Question about John Deere 3010,3020 Tractor Basic Carburetor Repair

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I have a Marvel-Schebler carburetor, Model Tsx. My carb had needle brings in throttle shaft. When I removed throttle shaft the needle brings fell out. The kit does not have new bearing in kit. What is the fix. kit has rubber seals for each end of shaft, no bushens or bearings .

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Replace the caged needle bearings in the throttle housing

Posted on Jul 10, 2012

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There are no needle bearings in the carb, they came from someplace else. And I suspect a connecting rod. The only place I can think off where they could have come from. And I'll tell you why. I had a 66 Saab, 3 cyl, 3 carbs, 2 stroke,4 speed on the column, front wheel drive, rack and pinion steering, way ahead of it's time. Neat little car. Never got stuck. But, I had a problem once with a piston slapping, I could stick my finger in the spark plug hole and feel the piston come up and fall down, I said what the? So I replaced the engine, I had a spare. Took off the head and the top of the piston was just peppered with needle bearings from the wrist pin. How they got up there , I don't know, but they were there. Hope this helps.

Posted on May 06, 2010

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Troy-Bilt w/Tecumseh HMSK 80-110 engine. Where can I get a repair manual covering the carburetor OR a picture showing carb linkages?


There are a couple of reasons this could be happening.
1- The throttle shaft could be frozen or gummed up where the throttle shaft sits in the carburetor body.
2 - Check the top of the throttle shaft where the shaft meets the plate, if it is loose or separated it will not allow the throttle plate to move.
3 - The governor spool may be damaged internally in the engine.
Added a couple of Tecumseh manuals below.


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http://www.barrettsmallengine.com/manual/tecumsehcarburetormanual.pdf

http://www.barrettsmallengine.com/manual/tecumsehlheadmanual.pdf

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What are the settings on a Marvel-Schebler TSX 775 carburetor


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wot is the problem with the carb , they are very easy to rebuild !? place all bits on white paper , clean all parts and blow out the jets and all dirt in the carb and check the float needle is clean and no grooves on the tip and moves freely in place ! put floats in a bowl of fuel and make sure the float ! slowly re fit all parts , float level is approx flat wen carb is held upside down ! re fit and fuel up and hope you have fun ! P...

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1 Answer

No fuel is getting through my marvel schebler carburetor


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Have a John Deere 3020 with a Marvel-Schebler carburetor. Not staying running seems like its out of gas and it is getting fuel it runs a short wile and dies pump the fuel pump manual pump and it runs for...


Have you checked that your float is working properly in the carb? If it is sticking with the plunger shut it will block fuel inlet regardless of having fuel supply?

Have you checked to see if there is definitely fuel in the line at the carb when it's acting up?

Have you made sure that there is still spark when it quits running? You could have something that is grounding out when it warms up and makes it quit firing that while you 'fuss' with gas issues, cools enough to spark then fails again. Hard to say without more details. Also are you sure there isn't a clogged fuel filter in the tank, carb-inlet or inline somewhere?

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Marvel Shebler TSX 650 carburetor needs help


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1 Answer

I've inherited a 1985 Virago 1000 with 16000 miles on the speedo. It will only run rough with the choke on. I replaced the battery with a new one when I got the bike. Since then I cleaned the carbs,...


the carburetors will need thoroughly cleaned and related rubber vacuum and fuel hoses will need replaced. Use fuel rated hose on fuel lines.
Gasoline goes bad with time and in as little as 3-4 weeks. This effect is known as varnishing. Jets and passageways within carburetors become obstructed when varnishing occurs.
Liquid gasoline changes chemically into a gel like substance. Advanced stages of varnishing results with the solid gel changing into a crystal powder substance. Interior carb surfaces are etched in the process and may require carb replacement.
The choke and pilot circuits with most motorcycle carburetors share passageways. When pilot jets become obstructed, the choke circuit compensates and allows engine to start and idle with choke, but stalls without choke.

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FOR MORE HELP:---
Carb Cleaning 101
The elements of internal combustion engines are; correct fuel/air ratio, spark at right time, adequate cylinder compression. Motorcycle and ATV carburetors have many passageways and openings to check and clean. Subtle to radical effects on engine performance occur when jets and passageways become obstructed. Vacuum leaks and carburetor synchronization also effect performance and should be checked and adjusted. The following procedures are a helpful guideline.
Carb Cleaning 101:----Warning: Remove all rubber (Neoprene) parts before applying chemicals to carburetor parts. These parts usually include vacuum diaphragms, needle valves, o’rings, hoses, and other parts. Spray cleaners may damage these parts. Do not disassemble individual carbs from the carb brackets.
Air & Fuel Passageways: Trace individual fuel and air circuit passageways from beginning to end. Machines can only drill straight paths through castings to form passageways. A change of direction or angle means drilling additional connecting passageways. Access holes left by the drilling process are plugged with brass or bronze beads. Inspect and clean each passageway with spray cleaner, brushes, pipe cleaners, and compressed air. Many household items can be useful cleaning tools. Remove any discoloration and debris from carbs. Look for carb spray cleaner to exit from one or more passageways. Chase immediately with compressed air.
Jet Cleaning: Inspect jets by holding to light and look through them. You should see an unobstructed round hole. Clean the jets with one or more of the following; jet-cleaning wires, soak solutions, carb spray cleaners and compressed air. Re-inspect jets after cleaning and install when clear of obstructions. Some main jets have paper-like gaskets. Most have metal spacers between the jet and the emulsion tube. Some screw directly into a brass emulsion tube, which is machined for a 7mm wrench at its float chamber, exposed base.
Inlet Fuel Valve: Inspect the needle valve & spring. Press down the tiny metal rod that protrudes from the **** or float end of the needle valve. The spring should move freely and return the rod to its location. Check the needle valve’s seat area for a groove or other wear. It should appear highly polished. Some needle valve seats are rubber and wear may not be visible. Inspect the needle valve jet seat. You can clean the jet seat with Q-tips and semi-chrome polish if necessary.
Carb Body Castings: Blow air through the atmospheric vent holes located on the dome of each float bowl chamber. Air should exit via hoses or brass nipples. Inspect the emulsion tubes and passageways (cast towers that jets thread into) for discoloration and debris. Clean interior emulsion towers with a soft bristle gun cleaning brush. Clean each Venturi (main carb bore).
Needle Jets & Jet Needles: Clean the needle jets, jet needles, and emulsion tower (main jet screws into). Clean the emulsion tube (pipe between needle jet and main jet) (Main Jet may screw into emulsion tube). Jet needles are part of the throttle slides. See below…
Throttle Slides: There are several types of throttle slides: Mechanical linkage, vacuum, diaphragm, and cable. Disassembling the jet needle from the slide is not always required for cleaning. If you have vacuum piston type throttle slides (large diameter solid metal slide), avoid cleaning the lubrication from sides and caps. If piston type check cap vents and passageways with air. Clean if necessary and re-lube. If you have rubber vacuum throttle diaphragms, inspect for dry rot, defects, and tears by gently stretching rubber away from center. Do this until all areas around diaphragm have been inspected. Replace any defective part as described above. Clean carb body areas around diaphragm including air passageways and air jets. Diaphragms have a locator loop or tab fabricated into their sealing edge. Observe this locator upon reassembly. Avoid pinching the diaphragm when reinstalling caps.
Fuel Screws: Fuel screws have sharp tapered ends. Carefully turn one fuel screw in while counting the turns until it seats lightly. Warning: These screws are very easily damaged if over tightened into their seats. Record amount of "turns-in" and remove the fuel screw, spring, washer, and o'ring. The fuel screw is part of the enrichment (choke) circuit...clean passageways as described above. When carbs are assembled, spray low PSI compressed air into diaphragm air vents located at intake side of carbs. Throttle slides should rise, then fall when air is removed. Lightly lube external moving linkages. Reinstall carbs and follow through with carburetor synchronization.
Throttle Cables: Lubricate cables periodically. If cables are disconnected from carbs or removed for replacement, etc . . . remember cable routing and ensure proper reinstallation routing. Avoid bread-tying, sharp bends, and pinching cables. Adjust cables so throttle grip has about 5mm of play or throttle slides or butterfly valves may not open completely (full throttle)(wide full open).
Float Bowls: Inspect float bowls for sediment, gum or varnish, crystallization, and defects. Clean all pipes, tubes, passageways, and embedded jets with cleaners and compressed air. Remove and clean the drain screw and area. Inspect bowl gasket and replace if necessary. Clean and inspect overflow pipes and tubes, look for vertical cracks.
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2 Answers

How do I remove carburetor on 2005 Polaris Sportsman 700 Twin?


its kind of annoying but theres a few choices on the throttle theres the tip of the wire get it with some needle nose pliers and pull it out of its seat and some times theres a c clip inside of it and remove it pull the through and then your good and for the choke it has a screw on cap sort of deal put your choke on half choke and and twist the cap thing and pull the choke through. also if the carb is bad and you want to replace it you can also twist off the top cap of the carb and take the needle off ( to do so you must pull the spring up to releive tension and then you push the needle through and once you do that the rest of it is childs play any more questions ask me ) i assumed this is a fan cooled if liquid there are different types of polaris carbs for the liquids i advice you bring it to the dealership because most new polarises have a trouble code thing and if you mess with it it could set it off and you wont beable to drive or it could cause further problems

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