Small Engines (Lawn Mowers, etc.): yamaha 90cc 4 wheeler wont rev or go, carburetor body, adjustment screws

Question
hi i have a 90cc yamaha 4 wheeler 1998 model see when i start it up it idles fine but when i push the gas it bogs down and dies i replaced the spark plug and im for sure the carb gets gas i think the idle screw and mixture are off do you know the proper settings are.also isit possible im getting to much gas and its not burning it off quick enough thanks for your help


Answer
Hello Thomas:

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.**** It is Possible for the Carburetor to be Flooding, but a Good Soaking and Cleaning Should Correct this.  **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.** You can View a Breakdown/IPL of this Unit at this Site Addy; http://www.xtremepowersports.com/ATV_Parts__Where_America_goes_/atv_parts__where... and Select OEM Parts Diagrams at the Left of the Page. Then Follow the Instructions to Get to your Yamaha Breakdown/IPL. Send me the Model Numbers Off the Unit, Please. With these I can Locate the Proper Manual and Better Assist you. Example: 1998 Blaster (3JMS). We need to Eliminate the Carburetor as the Cause for this Problem. Once the Carburetor is Clean and if the Problem is Still Present, then the Model Information will Allow me to Locate the Proper Manual and Better Assist you. 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