Hello All,

I have been searching this forum for various information regarding a Craftsman 6.75 HP Eager 1 Tecumseh Engine. I know the Craftsman Part number is 143.006706 and is discontinued. I downloaded the PDF for 4-11 HP Tecumseh L Type engines and checked the Craftsman cross reference section, but it begins with 143.2xxxx numbers. I have looked on the outside of the engine without removing the plastic shroud and Sears has a label stating it is a YTPX6.2071BA. The Sears Parts Website listed in other forums lists this as a Part Number 750819c and states it is no longer available.

Can anyone tell me how I can determine what Tecumseh model number engine I have? I am attempting to accumulate information on this mower so I can repair it myself.

The main issue I am having is the mower is a bear to start. Once it has been primed about 10 times, it will start and run about 30 seconds (at best) then die. It repeats the start, run 30 seconds and stop cycle about 3 times before it decides to maintain a good idle for about a minute, then it begins a varying cycle of low idle (to the point of almost dying) then returning to a regular idle. Occasionally, it will run fine for up to 5 minutes, in the driveway, without the air filter or housing on it. If I replace either one (the air filter is brand new) the engine begins idling up and down on its own.

Please let me know what information you may be able to provide me with regards to this matter.

Very Respectfully,

Kurt
Bloomington, IL:freak:

Remove the housing arounnd the engine. There will be a plate on the engine with the tecumseh numbers on it.

I worked on a similar motor and was about ready to give up on it, had the carb off several times with no luck. Turned out the vent in the gas cap was plugged, so check that first. Try running it with the gas cap removed. Sounds like the engine is straving for fuel. Have you ever had the carb bowl nut off. If the tiny holes are blocked it will not run properly. If you take the bowl nut off either empty the gas tank or pinch the fuel line to stop fuel from flowing in. There will be a few tablespoons of fuel in the bowl, so have a few paper towels handy. When you prime that many times the engine will run until the fuel primed in is gone. Check the primer bulb for cracks.
Keep us posted.
Dean

The engine on your mower is a Tecumseh Vector series engine, the corresponding Tecumseh mode number is VLV126-502533E.

The most likely cause of your issue are 2 little O-Ring seals in the carburetor, one on the nozzle and the other between the main jet and nozzle cavity.

The main jet is accessed via the drain screw on the side of the float bowl, there is a small spring under the screw, then the main jet (plastic) and finally the O-Ring. This one tends to swell up and shut off the fuel supply.

To access the O-Ring on the nozzle requires the float bowl to be removed from the carburetor body. To do this you will have to unsnap the retaining clip towards the rear of the carburetor and drop the float bowl off. There is a small O-Ring near the base of the nozzle that can deteriorate and allow air to be drawn up the nozzle instead of fuel. There is a small spring underneath the nozzle so be careful not to loose it, it's very important. Both O-Ring's are the same.

Best of Luck...:thumbsup:

I too have a Craftsman Mulching Mower with that crappy engine/carb setup. After draining the oil, replacing the blade, cleaning the mower top to bottom and replacing the spark plug and air filter and cleaning out the carb and replacing with fresh gas it still will not start. Compression seems good and it did try and start after spraying the intake with carb cleaner but man what a dog. I feel like riding this thing down the street until I hit something rendering it completely useless. Model Number 917.378420 Dunghole brown color with garbage plastic wheels.

At this time I can't get to a site where I can see the carb type for your engine, however, if your carb has the plastic tube extending into the air filter area your problem is, 1- you must make sure the bowl nut is clean, it can have 1-4 holes in it that will get clogged, 2- on this carb the bowl gasket(at the top) must be replaced whenever the bowl is removed( the primer doesn't prime if there is a air leak). Have a good one. Geo

I just got mine running again. I bought some new gaskets/o-rings and primer bulb. When I took it apart and there was no o-ring on top of the main jet but I put it in because I saw it in the diagram. It restricted the movement of the plunger so I took it back out and it fired up. It's a crappy carb but at least I did not have to spend the $80 for a new one or replace the mower. Thanks to all for the advice!

The engine on your mower is a Tecumseh Vector series engine, the corresponding Tecumseh mode number is VLV126-502533E.

The most likely cause of your issue are 2 little O-Ring seals in the carburetor, one on the nozzle and the other between the main jet and nozzle cavity.

The main jet is accessed via the drain screw on the side of the float bowl, there is a small spring under the screw, then the main jet (plastic) and finally the O-Ring. This one tends to swell up and shut off the fuel supply.

To access the O-Ring on the nozzle requires the float bowl to be removed from the carburetor body. To do this you will have to unsnap the retaining clip towards the rear of the carburetor and drop the float bowl off. There is a small O-Ring near the base of the nozzle that can deteriorate and allow air to be drawn up the nozzle instead of fuel. There is a small spring underneath the nozzle so be careful not to loose it, it's very important. Both O-Ring's are the same.

Best of Luck...:thumbsup:

This fixed my problem. The O-Ring in the main jet was pressed flat and resembled a flat piece of rubber rather than an O-Ring. It took some digging to get it out. If I didn't know it was in there from this post and the parts diagram, I might have never found the problem.

Thanks 30YearTech! I appreciate you taking the time to explain this issue.

I found this thread that is over 2 years old and it solved my problem.

THANKS 30yearTech. The o ring at the main jet was flattened and blocking gas flow. A trip to Ace Hardware and 59 cents later, it runs like new.

I had taken the carb apart twice and cleaned everything I could find. I was unaware there was an o ring hiding behind the main jet.

How did we survive without the internet?

Happy Trails

I found this thread that is over 2 years old and it solved my problem.

THANKS 30yearTech. The o ring at the main jet was flattened and blocking gas flow. A trip to Ace Hardware and 59 cents later, it runs like new.

I had taken the carb apart twice and cleaned everything I could find. I was unaware there was an o ring hiding behind the main jet.

How did we survive without the internet?

Happy Trails

Your Welcome! Glad the info helped everyone.