Portable sawmill

A sawmill comprising:

• a four-stroke internal combustion engine including:
• an output shaft for driving a sawblade, the output shaft having a longitudinal axis;
• and a crankcase having an opening for assembly of at least a crankshaft and piston, and
• a closure covering the opening;
• a support framework, the engine being selectively pivotable relative to a portion of the support framework between a first operative position with the longitudinal axis of the output shaft extending at a sideways angle, and a second operative position with the longitudinal axis of the output shaft extending at a downwards angle transversely to the sideways angle, the engine having fuel injection configured to facilitate operation in both the first and second operative positions;
• and
• a lubrication system configured to circulate an amount of lubricant corresponding to a predetermined capacity for the engine, wherein the crankcase incorporates a wet sump, wherein the wet sump is defined by a first wet sump region open to the crankcase for collection of lubricant in the first operative position of the engine, the lubricant collecting up to a first liquid level in the first wet sump region when said amount of lubricant is supplied to the engine, with the depth of the crankcase being such that the crankshaft is clear of the first lubricant level,
• the wet sump being further defined by a second wet sump region in the closure for collection of lubricant in the second operative position of the engine, the lubricant collecting up to a second liquid level in the second wet sump region when said amount of lubricant is supplied to the engine, the depth of the closure being greater than the depth of the second lubricant level,
• wherein the lubrication system includes an oil inlet disposed at an intersection of the first wet sump region and the second wet sump region.