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Biogas is an alternative fuel in the form of gases derived from dirt or waste. In general, biogas is used as a fuel source for cooking stoves for daily needs. The stove has a special design so it has not been reached by the community, especially in the countryside. One alternative to solve this problem was to modify the spuyer of stove of conventional LPG to be compatible with biogas fuel. The purpose of this paper was to determine the ability of conventional LPG stoves in terms of flame length to the diameter of the spuyer hole on the stove. The variation of the hole was 2; 2.5; 3; and 3.5 mm in diameter. The conventional LPG stove used the Rinai RI-511E type with medium of input control. While the biogas pressure from the digester to the stove was 0.106 MPa. The results showed an increase in flame length from 30.79 mm to 166.95 mm if the spuyer diameter was enlarged from 2 mm to 3.5 mm. So that the increase of flame length could reach 442.22%.