Fig. 44)
(6) Remove Carburetor from Engine by unscrewing
two M5x58 Pan head screws. (Fig. 45)

Fig. 43 Fig. 45Fig. 44

Carburetor

Float body

M5x5
Wing nut

Tray to receive
Grease

Fig. 42

M5x14 Pan head
screw (2 pcs.)

Fuel tube

Nipple of
Carburetor

1R311

Air cleaner plate

Air cleaner cover

M5x20 Pan head screw

Element

Carburetor

M5x58
Pan head
screw (2 pcs.)

P 13/ 15

Repair

[4] DISASSEMBLY/ ASSEMBLY
[4]-11. Air cleaner assembly, Carburetor (cont.)

REPLACING/ MAINTENANCE OF CARBURETOR

See Fig. 46 for the all components of Carburetor.
(1) Push Jet needle against Spring while holding Piston valve. Spring plate is unlocked and removed.
Check whether the engagement of E-ring to the groove of Jet needle is loose or not.
If yes, replace Jet needle with a new one. (Refer to the drawings in the dotted circle in Fig. 46 and Fig. 49.)
(2) Unscrew two M4x16 Pan head screws, then remove Float body.
(3) Remove Straight pin from Float arm, then remove Float arm. Needle is removed.
When the pointed top of Needle gets worn/ looks offset as drawn in Fig. 47, replace it with a new one.
(4) Remove Main jet with slotted screwdriver as drawn in Fig. 48.
Clean the hole with a commercial carburetor cleaner or replace the main jet with a new one when it is clogged with
something.
(5) Clean the routes in Carburetor with a commercial carburetor cleaner.
After minutes from the step (5), blow away the liquid on the routes with a air gun.
(6) Assemble the above parts of Carburetor by reversing the disassembling procedure. Be careful to the order and
direction of parts and the following points.

• Jet needle has five grooves for E-ring. The third groove is factory-assembled position to set E-ring in Carburetor.
The adjustment on the proper ratio of Gasoline/ Air is necessary in accordance with the temperature fluctuation,

change the position to another. (Fig. 49)

• Align the groove of Piston valve with the projection in the hole on Body, then insert Piston valve into the hole of
Body. The misalignment causes the incomplete setting of Mixing cap because Piston valve gets deformed through

the hole of Body. (Fig. 50) After setting E-ring on Jet needle, put the E-ring between two Packings, then install
their assembled parts into Piston valve and the last, secure all the parts with Spring plate.

• Set Float in place so that the upper surface face upward. Be careful to the mark “UP”. (Fig. 51)

Fig. 46

(Hole on Body)

Filter

Gasket

Cock body
complete

Pan head
screw

M4x16 Pan head
screw (2 pcs.)

Fig. 49 Fig. 50 Fig. 51

Straight pin

Hose

Plate

Spring

Main jet

Needle

Float arm

Float

Gasket

Float body

O ring

M5x5
Wing nut

Adjust screw

Adjuster
cable

Nut

Cable guide

Cap

Mixing cap

Spring

Spring plate

Packing

E-ring

Jet needle

Packing

Piston valve

Cap

Control cable
(It doesn’t include
Carburetor. )

Fig. 47

The pointed top of Needle:

gets worn looks offset

The above needles are not

acceptable.

The following is normal.

Fig. 48

Main jet

Slotted
screwdriver

Light gasoline-ratio

The third groove

on Jet needle

Rich gasoline-ratio

Relation between E-ring position on

Jet needle and Gasoline/ Air ratio

Projection

Groove of

Piston valve

UP mark

Float

Repair

[4] DISASSEMBLY/ ASSEMBLY
[4]-12. Engine block

P 14/ 15

DISASSEMBLING

(1) It is highly recommended to drain the oil system of Engine block

before starting disassembling because the oil remaining there will
drip out to delay your operation.

(2) From the engine section, remove the following parts:
Cylinder cover, Fuel tank, Blower housing, Muffler cover, Recoil starter
section, Clutch section, Ignition coil, Flywheel section, Insulator section,
Air cleaner assembly, Carburetor, Spark plug, Exhaust muffler

(3) Remove Cylinder. (Fig. 52)
(4) Remove two clips from ends of Piston pin with a pointed tool such as
an awl. (Fig. 53)
Note: • Be careful with Clip because it can pop out unexpectedly
during removal operation.

• Do not reuse removed Clips. Replace them with new ones.
(5) Remove Piston pin with 1R200 or the like. (Fig. 54)

(6) Remove Piston.

Fig. 53 Fig. 54

Awl

Clip

Piston pin

Clip

Piston

Fig. 52

Cylinder

Crank case

assembly

Crankshaft

assembly

1R200

ASSEMBLING ENGINE BLOCK

Assemble by reversing the disassembly procedure. Be careful to
the following points.

• “M mark” on Piston has to face Flywheel side. (Fig. 55)

Note: Be sure to apply a little amount of 2-stroke engine oil
to Needle cage 1014 of Crank shaft assembly.

• Insert Piston pin through Piston and Crank shaft, and fix it with
Clips by using an awl (Refer to Fig. 53. Clip has no direction).

• Piston rings have their directions. Their gaps must be put on
the farthest side and one of the gap of Piston ring must be set
by the boss on the groove of Piston ring as drawn in Fig. 56.
Note: Piston rings are easy to break. Do not enlarge them too

much when fixed.

• Apply 2-stroke engine oil to the internal surface of Cylinder
before assembling it to Crankcase assembly. And then,
Assemble Cylinder gasket while aligning its square hole to

that of Cylinder.

• Assemble other parts by reversing the disassembly procedure.

Fig. 55

Piston

Crank case

assembly

Fig. 56

“M mark” on Piston

Flywheel

Boss on groove of Piston

Gap of Piton ring

The gap of this piston ring
is at the farthest side from here.

Repair

[4] DISASSEMBLY/ ASSEMBLY
[4]-13. Stop switch

CHECKING STOP SWITCH

Check the continuity between the bullet terminals on the two lead wires
extending from Control lever with a circuit tester. (Fig. 57)
If Stop switch functions properly,
there will be no continuity with the switch ON
and there will be continuity with the switch OFF.

P 15/ 15

Fig. 57

Tester

[5] Tightening torque specifications

Fastening for

Crank case assembly (Crank case 1 and Crank case 2) M5x30 Hex socket head bolt (with washer)

Cylinder and Crank case assembly M6x18 Hex socket head bolt 12.5

Muffler and Cylinder

Insulator and Cylinder

Ignition coil and Cylinder

Plate of Air cleaner assembly and Insulator

Recoil starter assembly and Blower housing

Blower housing and Crank case assembly

Cylinder cover and Blower housing

Cylinder cover and Crank case assembly

Muffler cover and Cylinder cover 3.5

Spark plug and Cylinder M14 Spark plug 15.0

Flywheel and Crankshaft assembly

Clutch assembly (Clutch shoe and Holder) M8 Shoulder hex bolt 12.0

Holder of Clutch assembly and Crankshaft assembly M6x14 Hex head bolt 11.5

Gear case assembly and Pipe shaft complete

Clutch drum complete and Shaft complete M6x14 Hex head bolt 11.0

Hanger and Clutch case complete

Shaft pipe complete and Holder, Handle ass’y M6x30 Hex socket head bolt (with washer) 6.0

Stopper and Clutch case complete M6x35 Pan head screw 5.0

M6x60 Hex socket head bolt 11.5

M5x25 Hex socket head bolt
(with washer and spring lock washer)

M5x22 Hex socket head bolt 5.0

M5x50 Hex socket head bolt 3.5

M5x14 Pan head screw
(with washer and spring lock washer)

M5x50 Hex socket head bolt 3.5

M5x22 Hex socket head bolt (with washer) 3.5
M5x14 Pan head screw

(with washer and spring lock washer)
M5x20 Pan head screw

(with washer and spring lock washer)
M5x14 Pan head screw

(with washer and spring lock washer)

M6x16 Hex socket head bolt (with spring
lock washer)

M6x30 Hex socket head bolt
(with washer and spring lock washer)

M5x12 Hex socket head bolt
(with washer and spring lock washer)

M6x28 Hex head bolt
(with washer and spring lock washer)

Description

Fastening torque

(N.m.)

7.5

4.0

3.5

3.5

3.5

12.5

8.5

3.0

8.0