Overhead Valve Horizontal Shaft
| GX120 | ||||||
| Variation | QA2* | QX2 | QXC9 | QXS2(1) | HX2* | TX2 |
| Type | K1 | K1 | K1 | K1 | K1 | K1 |
| Oil Alert | 2 7/16 x 3/4 dia. tapped 5/16 24 UNF | 2 7/16 x 3/4 dia. tapped 5/16 24 UNF | 2 7/16 x 3/4 dia. tapped 5/16 24 UNF | 2 7/16 x 3/4 dia. tapped 5/16 24 UNF | 2 3/64 x 3/4 dia. | 2 7/16 x 5/8 threaded |
| 6 to 1 Reduction | . | . | . | . | x | . |
| Top Speed Governed Speed - No Load | 3900 | 3900 | 3900 | 3900 | 3900 | 3900 |
| Recoil Starter | x | x | x | x | x | x |
| Transistor Ignition | x | x | x | x | x | x |
| Air Cleaner | OB | DE | CY | DE | DE | DE |
| Fuel Tank (Qt.) | 2.64 | 2.64 | 2.64 | 2.64 | 2.64 | 2.64 |
| Net Weight | 29 | 29 | 30 | 29 | 35 | 29 |
| * These models can also be ordered with inner-vent carburetors. | ||||||