TWO-CYCLE ENGINE AND SMALL PLANING BOAT FURNISHED WITH IT

摘要

PROBLEM TO BE SOLVED: To properly hold a pre-load ratio of a crankcase and to maintain a balancer in a proper lubricating state. SOLUTION: Balancers 18A, 18B to rotate interlocked with a crankshaft 4 and an oil pump 39 to supply lubricating oil to these balancers are provided on a two-cycle engine 3. Additionally, a balancer chamber 40b to store the balancer 18B and a crankcase 42 are communicated to each other through a labyrinth seal 43b provided on an outer periphery of the crankshaft 4.