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  1. #1

    Join Date
    Oct 2012
    Posts
    2
    Location
    Tennessee
    Mower
    LX426

    Toro LX426 Issue

    I have a 5 year old Toro LX426 that has been a great mower until recently. On Saturday I was mowing the yard and it started to make loud popping sounds (almost like firecrackers) and then I started to lose compression. I changed the spark plug, oil, oil filter, fuel filter, and air filter, but it didn't help. The engine is cranking and I am getting sparks, but it isn't turning over. Any ideas before I have to take it to a service center and spend money I really don't have?

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  3. #2

    Join Date
    Mar 2012
    Posts
    5,221
    Location
    Wisconsin
    Mower
    Toro

    Re: Toro LX426 Issue

    Let me repeat a post from another thread that might just get you the help you need. Please follow it.


    Since this is a help forum, it is only fair that the people trying to answer questions have some information to work with, so they can give an accurate answer. This helps them if they need to research parts or service information on your engine or equipment. In the first part of your post please include your engine numbers from the ID tag or stamping and the equipment type and model numbers that are on it. Failure to do this may result in you not receiving any accurate help with your problem.

    Many of the tech's that hang out here work in or have there own shops and the first thing they do when they make up a work order on a unit is include the engine and equipment numbers on the work order. Since this technical forum is offered free to the public, it's the least we can ask you to do, so please help all of us out. *So please post the numbers in the new topic you start to ask your question. It should be the first thing you write before beginning your question. :D

    Got some ideas as to the problem, but until I. Know what engine you have I don't want to guess.

  4. #3


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    lawn mower fanatic's Avatar
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    Re: Toro LX426 Issue

    Quote Originally Posted by ego_id View Post
    I have a 5 year old Toro LX426 that has been a great mower until recently. On Saturday I was mowing the yard and it started to make loud popping sounds (almost like firecrackers) and then I started to lose compression. I changed the spark plug, oil, oil filter, fuel filter, and air filter, but it didn't help. The engine is cranking and I am getting sparks, but it isn't turning over. Any ideas before I have to take it to a service center and spend money I really don't have?
    to LMF, I hope you find a solution to your problem soon!
    -lawn mower fanatic

    Equipment:
    4x6 utility trailer
    Honda HRX217HYA mower---Honda HRR216TDA mower---Craftsman 24" 179cc dual-stage snow blower---Echo SRM-225 trimmer---Echo GT-2100 trimmer---Echo PB-255LN handheld blower---Echo PE-225 edger---Black and Decker 22" electric hedge trimmer

  5. #4

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    EngineMan's Avatar
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    Jun 2012
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    1,596
    Location
    South Wales UK
    Mower
    No mowers

    Re: Toro LX426 Issue

    Check Carburetion
    Before making a carburetion check, be sure the fuel tank has an ample supply of fresh, clean gasoline.
    Be sure the shutoff valve, if equipped, is open and fuel flows freely through the fuel line. If fuel
    fails to flow or is slow, check for plugged fuel cap vent, fuel line restriction or plugged fuel filter.
    Be sure throttle and choke controls are properly adjusted.
    If engine cranks but will not start, remove and inspect the spark plug.
    If plug is wet, look for:
    Over choking
    Excessively rich fuel mixture
    Water in fuel
    Float needle valve stuck open
    Plugged air cleaner
    Fouled spark plug
    If plug is dry, look for:
    Leaking carburetor or intake manifold gaskets
    Gummy or dirty carburetor, fuel filter, fuel lines or fuel tank
    Float needle valve stuck closed
    Inoperative fuel pump (if equipped)
    Inoperative fuel shut off solenoid (if equipped)
    A simple check to determine if the fuel is getting
    to the combustion chamber through the carburetor is to remove the spark plug and pour
    a small quantity of gasoline through the spark plug hole. Replace the plug. If the engine fires a
    few times and then stops, look for the same conditions as for a dry plug.

    Testing Fuel Shut Off Solenoid
    The fuel shut off solenoid is controlled by the equipment ignition switch. With the switch OFF,
    the solenoid plunger closes, stopping the fuel flow at the fixed main jet. With the switch in the
    ON and START positions, the solenoid plunger opens, allowing normal fuel flow. If operating
    properly, the solenoid will click when the switch is turned ON and OFF.

    Check Compression..!

    Possible Causes for Poor Compression:
    • Loose cylinder head bolts
    • Blown head gasket
    • Burned valves, valve seats and/or loose
    valve seats
    • Insufficient tappet clearance
    • Warped cylinder head
    • Warped valve stems
    • Worn bore and/or rings
    • Broken connecting rod
    "Information/Knowledge not shared will be lost for ever, now that I'am over 60 I will give freely any information that will help you out, you don't have to take it, that is up to you...! the word "thank you" will not cost you anything, so be nice sometimes and use it now and then"

  6. #5

    Join Date
    Aug 2012
    Posts
    822
    Location
    California
    Mower
    TMW REPAIR & THE MUSICIANS WORKSHOP RECORDING STUDIO

    Re: Toro LX426 Issue

    Loud popping noise? Is the sound coming from the exhaust or the carb (air filter)

  7. #6

    Join Date
    Oct 2012
    Posts
    2
    Location
    Tennessee
    Mower
    LX426

    Re: Toro LX426 Issue

    And friend of mine and I took the casing of the engine off to see if there was anything else going on and we spotted the piston looks bent. Any idea about what it would cost to replace? It is a Briggs and Stratton 20hp 12volt.

  8. #7

    Join Date
    Aug 2012
    Posts
    822
    Location
    California
    Mower
    TMW REPAIR & THE MUSICIANS WORKSHOP RECORDING STUDIO

    Re: Toro LX426 Issue

    Quote Originally Posted by ego_id View Post
    And friend of mine and I took the casing of the engine off to see if there was anything else going on and we spotted the piston looks bent. Any idea about what it would cost to replace? It is a Briggs and Stratton 20hp 12volt.
    Huh?? Can you post a photo?

  9. #8

    Join Date
    Mar 2012
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    5,221
    Location
    Wisconsin
    Mower
    Toro

    Re: Toro LX426 Issue

    I you post the engine model numbers it would help us give you an estimate. Pictures would also help, as many of us would like to see what you mean by a bent piston. I for one cannot remember seeing one.

  10. #9

    Join Date
    Apr 2014
    Posts
    2
    Location
    Michigan
    Mower
    Toro

    Re: Toro LX426 Issue

    Quote Originally Posted by chance123 View Post
    Loud popping noise? Is the sound coming from the exhaust or the carb (air filter)
    I'm no expert but, what he describes reminds me of when the timing was off on another mower I had, and, in the past, had cars with similar problems

  11. #10

    Join Date
    Jul 2014
    Posts
    2
    Location
    Ontario
    Mower
    Toro

    Re: Toro LX426 Issue

    Quote Originally Posted by flv819 View Post
    I'm no expert but, what he describes reminds me of when the timing was off on another mower I had, and, in the past, had cars with similar problems
    Found this link interesting to read about timing and causes for some of the symptoms described: Lawn Mower Timing

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