Small Engine Specs

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

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Honda Small Engine Spark Plug Gaps

Model Series Spark Plug Gap
GX640 1.0-1.1mm ( 0.039-0.043in. )
GX100 0.6-0.7mm ( 0.024-0.028in )
GX120 0.7-0.8mm ( 0.028-0.031in )
GX160 0.7-0.8mm ( 0.028-0.031in )
GX200 0.7-0.8mm ( 0.028-0.031in )
GX240K1 0.7-0.8mm ( 0.028-0.031in )
GX270 0.7-0.8mm ( 0.028-0.031in )
GX340K1 0.7-0.8mm ( 0.028-0.031in )
GX390K1 0.7-0.8mm ( 0.028-0.031in )
GX22 0.6-0.7mm ( 0.024-0.028in )
GX31 0.6-0.7mm ( 0.024-0.028in )
GX610 0.7-0.8mm ( 0.028-0.031in )
GX620 0.7-0.8mm ( 0.028-0.031in )
GX670 0.7-0.8mm ( 0.028-0.031in )
GXV120 0.7-0.8mm ( 0.028-0.031in )
GXV140 0.7-0.8
GXV160 0.7-0.8mm ( 0.028-0.031in )
GXV270 0.7-0.8mm ( 0.028-0.031in )
GXV340 0.7-0.8mm ( 0.028-0.031in )
GXV610K1 0.7-0.8mm ( 0.028-0.031in )
GXV620K1 0.7-0.8mm ( 0.028-0.031in )
GX25 0.6-0.7mm ( 0.024-0.028in )
GX35 0.6-0.7mm ( 0.024-0.028in )
GXH50 0.6-0.7mm ( 0.024-0.028in )
GXV50 0.6-0.7mm ( 0.024-0.028in )
GS190 0.7-0.8mm ( 0.028-0.031in )
GSV190 0.7-0.8mm ( 0.028-0.031in )
GC135 0.7-0.8mm ( 0.028-0.031in )
GC160 0.7-0.8mm ( 0.028-0.031in )
GC190 0.7-0.8mm ( 0.028-0.031in )
GCV135 0.7-0.8mm ( 0.028-0.031in )
GCV160 0.7-0.8mm ( 0.028-0.031in )
GCV520 0.7-0.8mm ( 0.028-0.031in )
GCV530 0.7-0.8mm ( 0.028-0.031in )
GD320 Diesel
GD410 Diesel
GD1100 Diesel
GD1250 Diesel
G150K1 2.6kW 0.6-0.7mm ( 0.02-0.03in )
G150K1 2.8kW 0.6-0.7mm ( 0.02-0.03in )
G200K1 3.7kW 0.6-0.7mm ( 0.02-0.03in )
G200K1 4.0kW 0.6-0.7mm ( 0.02-0.03in )
GV100 0.6-0.7mm ( 0.024-0.028in )
GX360 0.6-0.7mm ( 0.024-0.028in )