Need throttle to start up bike

[7653]

Actions:
-Turned the idle knob .75 turn clockwise. After the idle speed knob was adjusted when there is no throttle at all the bike moves about 5-6 MPH. (I don't have a tachometer so I am describing the RPM of my bike through how fast/MPH it moves without any throttle at all instead.)
-Put one-fifth of a can of Seafoam into the gas tank and rode bike for about 40 miles total since then

Results:
-Bike does not stall during stops anymore. Bike idle is louder. -- probably due to increased idle speed
-Bike seems to run a little bit smoother now -- due to Seafoam or placebo effect?

Lack of Results:
-In order to fire up the bike I still need to put it on full choke and throttle before I even press the starter button
-When it is on full choke and throttle and I press the starter button I still sometimes have to hold the starter button for the length of a several "tuh tuh tuhs" and when I get off the starter button the bike has to quietly make a few "jug jug jug jug" sounds while my bike is on full throttle & choke before it will sound off with a loud RRRRREEEEVVVV.

Any ideas on what else can be done to fix the latter? What is the problem? Or should I just bring the bike to a mechanic?