Evaluation of Lubricants for Japanese Small Air-Cooled Two-Cycle Engines

Problems associated with use of oils for small air-cooled two-cycle engines are mainly piston deposits, ring sticking, spark plug fouling, combustion-chamber deposits, piston seizure, exhaust system blocking and visible smoke.

This paper describes some test methods for evaluation of lubricants for Japanese small air-cooled two-cycle engines.

Results obtained from some of these test are also expressed.

The effect of base oil composition and additive type on lubricant performance is also described.