Originally posted by sup
how hot should sirio engines be to have an optimal/safe temp? i have a sirio .12 abc 3port non turbo. i think i have a rich setting coz i my temp does not go above 100 degrees C (average of 100 degrees centigrade, about 210 degrees farenheit).. thanks in advance guys! 
All engines demand a different temperature to perform at full potential. Better to do carb adjustments by 'ear' and eye... seeing that in full acceleration, your car leaves by the exhaust a small trail of smoke will show you that's is healty, lean it accordingly this and don't focuse only in temperature readings.
Two engines of the same brand and model should not perform equally at the same temperature. Found one Sirio that refused to perform well under 120ºC temps (Sirio mills love to go slightly hotter than Nova ones) and other loved to go at 135ºC.