Overhead Valve Horizontal Shaft
| GX390 | ||||||||
| Variation | QA2* | QXC9 | QAE2 | QNE2(4) | VA2 | VXE2 | HA2 | LX2(3) |
| Type | K1 | K1 | K1 | K1 | K1 | K1 | K1 | K1 |
| Oil Alert | x | x | x | x | x | x | x | x |
| Horizontal Shaft | x | x | x | x | x | x | x | x |
| Crankshaft P.T.O. | 3 31/64 x 1 dia. tapped 3/8 24 UNF | 3 31/64 x 1 dia. tapped 3/8 24 UNF | 3 31/64 x 1 dia. tapped 3/8 24 UNF | 3 31/64 x 1 dia. tapped 3/8 24 UNF | 4 11/64 x 22.2 mm taper 2 1/4" per ft. | 4 11/64 x 22.2 mm taper 2 1/4" per ft. | 3 15/16 X 1 dia. | 2 23/64 x 25 mm tapped M8 x 1.25 |
| 6 to 1 Reduction | . | . | . | . | . | . | x | . |
| 2 to 1 Reduction | . | . | . | . | . | . | . | x |
| Top Speed Governed Speed - No Load | 3900 | 3900 | 3900 | 3900 | 3900 | 3900 | 3900 | 3900 |
| Recoil Starter | x | x | x | x | x | x | x | x |
| 12V Starter | . | . | x | x | . | x | . | . |
| Transistor Ignition | x | x | x | x | x | x | x | x |
| Air Cleaner | DE | CY | DE | DE | DE | DE | DE | DE |
| Fuel Tank (Qt.) | 6.9 | 6.9 | 6.9 | 6.9 | 6.9 | 6.9 | 6.9 | 6.9 |
| Net Weight | 69 | 69 | 75 | 75 | 69 | 75 | 78 | 77 |
| * These models can also be ordered with inner-vent carburetors. | ||||||||