Quick starting steps (mostly only on cold engine).
1. Squeeze primer bulb until firm as discussed above
2. Place control lever in fast idle position
3. Press in key and keep pressing while turning to start motor. Hold up to no more than 10 secs.
4. If motor starts,promptly release key from being pressed.
5. If motor did not start and did not "cough" or "sneeze", try step 3 again. Note if motor "sneezes" or "coughs" normally it will disengage the starter pinion gear from the flywheel ring. Let go and reset of the key and do step 6. Usually, it only takes no more than two times of "choking" to start the motor doing more or longer can flood the carbs.
6. If motor "coughs" or "sneeze", try starting again but without the choke or enricher (i.e., DO NOT PRESS IN THE KEY)
Let us know how it goes.