Honda GC135, GC160, GC190, GS190, GX22 Engine Service Specifications

Specifications

Engine

Service

GX22-25-31-35

OHV/OHC, Mini 4 stroke

GC series engines

Premium residential,

OHC, Horizontal crankshaft

GCV series engines

Premium residential,

OHC, Vertical crankshaft

GS series engines

Pro-sumer, OHC,

OHC, Horizontal crankshaft

GSV series engines

Pro-sumer, OHC,

OHC, Vertical crankshaft

GX Series engines

Commercial grade,

OHV, Horizontal crankshaft

GXV Series engines

Commercial grade,

OHV, Vertical crankshaft

Specifications subject to change

without notice.

OHV Horizontal engines
Pages 3 to 17
OHV Vertical engines
Pages 18 to 26
Liquid cooled engines
Page 27
Side Valve Horizontal engines
Pages 27 to 37
Side Valve Vertical engines
Pages 38 to 45

Oil used should be 10W-30

Unless otherwise specified
For propane applications

SAE 30 Wt oil can be used

© 2009 American Honda Motor Co., Inc.—All Rights Reserved

GC135, GC160, GC190

Oil Capacity

0.61 qt.
Transmission Oil
NA
Spark Plug
NGK BPR6ES
Spark Plug Gap

0.7 ~ 0.8 mm

0.028 ~ 0.031 in.
Float Height

9.2 mm (0.36 in.)
Engine RPM
Idle: 1,400 ± 150 rpm

Maximum: 3,850 ± 150 rpm

Compression

0.49 kPa (71 psi) @ 600 rpm
Valve Clearance
IN: 0.15 ± 0.04 mm EX: 0.20 ± 0.04 mm

GS190

Oil Capacity

0.58 qt.
Transmission Oil
NA
Spark Plug
NGK BPR6ES
Spark Plug Gap

0.7 ~ 0.8 mm

0.028 ~ 0.031 in.

Float Height

9.2 mm (0.36 in.)
Engine RPM
Idle: 1,400 ± 150 rpm

Maximum: 3,850 ± 150 rpm

Compression

0.49 kPa (71 psi) @ 600 rpm
Valve Clearance
IN: 0.15 ± 0.04 mm EX: 0.20 ± 0.04 mm

© 2009 American Honda Motor Co., Inc.—All Rights Reserved

GX22, GX31

Oil Capacity

0.11 qt.
Transmission Oil
NA
Spark Plug
NGK CR5HSB DENSO U16FSR-UB
Spark Plug Gap

0.6 ~ 0.7 mm

0.024 ~ 0.028 in.

Float Height
NA
Engine RPM
Idle: 3,100 ± 200 rpm

Maximum: 8,000 rpm

Compression
807-1096 kPa (117 ~ 159 psi)

@ 2,000 rpm

Valve Clearance
IN: 0.12 ± 0.02 mm EX: 0.15 ± 0.02 mm

GX25

Oil Capacity

0.08 qt.
Transmission Oil
NA
Spark Plug
NGK CMR5H
Spark Plug Gap

0.6 ~ 0.7 mm

0.024 ~ 0.028 in.
Float Height
NA
Engine RPM
Idle: 3,100 ± 200 rpm

Maximum: 8,000 ± 200 rpm

Compression
131 ~ 159 psi
Valve Clearance
IN: 0.08 ± 0.02 mm EX: 0.11 ±0 .02 mm

© 2009 American Honda Motor Co., Inc.—All Rights Reserved

GX35

Oil Capacity

0.11 qt.
Transmission Oil
NA
Spark Plug
NGK CMR5H
Spark Plug Gap

0.6 ~ 0.7 mm

0.024 ~ 0.028 in.

Float Height
NA
Engine RPM
Idle: 3,100 ± 200 rpm

Maximum: 10,000 rpm

Compression
138 ± 22
Valve Clearance
IN: 0.08 ± 0.02 mm EX: 0.11 ±0 .02 mm

GXH50

Oil Capacity

0.26 qt.

Transmission Oil
NA
Spark Plug
NGK CR5HSB DENSO U16FSR-UB
Spark Plug Gap

0.6 ~ 0.7 mm

0.024 ~ 0.028 in.

Float Height
12 mm (0.47 in.)
Engine RPM
Idle: 2,500 ± 200 rpm

Maximum No Load:
7,800 ± 150 rpm

Compression
422 kPa (61.2 psi) @ 1,000 rpm
Valve Clearance
IN: 0.08 ± 0.02 mm EX: 0.11 ±0 .02 mm

© 2009 American Honda Motor Co., Inc.—All Rights Reserved

GX100

Oil Capacity

0.42 qt.
Transmission Oil
NA
Spark Plug

NGK CR5HSB DENSO U16FSR-UB

Spark Plug Gap

0.6 ~ 0.7 mm

0.024 ~ 0.028 in.

Float Height
12 mm (0.5 in.)
Engine RPM
Idle: 1,550 ± 150 rpm
Maximum: 4,000 ± 200 rpm
Compression

0.49 kPa (71 psi) @ 700 rpm
Valve Clearance
IN: 0.15 ± 0.04 EX: 0.20 ± 0.04

GX110

Oil Capacity

0.63 qt.
Transmission Oil
1/2 reduction: 0.53 qt.

1/6 reduction: 0.16 qt.

Spark Plug
NGK BP6ES NGK BPR6ES
Spark Plug Gap

0.7 ~ 0.8 mm

0.028 ~ 0.031 in.

Float Height

13.7± 1.5 mm

0.54 ± 0.06 in.
Float Height

13.7± 1.5 mm
(0.54 ± 0.06 in.)

Engine RPM
Idle: 1,550 ± 150 rpm

Maximum: 4,000 ± 200 rpm

Compression
Decompressor engaged:

711 ± 123 kPa (103 ± 18 psi)
@ 600 rpm
Decompressor disengaged:
979 ± 193 kPa (142 ± 28 psi)
@ 600 rpm

Valve Clearance
IN: 0.15 ± 0.02 mm EX: 0.20 ± 0.02 mm

© 2009 American Honda Motor Co., Inc.—All Rights Reserved

GX120

Oil Capacity

0.63 qt.
Transmission Oil
1/2 reduction (centrifugal clutch type): 0.53 qt.

1/2 reduction (L t ype): Lubricated from engine
crankcase.
1/6 reduction: 0.16 qt.

Spark Plug
NGK BP6ES NGK BPR6ES
Spark Plug Gap

0.7 ~ 0.8 mm

0.028 ~ 0.031 in.

Float Height

13.7 mm (0.54 in.)
Engine RPM
Idle: 1,400 ± 150 rpm

Maximum: 3,850 ± 150 rpm
Maximum for DS type: 3,750 ± 150 rpm

Compression
Decompressor engaged: 711 ± 123 kPa

(103± 18 psi) @ 600 rpm
Decompressor disengaged: 979 ± 193 kPa
(142 ± 28 psi) @ 600 rpm

Valve Clearance
IN: 0.15 ± 0.02 mm EX: 0.20 ± 0.02 mm

GX140

Oil Capacity

0.63 qt.
Transmission Oil
1/2 reduction: 0.53 qt. 1/6 reduction: 0.16 qt.
Spark Plug
NGK BP6ES NGK BPR6ES
Spark Plug Gap

0.7 ~ 0.8 mm

0.028 ~ 0.031 in.

Float Height

13.7 ± 1.5 mm (0.54 ± 0.06 in.)
Engine RPM
Idle: 1,400 + 200 - 150 rpm

Maximum: 3,900 ± 150 rpm

Compression
Decompressor engaged: 711 ± 123 kPa

(103 ± 18 psi) @ 600 rpm
Decompressor disengaged: 979 ± 193 kPa
(142 ± 28 psi) @ 600 rpm

Valve Clearance
IN: 0.15 ± 0.02 mm EX: 0.20 ± 0.02 mm

© 2009 American Honda Motor Co., Inc.—All Rights Reserved

GX160

Oil Capacity

0.63 qt.
Transmission Oil
1/2 reduction (centrifugal clutch type): 0.53 qt.

1/2 reduction (L t ype): Lubricated from engine
crankcase.
1/6 reduction: 0.16 qt.

Spark Plug
NGK BP6ES NGK BPR6ES
Spark Plug Gap

0.7 ~ 0.8 mm

0.028 ~ 0.031 in.

Float Height

13.7 mm (0.54 in.)
Engine RPM
Idle: 1,400 ± 150 rpm Maximum: 3,850 ± 150 rpm

Maximum for (DS type): 3,750 ± 150 rpm

Compression
Decompressor engaged: 711 ± 123 kPa

(85 ~ 121 psi) @ 600 rpm
Decompressor disengaged: 979 ± 193 kPa
114 ~ 170 psi) @ 600 rpm

Valve Clearance
IN: 0.15 ± 0.02 mm EX: 0.20 ± 0.02 mm

GX200

Oil Capacity

0.63 qt.
Transmission Oil
1/2 reduction (centrifugal clutch type): 0.53 qt.

1/2 reduction (L t ype): Lubricated from engine
crankcase.
1/6 reduction: 0.16 qt.

Spark Plug
NGK BPR6ES W20EPR-U
Spark Plug Gap

0.7 ~ 0.8 mm

0.028 ~ 0.031 in.

Float Height

13.7 mm (0.54 in.)
Engine RPM
Idle: 1,400 + 200 -150 rpm

Maximum:3,850 ± 150 rpm

Compression

51.2 psi
Valve Clearance
IN: 0.15 ± 0.02 mm EX: 0.20 ± 0.02 mm

© 2009 American Honda Motor Co., Inc.—All Rights Reserved

GX240

Oil Capacity

1.16 qt.
Transmission Oil
1/2 reduction (centrifugal clutch type): 0.32 qt.

1/2 reduction (L t ype): Lubricated from
engine crankcase
1/6 reduction: Lubricated
from engine crankcase

Spark Plug
NGK BP6ES NGK BPR6ES
Spark Plug Gap

0.7 ~ 0.8 mm

0.028 ~ 0.031 in.

Float Height

13.2 ± 1.3 mm (0.52 ± 0.05 in.)
Engine RPM
Idle: 1,400 ± 150 rpm

Maximum: 3,850 ± 150 rpm

Compression
Decompressor engaged: 711 ± 123 kPa

(85 ~ 121 psi) @ 600 rpm
Decompressor disengaged: 979 ± 193 kPa
(114 ~ 170 psi) @ 600 rpm

Valve Clearance
IN: 0.15 ± 0.02 mm EX: 0.20 ± 0.02 mm

© 2009 American Honda Motor Co., Inc.—All Rights Reserved

GX270

Oil Capacity

1.16 qt.
Transmission Oil
1/2 reduction (centrifugal clutchtype): 0.32 qt.

1/2 reduction (L t ype): Lubricated from
engine crankcase
1/6 reduction: Lubr icated from engine
crankcase

Spark Plug
NGK BP6ES NGK BPR6ES
Spark Plug Gap

0.7 ~ 0.8 mm

0.028 ~ 0.031 in.

Float Height

13.2 ± 1.3 mm (0.52 ± 0.05 in.)
Engine RPM
Idle: 1,400 ± 150 rpm

Maximum: 3,850 ± 150 rpm

Compression
Decompressor engaged: 711 ± 123 kPa

(85 ~ 121 psi) @ 600 rpm
Decompressor disengaged: 979 ± 193 kPa
(114 ~ 170 psi) @ 600 rpm

Valve Clearance
IN: 0.15 ± 0.02 mm EX: 0.20 ± 0.02 mm

GX340

Oil Capacity

1.16 qt.
Transmission Oil
1/2 reduction: Lubricated from engine crankcase

1/6 reduction: Lubr icated from engine crankcase

Spark Plug
NGK BP6ES-11 NGK BPR6ES-11
Spark Plug Gap

1.0 ~ 1.1 mm (0.039 ~ 0.043 in.)
Float Height

13.2 ± 1.3 mm (0.52 ± 0.05 in.)
Engine RPM
Idle: 1,400 ± 150 rpm

Maximum: 3,850 ± 150 rpm

Compression
Decompressor engaged: 711 ± 123 kPa

(85 ~ 121 psi) @ 600 rpm
Decompressor disengaged: 979 ± 193 kPa
(114 ~ 170 psi) @ 600 rpm

Valve Clearance
IN: 0.15 ± 0.02 mm EX: 0.20 ± 0.02 mm

© 2009 American Honda Motor Co., Inc.—All Rights Reserved

GX340K1

Oil Capacity

1.16 qt.
Transmission Oil
1/2 reduction: Lubricated from engine crankcase

1/6 reduction: Lubr icated from engine crankcase

Spark Plug
NGK BP6ES NGK BPR6ES
Spark Plug Gap

0.7~0.8 mm (0.028~0.031 in.)
Float Height

13.2 ± 1.3 mm (0.52 ± 0.05 in.)
Engine RPM
Idle: 1,400 ± 150 rpm

Maximum: 3,850 ± 150 rpm

Compression
Decompressor engaged: 711 ± 123 kPa

(85 ~ 121 psi) @ 600 rpm
Decompressor disengaged: 979 ± 193 kPa
(114 ~ 170 psi) @ 600 rpm

Valve Clearance
IN: 0.15 ± 0.02 mm EX: 0.20 ± 0.02 mm

GX390K1

Oil Capacity

1.16 qt.
Transmission Oil
1/2 reduction: Lubricated from engine crankcase

1/6 reduction: Lubr icated from engine crankcase

Spark Plug
NGK BP6ES NGK BPR6ES
Spark Plug Gap

0.7~0.8 mm (0.028~0.031 in.)
Float Height

13.2 ± 1.3 mm (0.52 ± 0.05 in.)
Engine RPM
Idle: 1,400 ± 150 rpm

Maximum: 3,850 ± 150 rpm

Compression
Decompressor engaged: 711 ± 123 kPa

(85 ~ 121 psi) @ 600 rpm
Decompressor disengaged: 979 ± 193 kPa
(114 ~ 170 psi) @ 600 rpm

Valve Clearance
IN: 0.15 ± 0.02 mm EX: 0.20 ± 0.02 mm

© 2009 American Honda Motor Co., Inc.—All Rights Reserved

iGX440

Oil Capacity

1.16 qt.
Transmission Oil
NA
Spark Plug
NGK BKR7E-E DENSO K22PR-UR
Spark Plug Gap

0.7~0.8 mm (0.028~0.031 in.)
Float Height

13.2 ± 1.3 mm (0.52 ± 0.05 in.)
Engine RPM
3,600 rpm* *ECM base program
Compression
57 ~ 100 psi
Valve Clearance
IN: 0.12 ± 0.02 mm EX: 0.15 ± 0.02 mm

GX610, GX620

Oil Capacity
Without filter change: 1.27 qt.

With filter change: 1.59 qt.

Transmission Oil
NA
Spark Plug
NGK BP6ES NGK BPR6ES
Spark Plug Gap

0.7~0.8 mm (0.028~0.031 in.)
Float Height

14.0 mm (0.55 in.)
Engine RPM
Idle: 1,400 ± 150 rpm

Maximum: 3,850 ± 150 rpm

Compression
586 ~ 786 kPa (85 ~ 114 psi)

@ 500 rpm

Valve Clearance
IN: 0.15 ± 0.02 mm EX: 0.20 ± 0.02 mm

© 2009 American Honda Motor Co., Inc.—All Rights Reserved

GX610K1
GX620K1

Oil Capacity
Without filter change: 1.16 qt.

With filter change: 1.48 qt.

Transmission Oil
NA
Spark Plug
NGK ZGR5A
Spark Plug Gap

0.7~0.8 mm (0.028~0.031 in.)

Dry Fuel 0.3~0.4 mm (0.012~0.016 in.)

Float Height

14.0 mm (0.55 in.)
Engine RPM
Idle: 1,400 ± 150 rpm

Maximum: 3,850 ± 150 rpm

Compression
586 ~ 786 kPa (85 ~ 114 psi)

@ 500 rpm

Valve Clearance
IN: 0.15 ± 0.02 mm EX: 0.20 ± 0.02 mm

GX630

Without filter change: 1.59 qt.

With filter change: 1.80 qt.

Transmission Oil
NA
Spark Plug
NGK ZFR5F, FR2A
Spark Plug Gap

0.7~0.8 mm (0.028~0.031 in.)
Float Height

15.5 mm ( 0.61 in.)
Engine RPM
Idle: 1,400 ± 150 rpm

Maximum: 3,850 ± 150 rpm

Compression
499 ~ 7.00 kPa (73 ~ 102 psi)

@ 500 rpm

Valve Clearance
IN: 0.08 ± 0.02 mm EX: 0.10 ± 0.02 mm

Oil Capacity

© 2009 American Honda Motor Co., Inc.—All Rights Reserved

GX660

Oil Capacity

Without filter change: 1.59 qt.

With filter change: 1.80 qt.

Transmission Oil
NA
Spark Plug
NGK ZFR5F, FR2A
Spark Plug Gap

0.7~0.8 mm (0.028~0.031 in.)
Float Height

15.5 mm ( 0.61 in.)
Engine RPM
Idle: 1,400 ± 150 rpm

Maximum: 3,850 ± 150 rpm

Compression
499 ~ 7.00 kPa (73 ~ 102 psi)

@ 500 rpm

Valve Clearance
IN: 0.08 ± 0.02 mm EX: 0.10 ± 0.02 mm

GX670

Oil Capacity
Without filter change: 1.69 qt.

With filter change: 2.01 qt.

Transmission Oil
NA
Spark Plug
NGK ZGR5A
Spark Plug Gap

0.7~0.8 mm (0.028~0.031 in.)

Dry Fuel 0.3~0.4 mm (0.012~0.016 in.)

Float Height

15.0 mm (0.59 in.)
Engine RPM
Idle: 1,400 ± 150 rpm

Maximum: 3,850 ± 150 rpm

Compression
586 ~ 786 kPa (85 ~ 114 psi)

@ 500 rpm

Valve Clearance
IN: 0.15 ± 0.02 mm EX: 0.20 ± 0.02 mm

© 2009 American Honda Motor Co., Inc.—All Rights Reserved