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One of energy conversion machine is four-stroke engine, that divided into two gasoline engine type and Diesel engine type. In a gasoline engine, the ignition system needs a spark plug. In this research, the researcher used a regular spark plug and platinum spark plug. The regular spark plug is a spark plug that has a heat range which is recommended by factories, and its tip is made from nickel. A platinum spark plug is a spark plug that has a platinum tip at the center electrode. Technically, platinum spark plug specification is over-engineered from a regular spark plug. This research has a purpose to gain data and analyzing the impact of platinum spark plug gap on fuel consumption and exhaust emission at Suzuki Smash 110cc motorcycle. A spark plug gap is needed in order to spark plug can fire up to combust gas mixture in the cylinder. This research method used one-shot experiment design. Variables in this research are spark plug electrode gap, RON 90 and RON 88 gasoline, engine RPM variation, and exhaust gas emission. Data analysis used descriptive analysis that presenting graphics to do the interpretation. The result of this research are: (1) The platinum spark plug and RON 90 fuel can reduce fuel consumption to 5% average, and the optimum gap, around 0,7 – 0,9 mm; (2) Platinum spark plug electrode gap around 0,4 – 1mm resulting less emission compared to regular spark plug C7HSA at all gap variations. Using platinum spark plug and RON 90 fuel can reduce emission by 7% on average.

Platinum Spark Plug Gap Adjustment to Fuel Consumption and CO Emission at 110cc Engine