QuestionI have a no name 50cc 2 cycle engined motorcycle. It has not been run in about 3 years. I have cleaned the fuel lines, tank, changed the spark plug and cleaned but did not adjust the carb. I can get the engine to start using starting fluid for about 3-4 seconds but it will not run longer than that. I am thinking that the carb is out of adjustment but I am not sure how to adjust it nor do I know the name of the engine manufacturer. The bike is chinese made but there is no name or engine plates on the engine. Is there some guideline that I can use to get the carb adjusted. Or perhaps something is wrong. Thanks for your help.
Ed
AnswerHello Ed:
>>If you have Not Soaked the Carburetor when Cleaning it, then it can Still Require Cleaning. Soaking is the ONLY Sure Way to Remove the Varnish that Builds inside the Carburetors Passages. Varnish Builds Up in Layers and Spray Cleaners Remove the Varnish in Layers. It Takes Many Times of Using the Spray Cleaners to Correctly Clean a Small Engine Carburetor.
>>I have Used as Many as 5 Cans of Spray Cleaner and Still had to Soak the Carburetor to get it Clean.
>>The Following is the Instruction File for Setting the Air Mixture Screws on Most Small Engines. Any Input is Appreciated. The Procedure is the Same for 1 or 2 Mixture Screws, Just Use the Instruction File and Skip Over the Section with the Missing Mixture Screw ( Usually the H Mixture Screw).
>>Now Setting the Air Mixture Screws:
>>****Turn the Idle Air (L) and Main Air (H) Mixture Screws In Until SNUG **Do Not Jam** Then Reverse Both Screws 1 1/2 Turns. Set the Throttle Full Open, Start the Engine.
>>Turn the Main Air (H) Mixture Screw Clockwise Until Proper Revs are Obtained. **Carefully Use your Finger and Move the Governor Arm to Rev the Engine (on Chainsaws and Trimmers Use the Trigger to Rev the Engine) Until you Reach Max RPMs (on Chainsaws and Trimmers, the RPMs are Not Set to MAX. Set to MAx and then Reverse the Setting Screw 1/4 or 1/2 Turn. If the H Mixture Screw is Set too High; the Engine will be Starved for the Oil in the Gas and Damage the Piston and Jug/Cylinder) and the Engine is Running Proper at Full Throttle Up a Grade. 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 (L) Mixture Screw so there is No Hesitation when Throttling from Idle to Full Throttle. Reset the Engine Idle if Required.****
>>Please, Do Not Hesitate, If you Hit a Snag, if I Missed Something 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. Comments and Ratings are Greatly Appreciated. Thanks.
Respectfully
John
