Grainger has gasoline engines. They are suitable for outdoor use only and not designed for recreational vehicle use. Aluminum bore and float carburetor provide easy starting. Standard Series has cast-iron cylinder sleeve. Select models have air, fuel, and oil filters which are larger than those of most engines, hardened crankshaft journals, and a self-relieving choke carburetor. Gasoline engines feature internal gear box with 6:1 reduction.