Small Engine
Honda GX630
4-Stroke
The Honda GX630 is a 688cc V-twin 4-stroke overhead-valve engine built for commercial and industrial equipment that demands high torque — large generators, riding mowers, welders, and heavy-duty power equipment. Unlike Honda's single-cylinder GX engines, the GX630 uses a V-twin configuration for smoother power delivery and reduced vibration under load. It uses a Keihin carburetor <!-- verify: powerequipment.honda.com --> and accepts NGK BPR6ES or Champion RC12YC spark plugs. Oil change intervals every 100 hours and air filter maintenance every 50 hours are standard. Valve clearance should be inspected every 300 hours.
Honda GX630 quick specs
- Equipment
- Small Engine · 4-Stroke
- Covered Parts
- Spark Plug, Air Filter, Oil Filter, Fuel Filter, Carburetor
- OEM References
- 5
- Model Family
- GX630, GX660, GX690
ℹ See also: GX660, GX690 — parts are often interchangeable within this family.
Spark Plug
OEM98079-5587G(0.7-0.8mm gap)NGK ZFR5F equivalent; V-twin engine requires one plug per cylinder (2 total)
| Brand | Part # | |
|---|---|---|
| NGK | ZFR5F | Buy on Amazon → |
Air Filter
OEM17210-Z6L-010Also fits GX660, GX690, GX630R, GX630RH
| Brand | Part # | |
|---|---|---|
| Stens | 100-005 | Buy on Amazon → |
Oil Filter
OEM15400-PLM-A02Also fits GX610, GX620, GX660, GX670, GX690
| Brand | Part # | |
|---|---|---|
| Stens | 120-722 | Buy on Amazon → |
Fuel Filter
OEM16910-Z6L-003Inline fuel filter; also fits GX660, GX690, GXV630
| Brand | Part # | |
|---|---|---|
| Stens | 120-008 | Buy on Amazon → |
Carburetor
OEM16100-Z9E-033Also supersedes 16100-Z9E-023 and 16100-Z9E-003; fits GX630, GX660, GX690 V-twin engines
| Brand | Part # | |
|---|---|---|
| Stens | 520-342 | Buy on Amazon → |