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One cylinder not firing

I have a tecumseh tvt691 twin cylinder with twin carburetors on a murry mower.rh cylinder not firing all the time. check ignition coil with spark tester. spark is good. checked flywheel key. checked pushrods and valve settings.installed new sparkplugs. installed new carburetor on rh side. still not hitting on that cylinder. exhaust pipe on that side stays warm but not hot to the touch. about to trash

Posted by Anonymous on

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  • 48 Answers

Is the plug not firing? Can you check to see that it's actually firing at the tip? There are YouTube videos to show you how. Swap the two plugs to see if it is still a problem. If it is it you can rule out a bad plug. Do you have good compression? If the plugs are firing every time, then you may have a stuck valve or a problem with getting fuel into the cylinder.

Posted on Aug 04, 2017

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Posted on Jan 02, 2017

braintrust
  • 62 Answers

SOURCE: i have a 20 hp poulan riding mower with a two

sounds like you have a broken valve, you need to take it in and have a new valve put in, check compression you will get different readings, anyway needs to be taken in and have a professional look at it

Posted on Oct 27, 2009

  • 13 Answers

SOURCE: my tecumseh engine 5hp leaks gas threw the carburetor to the airf

stuck needle valve or bad float in carb.

Posted on Mar 27, 2010

adadoug
  • 682 Answers

SOURCE: Tecumseh TVT691 not getting spark in one cylinder

Did you check for spark of assume that since the spark plug was not dirty that it is not firing. I am leaning toward water in the gas since you have to keep the choke on and it is blowing white smoke. You may want to drain the fuel tank and carburator and put in fresh gas. Good luck!

Posted on Dec 30, 2011

  • 6468 Answers

SOURCE: Replaced sparkplug, solenoid, and battery - riding mower still won't start

check for spark if none remove the harness from the engine and crank it if you then get spark check the safety switches

Posted on Apr 24, 2012

  • 3 Answers

SOURCE: 2000-2001 craftsman 20.5 twin cylinder riding mower no spark.

Possibly the safety switch under the seat is faulty.

Posted on Apr 10, 2013

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You may already know that Tecumseh ceased business about 2008. It seems Barrett Small Engine has some of the literature on Tecumseh engines & parts. Try this link: http://www.barrettsmallengine.com/tecumseh/parts.html

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Tecumseh TVT691 not getting spark in one cylinder


Did you check for spark of assume that since the spark plug was not dirty that it is not firing. I am leaning toward water in the gas since you have to keep the choke on and it is blowing white smoke. You may want to drain the fuel tank and carburator and put in fresh gas. Good luck!

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Hi knobbe69
Time to "mess" with your carburetor...sounds like that is where the problem lies...
I will include my instructions on the carburetor rebuilding....
---------------------------------------------------------------------------------------------------------------------------------------------
Check to make sure you are getting fire/spark at the plug, if so then do the following:
Check/Clean/Replace your fuel filter if you have one, normally they will be located in the fuel tank.
If the mower/weedeater is over a year old, then I recommend that you buy and install a new carburetor repair kit,because the diaphragm will get hard and that will cause it to be hard to crank.
Sounds like you will need to clean the carburetor or replace your carburetor internal rubber parts like the diaphgram and O rings.
Be sure to use compressed air to blow out all the fuel and air passages.
Be careful when blowing out the passages, because there are sometimes small rubber type seats in the bottom of some of the passages.
Sometimes you can get by with priming the carburetor or using starting fluid and letting it run a few times like that and it will flush the gunk out of the jets,but most of the time you will need to rebuild the carburetor.
Keep in mind that the float for the carburetor must be level when you go to reassemble the carburetor or follow the instrucitons you get with the carburetor kit.
When you clean your carburetor and remove the jet screws, you will first need to lightly seat the jet screws.
But before you lightly seat the jet screws count the number of turns it takes to seat the jet screws from their original position.
Be sure to mark the turns down on a piece of paper.
That way when you put the jets back in, you know to lightly seat them first and then turn them back out to their orginal position before you started.
This is a FREE answer,Please rate me

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Check to make sure you are getting fire/spark at the plug, if so then do the following:
Check/Clean/Replace your fuel filter if you have one, normally they will be located in the fuel tank.
If the mower/weedeater is over a year old, then I recommend that you buy and install a new carburetor repair kit,because the diaphragm will get hard and that will cause it to be hard to crank.
Sounds like you will need to clean the carburetor or replace your carburetor internal rubber parts like the diaphgram and O rings.
Be sure to use compressed air to blow out all the fuel and air passages.
Be careful when blowing out the passages, because there are sometimes small rubber type seats in the bottom of some of the passages.
Sometimes you can get by with priming the carburetor or using starting fluid and letting it run a few times like that and it will flush the gunk out of the jets,but most of the time you will need to rebuild the carburetor.
Keep in mind that the float for the carburetor must be level when you go to reassemble the carburetor or follow the instrucitons you get with the carburetor kit.
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Be sure to mark the turns down on a piece of paper.
That way when you put the jets back in, you know to lightly seat them first and then turn them back out to their orginal position before you started.
This is a FREE answer,Please rate me

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