Makita EM4251 Service Manual Page 42
- Page / 48
- Table of contents
- BOOKMARKS
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P 39 / 45
8 - 2 - 1 Precautions
8 - 2 - 2 Procedures for disassembling and reassembling
8 - 2 - 3 Precautions for inspection
8 - 2 - 4 Marks punched on the carburetor
(1) Wash carburetor with clean gasoline before assembling.
(2) Disassemble and reassemble carburetor by referring to the exploded view.
(3) Refrain from disassembling throttle valve assembly. (6) and the main unit.
(1) Remove the screw (25) and primer pump cover (24). At that time, remove dust or foreign material stuck
on primer pump (23), if any.
(2) Remove pump body assembly (13) from the main unit (at that time, be careful, not to lose the
spring (15). Remove dust or foreign materials caught in inlet screen (14), if any.
(3) Remove jet (19) from the main unit.
(4) Remove the screw (1) and remove throttle valve assembly (6) from the main unit.
(5) When installing carburetor, , make sure that jet (9) and the spring (12) have been firmly installed.
(1) Wash the main unit with the gasoline for cleaning and blow it with air compressor.
(2) Check jet for dust particles stuck on the surface, corrosion, etc. If there is dust particle stuck on jet,
wash it and blow it clean with air compressor. It jet is corroded, replace it with a new one.
(Note) when replacing jet, be sure of using a new one with the same number.
(3) Check gasket for deformation and damage. If it is deformed or damaged, change with a new one.
(4) The pump (diaphragm) should not be hardened nor damaged.
(5) Inlet valve and outlet valve should be flat and not bent.
(6) Diaphragm assembly should be free of any hardening, damage or bent plate.
(7) After assembling pump body assembly, check it for deformation of metering lever and metering spring,
height of metering lever, dust particles stuck on inlet screen, valve leakage, etc. To check main check
valve for correct operation, connect a vinyl or rubber hose to the jet side and breathe it with your
mouth. If jet stops when blown and closes when sucked, the valve is working normally. If there is any
abnormality, immerse it in gasoline for approximately 10 minutes and then blow and suck it repeatedly.
It the valve can not be fixed even by doing so, replace it with a new pump body assembly.
(Note) Refrain from blowing the main check valve unit with air compressor. When using an ir gun,
keep them approximately 30 cm apart of each other when the compressed air has a pressure
of 6 kg/cm2.
(8) Check primer pump for any hole, damage or abnormal hardening. Make sure that combination valve is
working normally.
Marks are stamped as shown in the figure at the right.
(1) Model No.
(2) Date of production
1
2
Fig. 8 - 3
- Model: EM4250, EM4251 1
- CONTENTS - 1/2 2
- CONTENTS - 2/2 3
- 1. SPECIFICATIONS OF ENGINE 4
- 2. PERFORMANCE 5
- MAXIMUM TORQUE 6
- MAXIMUM HORSEPOWER 6
- RECOMMENDABLE 6
- HORSEPOWER RANGE 6
- FUEL CONSUMPTION 6
- 3. FEATURES 7
- P 5 / 45 8
- P 6 / 45 9
- Fig. 3-2 9
- Fig. 3-3 9
- P 8 / 45 11
- 4 - 4 Piston Rings 11
- 4 - 5 Cam Gear 11
- 4 - 6 Cooling System 11
- 4 - 7 Lubrication System 11
- 4 - 10 Air Cleaner 12
- 4 - 11 Decompression System 12
- P 9 / 45 12
- 4 - 8 Ignition System 12
- 4 - 9 Carburetor 12
- P 12 / 45 15
- P 13 / 45 16
- Return Pipe 16
- Fig. 5-7 16
- Fig. 5-8 16
- P 15 / 45 18
- P 16 / 45 19
- Recoil side 20
- P 18 / 45 21
- P 20 / 45 23
- P 21 / 45 24
- P 22 / 45 25
- P 23 / 45 26
- P 24 / 45 27
- P 25 / 45 28
- 5 - 3 - 4 Oil Case 28
- P 26 / 45 29
- 5 - 3 - 5 Oil Case 29
- 5 - 3 - 6 Ignition coil 29
- 5 - 3 - 7 Blower housing 29
- <Note> 29
- P 27 / 45 30
- 5 - 3 - 8 Cam gear 30
- P28 / 45 31
- 5 - 3 - 10 Cam gear cover 31
- Fig. 5 - 41 32
- P 31 / 45 34
- 6. MAGNETO 38
- P 36 / 45 39
- 7 - 2 Inspection 39
- 8. Carburetor 40
- P 38 / 45 41
- P 39 / 45 42
- 8 - 2 - 1 Precautions 42
- 9. Recoil starter 43
- 9 - 2 Reassembling 44
- P 42 / 45 45
- 9 - 4 Other guides 45
- 10. Trouble shooting 46
- 11. Installation 47
- P 45 / 45 48
- 11 - 3 Exhaust gas discharge 48
- 11 - 4 - 1 Belt drive 48
- 11 - 4 - 2 Flexible coupling 48
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