QuestionHi John,
You recently gave me some valuable advice on getting the above engine running properly on my Merry Tiller rotovator. It is indeed now running, but just needs some finer tuning I think. When ticking over, it regularly "surges" slightly, and regularly. It's as if it is ticking over, and then it revs slightly, and then settles again, then revs again, and so on, of it's own accord. I have a carb serice kit on order, so will see to the carb when it arrives, I think the float needle is not seating properly, as fuel leaks from the carb with the fuel tap on, and engine off. Any ideas would be most welcome please. Many thanks.
John Forster.
AnswerHello Again John:
I Just Read your Comments. Thanks for the Ratings and the Good Words. I want Everyone to Feel as you Do. I Enjoy Knowing I have Helped Someone Save Time and Money. Till Next Time. May All Your Mechanical Problems be SMALL ONES and May the All Mighty Bless You and Yours. Thanks Again.
Best Wishes and Good Luck
Respectfully
John
Hello John:
Depending on How Fast the Gas is Leaking by the Needle Valve; this Can be the Cause of the Surging. Once you have Soaked and Cleaned the Carburetor the Surging Should Stop. However, I See by the Breakdown ( I Looked at 4 of the Models with Different Type Numbers) that this Carburetor has Both the Idle Air and Main Air Mixture Adjustment Screws. The Following Includes the Procedure for Setting these Screws. If they are Not Correctly Set the Surging will Occur Also. All the Carburetor Adjustments are the Same for Lawn Mower and Trimmers. There are Several Location for the Air Mixture Screws. The Idle Air Mixture Screws are Usually Located at the Top of the Carburetor Bowl and the Top of the Carburetor Body. If the Main Air and Idle Air Mixture Screws are Side by Side on the Side of the Carburetor, then the Idle Air is the Farthest from the Engine. The Main Jet Air Mixture Screw is Located in the Bottom of the Carburetor Bowl or Beside the Idle Air Screw on the Side of the Carburetor Body. Some of the Older Model Carburetors have the Main Jet Mixture Screw Straight in from the Top of the Carburetor Body (this is Rare anymore). If you have Cleaned the Carburetor (Disassembled and Soaked Overnight in Carburetor Cleaner (I Use Gunk). Then Blow Out the Passages with Compressed Air and Install a New Kit if Required. Now Setting the Air Mixture Screws: ****Turn the Idle Air and Main Air Mixture Screws In Until SNUG **Don 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.**** The Following is the Instructions for the Carburetor Cleaning. 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, Float Pin, Float 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. You can View a Breakdown/IPL of this Engine at this Site Addy, http://www.smallenginepartswarehouse.com/parts.asp and Select the Shop Online Parts Look Up. Then Select the Model Tab. Then Select the OEM and Enter the Model Numbers. Then Double Click on the Model in the Results Area. Now you can Select the Section of the Engine you Wish to View. You Need the First 4 Numbers of the Type Code when Looking Up your Engine Breakdown. Hope this Helps. I am Here if You Require More Assistance. Let me Know What Happens, Please. 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 you Question at or Just After 9pm EST (US). My New Day Starts then. Thanks.
Respectfully
John
