Micro Gasparini's CO2 engines are very suitable for gearing a micro models with a weight from 1 - 15 grams. The first micro motor G2 was built in 1983. In 1985 was bulit an engine G1 content 1 cmm . In 2002 was satisfactorily finished a series production of engine G2,6. Complete gear with this engine weighs around 1g. This GRAMMOTOR is really good CO2 micro motor for general use. Experiences with engines G1S and G2,6 were applied to small engines G3, G5 and G10.