Question about Tecumseh Lawn Boy Push Mowers Insight Silver Powered Series - Sens - A - Speed Walk Behind Mower - 10685

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Won't stay running

I have a Tecumseh 4.5 hp, 148 cc push mower that I cannot get to stay running. Starts great, but once its warmed up, will die with greater & greater frequency.

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Check the gas cap vent. A partial vacuum in the tank will cause these symptoms.

Posted on Nov 02, 2009

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Will start but will only stay running if you prim it until its warm then runs fine


Lawn Mower Repair pt.1: starts & dies, Tecumseh/Craftsman ...

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Spray with starting fluid and the engine runs a bit longer but dies.... I especially like how you use the gas can to hold up the mower, Classic :) ... After I started it up, it would only stay running for a few seconds before dying. .... LAWNMOWER REPAIR: briggsand stratton pulsa prime carb overhaul - Duration: ...

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This is a how to video on what to do if your gas mower starts up then dies after a ... I have a different lawnmower and not very mechanical but this got my ... Got the job done and now i can do a thorough cleanout of it when i run it dry of gas. .... How to FixBriggs & Stratton Small Engine that Only Runs Off the ...

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1 Answer

Tecumseh 13hp overhead valve snowblower engine starts fine than sputters and dies, replaced the carb with new and exact same symptoms, Lots of fuel at the carb.


Make sure the fuel is good. Ethanol laced fuel starts to varnish after 20 days and is no good by 30 days, it also attracts water. Be sure you have good fresh fuel, then try a new spark plug.

Oct 19, 2012 | Tecumseh Lawn Boy Push Mowers Insight...

1 Answer

07 mtd yardsman mower with 13.5 tecumseh runs great untill engage mower , then dies down and blows black smoke


This sounds like a micro switch acting up, the first switch to check is the seat switch, make sure the block connecter is pushed fully home on the switch ( there is often a fail safe inside the connecter should the block come away from the switch )

Jul 08, 2012 | Garden

1 Answer

JS20 walk behind wont stay started


hello,After it stalls take the fuel cap off and put it back on and see if it starts,maybe the cap is bad or clogged and not letting air in to equalize the pressure of the fuel being used in other wards a clogged vent, this is a small thing but a big problem,,hope this helps, ``

Feb 17, 2012 | Garden

1 Answer

After about 15 to 30 minutes, engine starts pinging (for a few seconds) then dies


Not familiar with tecumseh lawn boy. Lawn boys I worked on were 2 stroke, if this is the case the crank seal is sucking air after engine warms up. New seal would fix. If you can't do it you're self may not be economically worth it.

Sep 28, 2010 | Tecumseh Lawn Boy Push Mowers Insight...

1 Answer

I have a Yardman 22" push mower Model 11A-084E029 B&S 158 cc engine I bought new. It starts and rungs great the first time I use it. When I go to use it again in a couple of weeks it will not stay...


still your gas could be not good for a small engine like a push mower. check your local content of ethanol in you area. ethanol is very,very,very bad for small engines. ethanol(alcohol) over time creates moisture in the gas and moisture(water) dont burn. I say check you local gas station or go buy gas other place. look around for special gas like for fleet. empty all gas and remove carb. bowl and fill with new gas.

Aug 14, 2010 | Mtd 22" Yard Machine Push Mower

3 Answers

I would push the prime button 3 or 4 times it starts then quiet


I took my carburetor off and blew it out with compressed air. Runs great now. Make sure to get all of it. Little screw on bottom has a hole in it too!

Apr 18, 2009 | Tecumseh Lawn Boy Push Mowers Insight...

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