One cylinder not firing

The only thing left is air leaking in to fuel lines.

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

Hope this helps,
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www.netidme-openid.com/reaches/tecumseh-tvt691-manual-orviyra.pdf

If it not getting gas or is not fireing the fuel pump must be working or the other cylinder would not be getting gas sounds like rings bad or head gasket but make sure it is getting fire first

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!

clean the flywheel, and the contact area on the coil. if this doesn't fix it then you need a new coil.

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....
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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.
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

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

The carburetor may need to be serviced. You need to find a parts shop that handles Tecumseh parts. You will most likely need a rebuild kit for the carburetor. The carburetor part number is 640303. The rebuild kit is 632809. The Tecumseh engine company shut its' doors 3 years ago. Finding parts is becoming harder and harder. I've heard that someone has bought Tecumseh over the winter but it is unknown when the new parts will hit the market. Best of luck to you.

Go to a tecumseh website and get a breakdown of the parts list and that should help a bit. Good luck.