Small Engines (Lawn Mowers, etc.): Idles high then low, twin cylinder engines, compression stroke


Question
QUESTION: Thanks so much for your past help John!I am back again with the tecumseh OH195XA-71228 Revs high,then low,then dies.I cleaned carb overnight.Put a new kit with seat,valve and the works John.
But I had gas comming through the carb and gas in oil.I drained the oil..put another seat and valve in.Float is new.Now the oil
problem is gone.Plus the gas in the air filter has ceased 50%.
But it is still a problem.Plus this part where it Revs high,then low has got me stumped.It has always done that even before the
cleanings and after.So....I will await your response.Your the best.    James




doesent comepart is fine

ANSWER: Hi James:

>>Welcome Back.
>>You can View a Breakdown/IPL of this Engine at this Site Addy, http://www.partstree.com/parts/ and Enter the OEM Name and the Model Number in the Boxes at the Left of the Page Under the Heading "I don't know my Model!". Now Select the File you Wish to View.
>>I Just had Another Question about this Engine a Few Days ago. LOL.
>>Check the Valve Clearances. If the Valve Clearances are Not Correct you can have this Problem.
>>The Following is a Basic File I made for Setting the Valve Clearances. Any Input is Appreciated.
>>**I Do Not Use the Setting Called for by the OEMs. I have Found that the Following Works Best.
>>Remove the Valve Cover (on the Dead Cylinder for Twin Cylinder Engines).
>>Check the Push Tubes and make Sure they are Not Bent.
>>Set the Cylinder you are Setting the Valves on to Top Dead Center on the Compression Stroke When Setting the Valve Clearance. Now Loosen the Valve Adjuster Lock and  Using a Blade Style Feeler Gauge, Set the Intake Valve Clearance to .003in -.005in and the Exhaust to .003in - .005in. Loosen and Tighten the Rocker Arm and the Feeler Gauge is Placed Between the Rocker Arm and the Valve Top where the Rocker Arm Pushes on the Valve.
>>***BE SURE TO TIGHTEN THE ADJUSTER LOCK AFTER YOU HAVE THE PROPER VALVE CLEARANCE***
>>I have had Better Performance Out of the Mowers and Less Burnt Valves Using these Settings. Be Sure the Piston is at TDC on the Compression Stroke.**
>>If you Remove the Valve Cover and then Turn the Engine by Hand, you can Watch the Intake Valve Movement. When the Intake Valve Closes, the Piston will Just Starting the Compression/Power Stroke.
>>On Some Engines you can Us a Straightened Coat Hanger and Feel the Piston.
>>Be Careful and Don't Jam the Wire in the Cylinder. Usually the Piston will Push the Wire Out of the Spark Plug Hole with No Problems.
>>Lastly,
>>Did the New Kit Contain the O-Rings for the Main Nozzle Tube?
>>Is the Port in the Side of the High Speed Bowl Nut Restricted?
>>Again I would Like to Say Thanks for Returning.
>>As Always, If you Hit a Snag or this Does Not Correct the Problem,  I Hope to be Here if You Require More Assistance. Hope this Helps. Let me Know What Happens, Please. May the All Mighty Bless You and Yours. Be Safe and Happy. Thanks.

Good Luck

Respectfully

John

PS: I am Allowed to Answer 5 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



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

QUESTION: Your good partner!!!!!Idle Rev thing is gone.
Now I just still have the issue of the gas in the air filter.Like i said John I have replaced the seat and valve twice,and float once.I just dont know what it is.It seems to have slowed down once i have gotten it to warm up.But it's still a problem.The float doesen't seem to be binding on anything.Does it matter how far the valve goes down in the seat hole?
If you should think of any more ideas,please include the easiest way to get at whatever it may be.Tecumseh OH195XA-71228 Oh,by the way,I nominated you for president since your so good at these engines.Maybe you can straighten this country out :-)
Thanks for everything John.....you're appreciated!!!!!!!!!!
         James

Answer
Hi James:

>>Thanks, but Don't get me Started on Running the Country. LOL.
>>I'm Glad the Idling Problem has been Corrected.
>>The Needle Valve Seat Must be All the Way to the Bottom of the Port.
>>You can use a Small Drill Bit Slightly Small than the Outside Diameter of the Seat.
>>Make Sure the Flat Side of the Seat is Towards the Inside of the Port and the Rounded Side is Facing the Needle Valve.
>>Thanks Again for the Comments and Ratings and the Nomination for President. LOL.
>>Also, Thanks for using All Experts.
>>Till Next Time. May All Your Mechanical Problems be SMALL ONES and as Always, May the All Mighty Bless You and Yours. Be Safe and Happy.


Best Wishes and Good Luck


Respectfully


jbridger (John)