Small Engines (Lawn Mowers, etc.): Honda engine throttle problems, twin cylinder engine, carburetor body


Question
QUESTION: I have a small utility vehicle with a Honda 100cc single-cylinder engine, and for some reason it starts fine, runs about 10 feet or so, then stalls. I replaced all seemingly obvious causes (spark plug, oil, correct gas) but it still seems to do this even under no load at all, and sometimes it just stalls under throttle and goes nowhere. I thought the engine may be no good anymore, but my father's motorcycle's engine started doing the exact same thing (although it is a larger twin cylinder engine). Any fixable cause to this?

ANSWER: Hello Elliot:

Send me the Model and Type or Spec Numbers Off the Engine, Please. With these I can Locate the Proper Manual and Better Assist you. It May be the Carburetor Requires a Good Soaking and Cleaning. You can View a Breakdown/IPL of the Mower/Engine at this Site Addy, http://hayward.arinet.com/scripts/EmpartISAPI.dll?MF&app=ASP&lang=EN&TF=Mainfram and Select the Catalog American Honda.  **Remove, Disassemble and Soak the Carburetor Overnight in Carburetor Cleaner (I Use Gunk). I have Found that Most People can Use a Breakdown/IPL and Disassemble the Carburetor Enough for Proper Cleaning. You Only have to Remove the Bowl (if Applicable), Float Pin (if Applicable), Float (if Applicable)  and Needle Valve and Any Adjustment Screws that Go Into the Carburetor Body. The Welch Plugs Do Not have to be Removed. Then Soak the Carburetor Body and Parts in a 1 Gallon Can of Gunk Carburetor Cleaner Overnight. The Can has a Parts Tray Inside it for the Small Parts. Once the Carburetor and Parts are in the Cleaner, you can Replace the Lid for Safety and to Prevent Accidental Spillage. Then Blow Out the Passages with Compressed Air. Install New Parts if Required.** If you Hit a Snag or this Does Not Correct the Problem,  I am Here if You Require More Assistance. Hope this Helps. Let me Know What Happens, Please. May the All Mighty Bless You and Yours. Thanks.

Good Luck

Respectfully

John

PS: I am Allowed to Answer 10 Questions a Day. If you See I am Maxxed Out, then Try Submitting your Question at or Just After 8pm EST (US). My New Day Starts then. Thanks.

Respectfully

John

---------- FOLLOW-UP ----------

QUESTION: John,
    Thanks for your help. I will try cleaning the carburator, and in the meantime the engine make/model is a Honda GX 110 (pull start), and if you have any more advice to offer, that would be great.
         -Elliot

Answer
Hello Again Elliot:

This Carburetor May have Air Mixture Screws. I Looked at the GX110 DA Engine and the Carburetor Mixture Screws are as Follows; Idle Air #6 and Full Throttle #8. If #8 (Full Throttle/Main) Screw Does Not have a Spring Around the Threads like the Idle Air, then it is NOT Adjustable, just the Idle Air is Adjustable. Use the Section of the Following Instructions that Pertain to Setting the Aire Mixture Screws that Pertain to your Engine.  Now Setting the Air Mixture Screws:  ****Turn the Idle Air and Main Air Mixture Screws In Until SNUG **Do Not Jam** Then Reverse Both Screws 1 1/2 Turns. Holding the Throttle Full Open, Start the Engine. Turn the Main Air Mixture Screw Clockwise Until Proper Revs are Obtained. Occasionally you May have to Turn this Counter Clockwise to Achieve the Proper Revs. Now Allow the Engine to Idle. Set the Engine Idle Screw (Not Idle Air) so the Engine will Stay Running if Required. Now Set the Idle Air Mixture Screw so there is No Hesitation when Throttling from Idle to Full Throttle. Reset the Engine Idle if Required.**** If you Hit a Snag or this Does Not Correct the Problem,  I am Here if You Require More Assistance. Hope this Helps. Let me Know What Happens, Please. May the All Mighty Bless You and Yours. Thanks.

Good Luck

Respectfully

John

PS: I am Allowed to Answer 10 Questions a Day. If you See I am Maxxed Out, then Try Submitting your Question at or Just After 8pm EST (US). My New Day Starts then. Thanks.

Respectfully

John