Zenoah HB2311EZ Workshop Manual Download

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6. Carburetor

6-1 Specifications

Model Carburetor

(Walbro)

Carburetor Specifications

Seal (L-needle)

Sales Region

Blower

Model

Engine

Type

Name

Part

Number

Part Name

Part Number

Adjustment angle

(L-needle return

angle)

Adjustment angle

(H-needle return

angle)

Main Jet

Venturi Bore

(Lead Air)

mm (in.)

Venturi Bore

(Mixture Air)

mm (in.)

Choke Bore

mm (in.)

Metering Lever

Height

mm (in.)

Valve Opening

Pressure

kg/ cm

(kpa)

Valve Closing

Pressure

kg/ cm

(kpa)

EU/ General

HB2302

G23L

WYJ-110A

5516-81000

Limiter Cap 848-F40-80D0

Adjustment

FIXED

# 38

―

9 (0.354)

17 (0.669)

1.5

0.16

(0.059

0.006)

1.3

～

2.3

0.6

～

1.6

EU/ General

HBZ2601

GZ25N

WYA-26E 848-F3C-8102

↑

# 37.5

8 (0.315)

9 (0.354)

13.2 (0.520)

↑

USA

HBZ2601

↑

WYA-65

848-F3U-8100

↑

1 3/4

1/2

―

9 (0.354)

7 (0.276)

13.2 (0.520)

↑

USA/ EU/

General

EBZ3000/ RH

GZ30N

WYA-73B 848-F6B-8101

↑

FIXED

# 34

9 (0.354)

7 (0.276)

13.2 (0.520)

↑

General

EB4300

G4K

WYK-67A

3407-81000

↑

# 60

―

13.5

17 (0.669)

↑

EU/ General

EBZ4800

GZ48N

WYA-51B 848-L38-8100

↑

# 45

10.5 (0.413)

14.5 (0.571)

↑

GZ51N3.5

WYA-74A 848-HE0-8100

USA

EBZ5100/ RH

GZ51N6

WYA-79

848-HE2-8100

↑

# 44

10.5 (0.413)

14.5 (0.571)

↑

USA EBZ5100Q

GZ51N7

WYA-83 848-HE6-8100

↑

# 41.5

10.5 (0.413)

14.5 (0.571)

↑

General

EB6200

G62L

WYK-73A

2750-81000

↑

# 59

―

15 (0.591)

17 (0.669)

↑

EU/ General

EB7000

↑

WYK-123A T4012-81000

↑

―

15 (0.591)

17 (0.669)

↑

USA

EBZ7100/ RH

GZ65N

WYA-81

848-H18-8100

↑

# 57

13.5 (0.532)

12.2 (0.480)

14.5 (0.571)

↑

USA/ EU/

General

EBZ8001/ RH

GZ72N

WYA-44B 848-H00-8100

↑

# 59

13. 5 (0.532)

12.2 (0.480)

14.5 (0.571)

↑

Model

Adjustment Angle for Engine Start

(Loosen then tighten)

Engine Speed (rpm)

Standard Engine Speed (rpm)

Sales Region

Blower

Model

Engine

Type

Throttle

Valve Adjust

Screw

L-needle

Adjustment

Angle

H-needle

Adjustment

Angle

ID Peak

Engine

Speed

ID Rich

Down

Set ID

Engine

Speed

H Rich

Down

Set H

Engine

Speed

Idling

Full Throttle

(Standard Pipe)

Remarks Recommended

Tools

EU/ General

HB2302

G23L

FIXED

3400

1000

～

1200 2300

100

FIX JET

2300

200

7300

～

7600

EU/ General

HBZ2601

GZ25N

8 1/2

12 1/2

↑

3700

10 800

～

1000 2800

100

↑

2800

200 7700

～

7990

USA

HBZ2601

↑

8 1/2

13 1/2

1 7/8

3900

1000

～

1200 2800

100

～

100

7300

2800

200

7300

～

7800

USA/ EU/

General

EBZ3000/ RH

GZ30N

8 1/2

FIXED

3500

10 400

～

100 3000

100

FIX JET

3000

200 6300

～

6800

General

EB4300

G4K

4 1/2

10 1/2

↑

2700

600

～

800

2000

100

↑

2000

200

6150

～

6550

EU/ General

EBZ4800

GZ48N

11 1/2

↑

3400

10 1000

～

1200

↑

GZ51N3.5

11 1/2

3000

700

～

900

USA

EBZ5100/ RH

GZ51N6

↑

2900

600

～

800

2200

100

↑

2200

200

5820

～

6100

Digital magneto controlled misfire

for excessive speed

Maximum speed: 8500 rpm

USA EBZ5100Q

GZ51N7

3 1/2

↑

2900

10 600

～

800 2200

100

↑

2200

200 5520

～

5800

General

EB6200

G62L

10 1/2

↑

2500

400

～

600

2000

100

↑

2000

200

7500

～

7800

EU/ General

EB7000

↑

7 10

1/2

↑

2700

10 600

～

800

↑

7100

～

7500

USA

EBZ7100/ RH

GZ65N

↑

2700

600

～

800

2000

100

↑

2000

200

6850

～

7150

Digital magneto controlled misfire

for excessive speed

Maximum speed: 8500 rpm

USA/ EU/

General

EBZ8001/ RH

GZ72N

6 1/2

↑

2700

10 600

～

800 2000

100

↑

2000

200 6500

～

6800

Digital magneto controlled misfire

for excessive speed

Maximum speed: 8500 rpm

①

3699-90345

Carburetor Conditioner

④

848-8W9-0080

Limiter Cap Tool

②

3699-90211

Leak Tester

③

3699-90537

Tachometer PET-1000

Summary of Contents for HB2311EZ

Page 1: ......

Page 2: ......

Page 3: ...enance tasks Frequently asked questions are also included in this manual However many cases need rich maintenance experience and informed judgment Please refer to this manual for maintenance support N...

Page 4: ...41 5 cm3 47 9 cm3 50 2 cm3 62 0 cm3 64 9 cm3 71 9 cm3 Engine Type G23L GZ25N GZ30N G4K GZ48N GZ51N G62L GZ65N GZ72N JAP HB2311EZ EBZ3000 EB4300 EBZ4800 EB7001 General HB2302 HBZ2601 EBZ3000 EB4300 EB...

Page 5: ...o confirm engine type and blower model Engine Type G Z 25 N Engine series L N K Displacement cm3 Strato charged engine green engine Blower Model HB Z 26 01 Minor changed code Handheld Bower EB Z 71 00...

Page 6: ...ston Inserting Direction 24 4 9 Piston Pin Snap Ring Assembly 24 4 10 Positioning of Lead Air Intake Tube 25 4 11 Reed Valve Assembly 25 4 12 Gasket Assembly 26 4 13 Scavenging Duct Cover Assembly 27...

Page 7: ...ap Removal Installation 44 6 5 Idling Speed Adjustment 44 6 6 Carburetor Inspection 45 6 7 Carburetor Adjustment 47 7 Maintenance Standards 7 1 Engine 51 7 2 Tightening Torques 52 8 Troubleshooting 8...

Page 8: ......

Page 9: ...facturer s blower of the same class Large air cleaner employing models EB7000 EB7001 EBZ7100 EBZ8001 Volute Case Frame Guard Net Engine Centrifugal Fan Guard Net Open Vane Fan Closed Vane Fan Backpack...

Page 10: ...tion Timing rpm 24 6000 35 7000 37 7500 28 7000 35 7000 33 7000 35 7000 28 7000 34 7000 33 7000 Type RCJ6Y CMR7A CMR7H RJ6C CMR7H BPMR7A CMR7H Spark Plug Gap mm in 0 6 0 7 0 024 0 028 Type Primary coi...

Page 11: ...xible Pipe Swivel Joint Straight Pipe Silencer Pipe End Form Diameter D 87 3 43 87 3 43 94 3 70 99 5 3 92 70 2 76 70 2 76 80 3 15 61 2 40 74 2 91 80 3 15 74 2 91 61 2 40 73 2 84 73 2 87 79 3 11 79 3 1...

Page 12: ...4300 335 13 2 489 19 3 454 17 9 495 19 5 1222 48 11 EBZ4800 352 13 9 452 17 8 476 18 7 1248 49 13 EBZ5100 5100RH 5150 5150RH 401 15 8 483 19 0 441 17 4 495 19 5 1195 47 05 EBZ5100Q 5150Q 401 15 8 483...

Page 13: ...nance procedures categorized by type and series are explained below Each drawing includes information on parts such as mount screws and disassembly cautions How to use Procedure Handheld Blower HB23 S...

Page 14: ...emove the fan 4 Remove the extension using the wrench 5 Remove the four mounting screws separate the volute case and the engine short block Stopper HB23 Series HBZ26 Series Stopper Box Wrench 12 mm Mo...

Page 15: ...mm Disassembly Flowchart Air Inlet Net Spring Damper Frame Volute Cover Assy Engine Cover Below the procedure Volute Cover Assy Mounting Screw 8 TORX T27 M5 L25 Mounting Screw 3 Mounting Bolt 1 M5 L16...

Page 16: ...al tool into the plug hole 3 Remove the four mounting screws then remove the fan 4 Remove the four mounting screws separate the volute case and the engine short block Stopper Fan Mounting Bolt TORX T2...

Page 17: ...or recoil starter and fuel tank if necessary Disassembly Flowchart Air Inlet Net Frame Engine Cover Below the procedure Rotor Puller Assy Puller Bolt 8 mm Box Wrench 12 mm Mounting Nut 12 mm Hex Volut...

Page 18: ...hed but stays inside the volute cover assembly and the volute case 4 Remove the six mounting screws then remove the engine short block from the volute case 5 Remove the mounting nut using the box wren...

Page 19: ...4 k 0 3 0 4 0 012 0 016 EBZ3000RH 3050RH GZ30N USA Side 31 6 k Side 37 4 k 2 05 k 0 3 0 4 0 012 0 016 EB4300 G4K 0 17 k 1 4 k 0 3 0 4 0 012 0 016 EBZ4800 GZ48N EBZ5100Q 5150Q GZ51N 0 33 k 2 77 k 0 3 0...

Page 20: ...bstructive parts in order to see the rotor and the module Refer to 3 1 Rotor Removal 2 Insert a gauge special tool between the rotor magnet metal and module Tighten the mounting bolts while pushing th...

Page 21: ...otor Gauge 848 8W4 0050 T 0 4 mm EBZ5100 EBZ71 80 Series 1 Remove the module cover 2 Insert a gauge special tool between the rotor magnet metal and module Tighten the mounting bolts while pushing the...

Page 22: ...puller Puller 4500 96100 HBZ26 Series 1 Remove the recoil starter and the spark plug 2 Insert the stopper special tool to the plug hole Refer to 3 1 Rotor Removal 3 Engage the puller special tool to...

Page 23: ...according to the type of the rod assy Rod Assy 1101 96220 HB23 Series HBZ26 Series 1 Remove the engine short block refer to 3 1 Rotor Removal and then remove the cylinder 2 Remove the snap rings from...

Page 24: ...stic hammer to push out the pin Hard hammering may damage the big end of the connecting rod Rod Assy 2750 96230 EB6200 EB70 Series 1 Remove the engine short block refer to 3 1 Rotor Removal and then r...

Page 25: ...r pulley Never remove the starter pulley by hitting with a hammer Doing so may damage the pulley 4 2 Air Inlet Net Removal EB6200 EB70 Series EBZ4800 EBZ30 51 71 80 Series The air inlet net is mounted...

Page 26: ...rt of the volute to the frame to slacken the strap and then pull out the plate 4 Pull the strap out from the volute case 5 Remove the spring from the volute case then the spring holder The spring is e...

Page 27: ...aft Removal EBZ4800 EBZ30 51 71 80 Series Be sure to extract the key beforehand The precision fit between crankshaft and main bearings is very tight Be sure to use the press to remove the crankshaft N...

Page 28: ...they have seized replace the oil seal and bearings with new ones Be sure to use the press to remove the bearings Be sure to use the press to press the bearings out during bearing removal Without jig...

Page 29: ...ankcase Snap Ring Crank Case Construction Push the oil seal within 0 to 0 5 mm 0 02 in from the crankcase surface Oil Seal Fan Side Starter Side Bearing Push the bearings until they contact the crankc...

Page 30: ...not cover the lubrication hole with the snap ring Lubrication Hole Push the oil seal within 1 5 to 2 3 mm 0 06 to 0 09 in from the crankcase surface Oil Seal Bearing Push the bearings until they conta...

Page 31: ...the bearing Face the bearing identification mark mark is recessed toward the inside of the crankcase and then insert it Press the bearings from the outside of the crankcase using combined special tool...

Page 32: ...n EBZ4800 EBZ30 51 71 80 Series Fit the snap ring in the groove firmly and position the end gap of the snap ring opposite the notch If the snap ring is poorly inserted or the end gap of the snap ring...

Page 33: ...Check that there is no foreign matter inside the valve case Check the gap between the valve case and the reed valve Replace with new valve if the gap is larger than 0 2 mm 0 008 in or the valve is di...

Page 34: ...engine is overhauled replace the gaskets with new ones Model Gasket Positions Model Gasket Positions HB23 Series EBZ4800 EBZ51 Series HBZ26 Series EB6200 EB70 Series EBZ30 Series EBZ71 Series EBZ80 Se...

Page 35: ...70 Series EBZ4800 EBZ51 71 80 Series Tighten the three muffler mounting bolts to the same pressure The bracket may be damaged if the two muffler mounting bolts long on the upper side are securely tigh...

Page 36: ...Cord Assembly EBZ30 Series Secure the switch cord terminal black with the module mount bolt Tilt the terminal about 45 degrees rightward Ensure the cord is not bent nor interfering with the crankcase...

Page 37: ...ule s terminal until the cord is clear of the crankcase Switch Cord Assembly EBZ4800 EBZ51 71 80 Series Secure the switch cord terminal with the module mounting bolt Bring the terminal into contact wi...

Page 38: ...the cord on the module side is not caught between volute case and crankcase Set the lead cords and clamp them as shown in the figure at left Align the cord not to interfere with the clamp mounting scr...

Page 39: ...EB70 Series EBZ4800 EBZ51 71 Series Firmly insert the tip of the air supply nozzle into the frame air inlet pipe 4 19 Upper Spring Damper Assembly EBZ30 Series Reassembly of the upper spring damper i...

Page 40: ...not tilted Improper installation will result in rapid damage 4 21 Lower Damper Assembly EB4300 6200 EB70 Series EBZ4800 EBZ51 71 80 Series Grip the damper s metal flange with the pliers in order not t...

Page 41: ...et Assembly HB23 Series When the engine cover is installed pay attention to installing the muffler s gasket to the inside the cover to protect the fuel tank from heat Check of the Gasket Assembly HBZ2...

Page 42: ...l be reduced EB4300 6200 EB70 Series Check that the master gasket is set outside of the cylinder plate and the insulator gasket is set inside the volute case before the engine cover is installed If th...

Page 43: ...Series 6 9 9 8N m 70 100kgf cm HBZ26 Series 6 9 10 8N m 70 110kgf cm 3 Remove the spark arrester EBZ30 Series 1 Remove the engine cover Refer to 3 Special Tools 2 Remove the two mounting bolts and the...

Page 44: ...se specifications Remove any carbon slag adhering to the spark arrester screen with a brush preferably wire type or equivalent Never overheat the spark arrester with a gas torch or other flame The spa...

Page 45: ...gine trouble is observed resolve the trouble cause then replace the filter with a new one Inspection Period Operating Hours Inspection Item Daily 25 hours 50 hours 100 hours Remarks Element Pre filter...

Page 46: ...layer half wet urethane foam EBZ51 Series Loosen the knobs then remove the element Two stage dry element Pre filter Paper filter EB70 Series EBZ71 Series Loosen the knob bolts then remove the element...

Page 47: ...EBZ71 80 series pre filter dry it after rinsing and then install it Caution for element installation EB4300 6200 EBZ4800 EBZ51 Series The half wet urethane element should be moistened with 2 cycle eng...

Page 48: ...42 to 1 65 mm 0 056 to 0 065 in Snap Ring Washer Spring Washer Washer Shaft Caution in switch cord installation Thread the switch cord into the handle case slit and set its terminal 90 to 100 mm 3 54...

Page 49: ......

Page 50: ...Engine Start Loosen then tighten Engine Speed rpm Standard Engine Speed rpm Sales Region Blower Model Engine Type Throttle Valve Adjust Screw L needle Adjustment Angle H needle Adjustment Angle ID Pe...

Page 51: ...ck valve Check of throttle valve Readjust the engine rotational speed referring to 6 7 Carburetor Adjustment if the engine speed is not steady after the above mentioned adjustment and the checks are e...

Page 52: ...valve Carburetor adjustments with caps removed must be conducted by Emission Certified Servicing Dealers ONLY The dealer must supply the unit to the customer in original configuration using the manuf...

Page 53: ...prevent tampering Be sure to install only a new limiter cap The limiter cap is a very small part Pay attention not to lose it 6 5 Idling Speed Adjustment Slow and Middle Speeds All Models Adjust the...

Page 54: ...mm 0 059 0 006 in Check that no wear exists on the metering lever or diaphragm contacting areas If wear exists replace it with a new one Remove the inlet valve and check for dirt sludge rusting and or...

Page 55: ...l is not supplied though the priming pump is operated c Throttle valve normality check Check that no wear exists in the throttle valve slide Carefully slide a screw driver tip along the plunger s cont...

Page 56: ...driver 2 5mm flat tip Electronic digital tachometer Limiter cap removal tool New Limiter cap Adjustment when engine activated 1 Start the engine and alternate three times between the idling state 10 s...

Page 57: ...limiter clockwise from this position until the regulated angle is attained Refer to 6 1 Specifications Adjustment Angle for Engine Start L needle Adjustment Angle When tightening the L needle clockwi...

Page 58: ...throttle within the regulated number of revolutions Refer to 6 1 Specifications Standard Engine Speed USA HBZ2601 only After the above adjustment is completed adjust the H needle 1 Turn the H needle...

Page 59: ...ap Removal Installation Be sure to reattach the dust cover If the engine is run while the throttle valve s dust cover is removed dust or alien matter may adhere to the throttle valve s rear contoured...

Page 60: ......

Page 61: ...024L 0 005L 0 00020T 0 021L 0 00083L 0 06L 0 00024L 0 005L 0 00020T 0 021L 0 00083L 0 07L 0 0028L 0 005L 0 00020T 0 021L 0 00083L 0 07L 0 0028L Micrometer Cylinder Gauge Replacement End Gap at Cylinde...

Page 62: ...size mm M5x0 8 Air Cleaner and Carburetor Torque kgf cm N m 30 40 2 9 3 9 30 60 2 9 5 9 30 45 2 9 4 4 30 45 2 9 4 4 Thread size mm M5xL50 M5xL60 Chalk Cup and Carburetor Large Air Cleaner Torque kgf...

Page 63: ...rn out cylinder piston or piston ring Replace Fueling normal but poor compression 2 Gas leakage from cylinder and crank case gasket Apply liquid gasket and reassemble 1 Choked breather air hole Clean...

Page 64: ...djust carburetor 2 Clogging of cylinder fins with dust Clean 3 Poor fuel quality Replace with clean fuel 4 Carbon deposited in the combustion chamber Clean Overheating 5 Spark plug electrode red hot C...

Page 65: ......

Page 66: ...Printed in Japan 0901 SY 015...

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