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6 yr old mower starts, won't run

Yard machine by MTD, i've replaced plug, filter, gas line...after priming 3x, it will start and run briefly and then won't start again until i wait a few minutes and prime again?

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  • 48 Answers

Sounds like a plugged high speed jet in carb - you can attempt to prime again , push at least 7-8 times - once it fires continue to push primer to keep running - it may clear out the carb if this doesnt work the carb will need to be removed and cleaned

Posted on Oct 21, 2008

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1 Answer

1 yr old -won't start this year


probably need to clean out carby and fuel tank

Jun 11, 2013 | Toro Power Lawn Mower

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My 5 hp MTD mower keeps stalling after running for a couple minutes. I then prime it excessively and it will start back up and do the same again. I have cleaned the carb and replaced the priming needle,...


You probably have already done this, but I had a JD 111 rider awhile ago and did most of the things you have done with no success. Then I replaced the fuel line and "BINGO" it worked great after that. Seems the line had a weak spot and would **** closed when trying to start.


Good Luck

Jul 10, 2011 | Yard Machines 11A54MC006 21Inch 139cc MTD...

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HI there, I got a lawn mower mtd yard machine briggs ans stratton 4,5 hp, it start pretty well but won't stay running, I change the spark plug, oil, gas brand new, clean the carburator, clean the air...


There could well be a build up of sediment and debris in the main jet to the carburetor. It is easy to get to and clean. It is the brass bolt that holds the lower float bowl onto the main body of the carburetor. To clean it, drain your gas. Remove the bolt and external washer UNDER the carburetor bowl. Clean out the bowl of any sediment and/or water. To clean the brass bolt, use no metal objects. Carb/Choke aerosol spray cleaner will do the job. Pay close attention to the hole in the bottom of the bolt and the very small holes about 2/3 of the way up the bolt. Clean till shiny with holes cleared and reinstall. Your fuel flow problem and shut off condition may be solved.

Jun 05, 2011 | Mtd 22" Yard Machine Push Mower

1 Answer

My mower will only stay running if I keep priming it. Bought it new this summer and only used it 5 times at 20 min.. I have replaced the gas. Same even if the filter is off so its not the filter.


You probably got gunk in the carb?
Dirty gas, bad can, old, etc, etc

Clean the tank really good, remove & replace the fuel filter, add new gas - After.... you clean out the Carb. Maybe even rebuild with an inexpensive kit you can get on eBay or Amazon.

Good Luck
Get part number from here:
Lawn Mower Parts Genuine MTD Parts for Outdoor Power Equipment

Sep 19, 2010 | Mtd 22" Yard Machine Push Mower

1 Answer

My mower starts and stays running for about 5 seconds then quits..has gas and oil any clues


Check gas line. Check for a gas filter and replace it. Replace spark plug. If the prob continues - it might need the carb rebuilt.. If a small engine sits to long without being run - the gas will shellac in the carb and render it to not function properly..

have a great day !

Apr 09, 2010 | Mtd 22" Yard Machine Push Mower

1 Answer

Lawn mower won't start


Did you set the plug gap to specs?
Check fuel line filter.
Empty gas a replace with fresh fuel.

Apr 06, 2010 | Mtd 22" Yard Machine Push Mower

1 Answer

Won't start. Mower was in storage and unused for 2 yrs. Replaced spark plug. Still won't start.


IF you are turning it over and getting spark then your not getting fuel
2 year old gas can turn to sludge plugging the filter in the gas tank clean the tank out - blow the fuel line from the carb. back to the tank- use fresh gas she should run

Mar 11, 2010 | Mtd Yard - Man 160cc, 21" Self - Propelled...

2 Answers

Won;t start


I got a new air filter for mine today, plus cleaned out the metal fuel canister under the carburator and the little brass bolt and my mower started right up. I was having hte same problems getting my mower to run and stay running. Glad I checked this site!

Sep 09, 2009 | Mtd 22" Yard Machine Push Mower

2 Answers

Lawnmower wont start


Possible Causes Corrective actions
Unit will not start Control handle is not engaged Engage control handle spacer.gif spacer.gif
Spark plug wire is disconnected Connect spark plug wire spacer.gif spacer.gif
Fuel tank empty or stale fuel Replace with clean, fresh gas spacer.gif spacer.gif
Blocked fuel line Clean fuel line spacer.gif spacer.gif
Faulty spark plug Replace, clean, or adjust gap spacer.gif spacer.gif
Engine flooded Wait to restart, do not prime spacer.gif spacer.gif
Air filter filled with dirt or debris Replace or clean air filter

May 23, 2009 | Mtd 22" Yard Machine Push Mower

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