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PRODUCT

C

ONCEPT AND MAIN APPLICATIONS

 

S

pecification

P  1/ 

19

Models No.

EK7650H, EK7651H

 Description

Power Cutters 305mm (12"), 355mm (14")

Models EK7650H and EK7651H are the world’s first 4-stroke power cutters. 

Their main features are:

 • Low fuel consumption, low noise and clean exhaust emission achieved

   by 4-stroke engine 

 • Easy start-up with Automatic decompression, Primer pump and

   On/off choke combination switch with automatic half-throttle lock 

 • Low-vibration system with damper springs to absorb vibration from

   engine to integrated front and rear handles.
Each wheel diameter is:

305mm (12") for model EK7650H

355mm (14") for model EK7651H

Dimensions: mm (")

Width (W)
Height (H)

Length (L)

310 (12-1/4)

780 (30-3/4)

EK7651H

435 (17-1/8) 455 (17-7/8)

761 (30)

EK7650H

355 (14)

1.1 (37.2)

75.6 (4.6)

3.0 (at 7,500 min.

ˉ

¹)

Fuel tank capacity: L (US oz)

Fuel consumption: L/h (US oz/h)

Wheel diameter: 

mm (")

Engine

Displacement: cm³ (cu.in)

Max. output: kW

4.6 (at 5,500 min.

ˉ

¹)

Max. torque: N.m

4-stroke

Specifications

EK7651H

Model

Type

Decompression valve

Rapid start

(Spring-assisted recoil starter)

Starting

system

122 (4-13/16)

Max. cutting depth: 

mm (")

Dry weight

*

2

: kg (lbs)

*1

 Some countries: E10 or E25 gasoline

*2

 without cutting wheel

12.9 (28.4)

12.7 (28.0)

S

tandard equipment

Note:

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

Tool kit (Socket wrench 13-16, Hexalobular wrench, Slotted screwdriver and Tool bag)

Oil bottle (containing 220ml engine oil)

Water supply kit

Adapter ring (for some countries only)

305 (12)

EK7650H

97 (3-13/16)

1.7 (57.5)

No

Automatic (

Mechanical)

Engine oil

Fuel

Straight unleaded gasoline

*

1

SAE10W-30 oil

in the class SF or higher of API Classification

O

ptional accessories

Filter set

Trolley kit

Oil bottle set (10 bottles of 220ml engine oil)

Diamond wheel

Abrasive cut-off wheel

T

ECHNICAL INFORMATION

Summary of Contents for EK7650H

Page 1: ...nk capacity L US oz Fuel consumption L h US oz h Wheel diameter mm Engine Displacement cm cu in Max output kW 4 6 at 5 500 min Max torque N m 4 stroke Specifications EK7651H Model Type Decompression v...

Page 2: ...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 part...

Page 3: ...h the holes of Cylinder head assembly Repair Inner periphery a little Makita grease N No 2 Inner periphery Oil seal 17 Cam lifter R Crankshaft complete Oil seal L P 3 19 109 112 117 Cylinder head comp...

Page 4: ...ate Belt cover and Hood section from the machine Fig 4 5 When Hood section is disassembled 1 Face the blade installation side of Spindle toward the ram of Arbor press 2 Press Spindle out of Cutting de...

Page 5: ...ers 3 Insert Lock shaft into the place of Cutting device then set Sliding disc and Impact plate Push Lock shaft from Belt cover side toward Blade installation side until the top bumps against Impact p...

Page 6: ...e one end through Starter knob and Rope stopper tie the end as drawn in Fig 14 Then cover the top of Starter knob with Cap After passing the other end from the hole of Starter case to Reel tie the end...

Page 7: ...om being rotated Fig 21 3 Turn Flywheel slowly and carefully by hand until the top of 1R372 contacts Piston Note Do not damage Piston 4 Turn the hexagonal portion of Clutch holder counterclockwise wit...

Page 8: ...G FLYWHEEL COMPLETE ASSEMBLING FLYWHEEL COMPLETE Fig 23 Fig 24 Fig 25 M10 Flange nut Flywheel Crankshaft 14mm flats width Socket bit Screwdriver Water pump pliers Woodruff key in key way of Crankshaft...

Page 9: ...to apply the principle of leverage Without being forced to pull put the long noses of Pliers on the edge of Ignition coil and lever up the flag terminal Fig 31 5 Loosen two M5x16 Hexalobular socket he...

Page 10: ...on for compliance with standards 5 Before mounting the inner parts of Pump body assembly in place make sure that the tip of Inlet needle valve is neither worn nor deformed Note The inner parts are not...

Page 11: ...Assemble by reversing the disassembly procedure Be careful to the following points Align the ends of Sponge sleeve 9 and Breather on Tube 3 190 Fig 39 Set Breather in place so that Tube 3 190 is fixe...

Page 12: ...ed it is necessary to remove Engine from Tank complete 1 Remove Hood section Refer to Fig 4 of 4 1 2 Remove Carburetor Refer to 4 5 Refer to Fig 45 and do the following steps 3 4 5 3 Remove three Tube...

Page 13: ...bular socket head bolts that fasten Front handle Tank complete and Engine Fig 46 Engine block can be removed Fig 47 Viewed from Blade installation side Viewed from Starter assembly installation side E...

Page 14: ...complete from Cylinder head complete Fig 50 7 Loosen Hose clamp then remove Suction line from Cylinder head complete Refer to Fig 41 8 Remove Cylinder head complete from Cylinder block then pull out t...

Page 15: ...ith 1R308 and remove Rocker arms Refer to Figs 50 and 54 2 Remove Spark plug Turn Flywheel until Piston comes to the upper dead point by looking through Spark plug hole on Cylinder head complete Note...

Page 16: ...cket head bolts on the bottom of Crank case Fig 58 then remove Crank case from Cylinder block As Liquid gasket makes Cylinder block stick on Crank case insert and twist a slotted screwdriver between t...

Page 17: ...ng by placing Second ring with the red marking on your right and with the ring gap near you as shown in Fig 65 If both of the two rings are used and the white marking of Second ring is rubbed off care...

Page 18: ...rank portion two or three turns check the gap again if the proper gap is obtained tighten the nuts and bolts firmly 12 Lead unit that comes from Stop switch has to be fastened to Cylinder block with 6...

Page 19: ...ted place 7 If spark is not produced replace Spark plug with a new one then check for spark by following the procedure 1 to 6 once again WARNING When a spark is produced high voltage current is delive...

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