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Thread: honda mower, no spark

  1. #1
    Join Date
    Sep 2016
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    Modesto, CA, USA
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    honda mower, no spark

    I have a Honda vertical shaft lawnmower. it will not start, will not pop with starter fluid. I used a spark plug tester and got nothing. No visible spark even at night. I figure either a new coil or a flywheel key is sheared.
    On the old points engines a sheared key would mean no spark since the magneto voltage and points opening where out of range of each other.
    On a modern no points engine I think the coil would still make a spark wouldn't it? Just the spark would be out of time and no fuel mixture would be in the proper state to ignite.
    I am wondering if no spark definetley means the coil is bad or could it still mean a bad keyway so the flywheel and magneto has lost time with the points, or what passes for points these days.
    Bil lD

  2. #2
    Bill,
    I had this happen several years back to a 1984 Honda Push mower, it ended up being corrosion on the surfaces of the flywheel/coil interface. I used sandpaper to
    clean things up and this returned the spark. My shed where the mower was stored ended up with lots of water one spring, I feel the mower suffered lots of corrosion due to this. I still have the mower as a back up and it starts right up.
    Good luck,
    Mac

  3. #3
    Join Date
    Feb 2014
    Location
    Lake Gaston, Henrico, NC
    Posts
    2,427
    Google "adjusting coil on honda mower motor" , and you will find videos on fixing any of the few possible problems.

  4. #4
    Join Date
    Mar 2018
    Location
    Anchorage, AK
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    I had a small motor lose spark once. Ended up being the low oil safety switch. Somehow it went bad, and interrupted the start circuit. Checked oil, unplugged switch, and it started right up. Iíve also had the flywheel misalignment deal happen, but that was after I ran over a buried steel pipe and stopped the mower dead in its tracks.

  5. #5
    Join Date
    Feb 2007
    Location
    N.E. coastal, U.S.
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    In my experience, you can readily remove the flywheel retaining nut at the top of the crankshaft. Should be able to visualize those keyway grooves enough to judge if the flywheel key might be damaged without needing to actually pull the flywheel. Regardless, I happen to have the Honda of America authorized lawn mower Shop Manual at hand and it does show an ignition fault tree diagnostic guide that has specific recommendations regarding this problem.

    In the instance of testing for spark and observing none, it states: "check with a new spark plug", "check again with a new spark plug cap" (might also just verify good continuity with a meter if available), "locate the engine electrical stop switch & disconnect the black wire that grounds out spark, then recheck"; in that order.

    If after completing these procedures, there is still failure to detect any spark, we've arrived at: "Defective transistorized ignition coil" & "Replace transistorized ignition coil". My manual covers Honda models HR195, HR215 & HRA215 in particular and is dated, 1995 thru 2011. Might give these suggestions a try and pay particular attention to verifying good continuity in those conductive elements (clean plug, wire & plug cap) also don't forget about that electrical ground kill switch at the bottom end of the throttle linkage. Could simply be a bad stop switch mechanism shorting your coil-induced spark potential to ground.
    Last edited by Morey St. Denis; 05-18-2018 at 2:20 PM.

  6. #6
    Most likely your mower has several safety interlock switches, Before taking the motor apart, I would check the switches for continuity.
    Lee Schierer
    USNA- '71
    Captain USN(Ret)

    My advice, comments and suggestions are free, but it costs money to run the site. If you found something of value here please give a little something back by becoming a contributor! Contribute

  7. #7
    Join Date
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    Crown Point, Indiana
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    +1 on checking the safety switches and plugs. I had that happen last year.

  8. #8
    Quote Originally Posted by Lee Schierer View Post
    Most likely your mower has several safety interlock switches, Before taking the motor apart, I would check the switches for continuity.
    BANG!!! X 1,000,000.

    Check all the safety switches and their associated wiring first - especially the deadman handle grip switch. If it has a low oil switch - check it too.. There are probably safety switches on the self-propelled drive engagement and blade engagement if it had any of these - they prevent you from trying to start the motor while the blades are engaged or the drive is engaged.......

    These switches generally all work by grounding out the coil... So you get no spark.

    As another dumb item - make sure the spark plug wire isn't grounding out via damaged insulation on the wire... That one has gotten me many times..
    Last edited by John C Cox; 05-18-2018 at 6:38 PM.

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