Small Engine Specs

Specifications for small engines used on a variety of outdoor power equipment

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Honda Small Engine Cylinder Head Torques

Model Head torque ( N-m / ft-lbs )
GX640 55 / 40
GX100 -
GX120K1 24 / 17
GX160K1 24 / 17
GX200 -
GX240K1 35 / 25
GX270 35 / 25
GX340K1 35 / 25
GX390K1 35 / 25
GX22 Std - see below
GX31 Std - see below
GX610K1 34 / 25
GX620K1 34 / 25
GX670 -
GXV120 22-26 / 15.9-18.8
GXV140 24N-m
GXV160 22-26 / 15.9-18.8
GXV270 32-38 / 23.1-27.5
GXV340 32-38 / 23.1-27.5
GXV610K1 34 / 25
GXV620K1 34 / 25
GX25 Std - see below
GX35 Std - see below
GXH50 Std - see below
GXV50 Std - see below
GS190 Std - see below
GSV190 Std - see below
GC135 Std - see below
GC160 Std - see below
GC190 Std - see below
GCV135 Std - see below
GCV160 Std - see below
GCV520 Std - see below
GCV530 Std - see below
GD320 Nuts 43 / 31.1 Bolts 11 / 7.96
GD410 Nuts 43 / 31.1 Bolts 11 / 7.96
GD1100 45 / 32.5
GD1250 45 / 32.5
G150K1 2.6kW 25 / 18
G150K1 2.8kW 25 / 18
G200K1 3.7kW 25 / 18
G200K1 4.0kW 25 / 18
GV100 08 - 12 N-m
GX360 -

Honda Cylinder Head Standard Torques

Fastener Type Fastener Size ( mm )Std Torque ( N-m )Std Torque ( ft-lb )
Screw 310.7
Screw 542.9
Screw 69 6.5
Bolt and nut 5 5 3.6
Bolt and nut 6 10 7
Bolt and nut 8 21 15
Bolt and nut 10 34 25
Bolt and nut 12 54 40
Flange bolt + nut 5 5.5
Flange bolt + nut 6 12 9
Flange bolt + nut 8 26 20
Flange bolt + nut 10 39 29
SH bolt ( small head bolt ) 6 9 6.5
CT bolt ( thread - cutting bolt )55.54.0
CT bolt ( thread - cutting bolt ) 6 12 9