Engine

An engine comprising:

• a crankcase body including a bottom plate including a first crankshaft insertion hole and a tubular portion including a case opening portion on an opposite side to the bottom plate;
• a crankcase cover including a second crankshaft insertion hole and covering the case opening portion of the crankcase body;
• a crankshaft which is inserted into the first crankshaft insertion hole and the second crankshaft insertion hole;
• a cylinder base portion located inside the crankcase body;
• a cylinder block located outside the crankcase body;
• and
• a camshaft disposed inside the crankcase body and between the bottom plate and the cylinder base portion, wherein
• the crankcase body has the bottom plate detachably attached to the tubular portion,
• a shaft portion of the camshaft is positioned between the cylinder base portion and the bottom plate, and the shaft portion of the camshaft is positioned to be pressed from above by the cylinder base portion when viewed from the upper side of the case opening portion, and
• the bottom plate is configured to axially support the shaft portion of the camshaft.