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3.5hp Tecumseh blows gas out the carb while running very poorly?

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Out of time. Check the flywheel, there is a sheer key, if it is partially bent it will cause the incorrect timing to blow gas out of the carburetor.

Posted on Sep 25, 2017

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  • 119 Answers

Rrebuild carburator.

Posted on Sep 25, 2017

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6 Suggested Answers

6ya6ya
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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

trippssmengi
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SOURCE: tecumseh 9hp craftsman snowblower will not stay running

First take the carb off of the engine and then remove the bowl, carefully take the float off paying special attention to the needle and how it is attached to the float. Next, lightly blow air into the fuel inlet while holding your finger over the spot where the needle goes in. Use a bread tie with the paper scraped off. Stick the wire through the pick up tube at the bottom of the carb. Find any other holes and probe those holes with the wire. Then thoroughly wash the entire carb with carb cleaner then blow the whole carb off. Then put the float and needle back in making sure that when putting the bowl back on that it seats tightly all the way around the rubber gasket. Also, just before you put the bowl on turn the carb upside down to see if the float is sitting level. If it is put the bowl on, If not then the spot where the needle sits on the float has to be bent one way or the other just a little until the float sits level. After the bowl is put in place, the nut that holds the bowl on the threaded area should have two possibly three holes plus the hole down the center, probe all holes with the wire. put everything back on the motor and try again. If it still won't run then you will need a carb kit.

Posted on Dec 27, 2008

  • 356 Answers

SOURCE: oil blows out of tube

You either have a head gasket going bad or your piston rings are shot which causes air to go down into the crankcase building up pressure which exits through the breather tube.

Posted on Feb 01, 2009

plkruger
  • 32 Answers

SOURCE: Backfire Tecumseh Generator

To maybe convert your Flamethrower back to a generator, Make sure the fuel line is a good quality thick rubber material (like OEM )since it passes through the engine,HEAT is a issue, if it has been modified to steel, or it's thin rubber, it will overheat the fuel on its way to the carb and cause backfires after the engine warms up , ( vaporizing gas and pressure bypassing the jets flooding the engine) I use 1/4 inch Goodyear sold at Autozone , one of very few name brand quality parts you can get there. The other possible cause is carbon deposits built up on the leading edge of the valve not allowing the valve to close all the way, just clean the valve, it is caused by too lean or rich carb setting or clogged jets, if it is a newer style carb with a pink main jet then debris in this area will always cause backfire, check and make sure the old tiny O-ring on this jet is not still in the bottom of the shaft, people forget to pull them out all the time or give up trying to pull them out, I use a paper clip and bend the end 1/8 of a inch @ 90 degrees to fish hook it out of there, CLEAN THE SHAFT with carb cleaner and a Q-tip.... A Tecumseh engine will always backfire if the carb or airflow is not perfect and sealed tight !!!!!! it looks simple to rebuild the carb but you must take your time and look close, clean it very well, make sure the jet is SEATED properly and all tiny holes are clean, use guitar string not torch head cleaners as they will enlarge the holes and make your carb run rich.

Posted on Feb 05, 2009

  • 91 Answers

SOURCE: 5hp b&s mtd chipper wont start

defiantly the carb but its not bad - clean / soak it with some seafoam and blow out all the holes. its just clogged and isnt getting the fuel/air mixture right.

Posted on Mar 30, 2009

  • 81 Answers

SOURCE: tecumseh HM80 engine, new carb, won't run

Not the solid state ignition. If this were the problem the engine wouldn't start at all. There is some adjustment needed to the carb but without more info, I'm not sure what.

Posted on Jun 17, 2009

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1 Answer

I just bought a Ariens old snow blower Mod#ST504. It is 5hp. Mod# 932006, Ser# 023321. I need a new carburetor the only # I found on the 7389j7 it does not match any # on line?


You need to look at the Oregon brand of replacement parts as Tecumseh shuttered operations in 2009... Oh and those aren't Tecumseh numbers

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Clean the plug, clean the air filter, make sure there is clean fresh gas in the mower. If it has been sitting all winter with old gas in it, it may have gummed up the carb, but try the above before you venture into rebuilding the carb.

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Sounds like the Needle valve in the carburetor is stuck 'down' letting gas continually run from gas tank into carb. When the valve can't go up (Close) gas will run past the carburetor and into the crank case I bet your oil is full of gas. Check oil level see if it is overfull

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Take off the screw that holds the carburetor bowl on and clean the holes with a needle and blow air through them. These holes feed gas from thr bowl into the carb and may be clogged.

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All I want is a manual to make my own repairs if needed. This rototiller has set for several years. It fires but will not run. The gas is in the carb. How do I get the fuel tank off to get it clean and...


Purchase a repair manual at your local Tecumseh Authorized Service Center.

I suggest you get this engine professionally serviced before you strike out on your own. I recommend you treat the fuel with stabilizer as this piece of equipment is definitely seasonal.

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Remove the fuel line from the carb. Drain fuel tank and blow thru fuel line until clear. If you use compressed air be very careful to use LOW pressure. I just use my mouth. reinstall fuel line replace the fuel filter, add a new spark plug for good measure and refill gas tank

You should be chipping away right soon!

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