Small Engines (Lawn Mowers, etc.): Full choke to run, air mixture, float bowl

Question
Thanks John,
I did get it to idle and run with out soaking it and using the choke. I do have a dead spot in the throtle control when I go from idle on the way to full it will die. After it dies I have to hit the prime once to restart even after it is hot. When you bypass the governer do you push it in?  Also when you adjust the idle screws are you turning them in or out?
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The text above is a follow-up to ...

-----Question-----
I have a Roper snow blower with Tech. engine HM80 155326P. Initially it would run but it was constantly surging activating the governor arm on high idle.  I thought it needed a new throttle control so I replaced it and took the carb apart and sprayed it out with carb cleaner. But, after reading your responses I know I need to take it apart and soak it over night and rebuild it. Keep in mind I haven't taken it apart to soaked it yet. I put in fresh gas and a new spark plug and now it will only run on full choke.  When I move it to half choke it starts to stall so I choke it full and hit the prime once to keep it running. I went to the site you suggested to others and down loaded engine break down. One problem you keep writing H and L Idle screws and the break down doesn't show what is what. There is a nut and screw going through the bottom of the float bowl. Also there is one on the side of carb above the float bowl, and one on top of carb that adjusts a plate hooked to the governor on a rod all of these screws go through a spring what is what? Which ones do you adjust? Your help with this would be greatly appreciated.

John
-----Answer-----
 Hello John:

 Thanks for Bringing that Up. I hadn't Realized My Mistake. The High Air Mixture Screw is In the Carburetor Bowl in the Center of the Nut you Spoke of. Some Carburetors have Both the Low and High Side by Side on the Top Side of the Carburetor. The Screw Closest to the Engine Is Usually the High Air Mixture Screw on this Type Carburetor. The Idle(low) Air Mixture is the One on the Side at the Top and Goes Into the Carburetor. Some have the Idle Air Mixture Screw Going Vertically Into the Top of the Carburetor. The Idle Screw is the One that Moves the Throttle Plate. The Following is the Directions for Setting these Screws. **If the Carburetor was Soaked Overnight in Carburetor Cleaning Solution and the Passages Blown Out with Compressed Air, then we can Set the Air Mixture Screws. Turn Both Air Mixture Screws In Until Seated. **DO NOT JAM  SNUG ONLY** Turn Both Screws Out 1 1/2 Turns. Set the Throttle to Full Open and Start the Engine. Override the Throttle by Pushing the Governor Arm by Hand and Turn the High Air Mixture Screw(bottom of the bowl) In Until the Engine is Revving Properly. Now Slow Engine to Idle. Set the Low Air Mixture Screw so there is No Hesitation when Throttling from Idle to Full Throttle. Now Set the Idle if Required.** I do Remember you Said you Hadn't Soaked the Carburetor. You can Try the Settings and you Might be Lucky. Hope this Helps. I am here if you Require more Assistance. Let me know what Happens, Please. Thanks.

 Good Luck

 Respectfully

 John


Answer
 Hello John:

 Start by Turning them In. If the Engine Runs Rough or Quits then Return to the 1 1/2 Turns Out from Seat and Turn the Screw Out 1/4 Turn Until the Engine Revs Properly. the 1 1/2 Is Just a Starting Point. You May have to Adjust Either Way, But it should Not be Very Much. Most times 1/4 to 1/2 Turns Either Way Usually is Enough. You Push the Governor Arm so as to Increase Engine RPM's. Don't Hold the Revs Up, Just Adjust the Screw an then Rev Up and Let Return to Full Throttle. You are Setting the Air Mixture to Accept a Load without it Stalling or Flooding the Engine. The Dead Spot Can be the Idle Air Too Rich or Too Lean. If Open To Far, it Floods the Engine for a Second or Two and then the Engines RPM Catch Up to the Fuel Amount. If Closed Too Much, then there Isn't enough Fuel to Handle the Increased RPM's. Hope this Helps. I am here if you Require more Assistance. Let me know what Happesn, Please. Thanks.

 Good Luck

 Respectfully

 John