Robin NB221, NB251, NBF252 are brush cutters and string trimmers designed for trimming grass, weeds, and low growth, non-wood ground covers. They are powered by a 2-cycle engine with a displacement of 21.7 cc (NB221, NB221A) or 24.5 cc (NB251, NB251A, NBF251) and a power rating of 1.0 ps (NB221, NB221A) or 1.3 ps (NB251, NB251A, NBF251). The cutters have a revolution speed of 4,000 - 6,000 rpm. They are equipped with an automatic centrifugal clutch and a recoil starter. The fuel tank has a capacity of 0.5 liters and the recommended fuel is a mixture of gasoline and