AIR CLEANER FOR TWO-STROKE INTERNAL COMBUSTION ENGINE AND METHOD OF ADJUSTING LENGTH OF AIR-FUEL MIXTURE PASSAGE USING THE AIR CLEANER

摘要

PROBLEM TO BE SOLVED: To change characteristics of a two-stroke internal combustion engine while reducing harmful emission in exhaust gas exhausted from the engine.

SOLUTION: In the two-stroke internal combustion engine, an air cleaner 302 includes an air cleaner base 308 capable of being attached and detached to and from a carburetor 306. The air cleaner base 308 has an air-fuel mixture opening 316 communicating with an air-fuel mixture passage 314 of the carburetor 306 and a fresh air opening 318 communicating with a fresh air passage 312 of the carburetor 306. The air cleaner base 308 also has an L-shaped air guide member 320 communicating with the air-fuel mixture opening 316. The air guide member 320 is integrally formed with the air cleaner base 308 so as not to be detached therefrom. A plurality of types of air cleaner bases 308 is prepared having respective extended air passages for air-fuel mixture 324 with different lengths each of which is defined by the air guide member 320. A user selects one of the air cleaner bases 308 adapted for engine characteristics desired by the user. The selected air cleaner base 308 is then built into the engine.

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