It has been known that the combustion chamber deposit (CCD) makes various problems on engine property. Especially, the CCD formation in the two-stroke cycle engines is more than four-stroke. In this report, we have studied about the relation between the CCD distribution and the temperature profile on the piston head in a small two-stroke cycle engine for getting the understanding CCD formation mechanism in this engine types. The temperature was measured using many fusible plugs (FP) which has different fusing point embedded on a piston crown surface.