A portable sawmill

Four-stroke motors are typically the motor of choice for a portable sawmill. However， engines which are available for agricultural and other low cost applications utilise a carburettor and an engine lubrication system with a wet sump. Both of these features require the four-stroke engine to be maintained at a substantially level orientation. Due to these constraints， it is usual for a portable sawmill to use a four-stroke engine that has a power transfer including a centrifugal clutch and a belt drive which drives the pulley on a 90?? gearbox. This adds cost and weight of the portable sawmill. The disclosed sawmill includes a four-stroke internal combustion engine (30) having an output shaft (36) for driving a sawblade. The engine is mounted on the sawmill to rotate the blade between a horizontal operative position and a vertical operative position. The engine has fuel injection and an oil pick up (40) for the lubrication system disposed to pick up oil from both wet sumps. These two features allow operation of the engine in both positions， eliminating the need for a power transfer and reducing the weight， complexity， and the number of components.