Husqvarna TE 310-450-510 210 I.E. Owner's Manual page 118

5) pull the lever (5) and lower further, by a limited stroke, the
pedal until the abovementioned resistance is overcome
(surpassing of T.D.C.);
TC-TXC
24
6) at this point, release the lever (5) and the pedal (4);
TC-TXC
4
TC-TXC
7) in the case of COLD STARTING, completely rotate the throttle
(6) twice (in the case of warm starting DO NOT carry out
this operation);