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  1. #1

    Join Date
    Aug 2012
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    7
    Location
    Florida
    Mower
    MTD - Yard Machines

    Briggs and Stratton 18 hp Twin II not getting spark

    I have a MTD lawn tractor with a Briggs and Stratton 18 hp twin II engine. I'm not getting any spark to the plugs. I know there are safety switches but I don't know where they are at. I know there is supposed to be one at the seat and one at the brake but I don't know where. This is approx 2002 tractor - 42" cut, B&S model number 42A707. Thanks for any help in advance!

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  3. #2

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    Re: Briggs and Stratton 18 hp Twin II not getting spark

    Remove the blower housing, and unplug the wire going to the ignition module. Crank engine and see if you have spark. If no spark, replace the module. If you have spark with the wire unplugged then check the clutch switch, located either under the frame next to the rod for the brake, or just inside the dash housing between the steering rod and the engine on the left side on top of frame. The pto switch which is located most likely under the transmission tunnel between your legs if sitting on seat, if not electric clutch. I think you know where the seat switch is located.

    The PTO and clutch switch most likely prevent cranking in the first place, but have seen stranger things. If iswitches check out then you will have to look for bare wires, or shorts in the kill circuit. Mice have a tendency to chew the insulation off of the kill wire under the blower housing causing shorting of the kill wire to the sheet metal.

    I hope this helps.
    ILLINOIS ENGINE, BEECHER CITY, IL
    BRIGGS AND STRATTON MST (MASTER SERVICE TECHNICIAN)
    Sales and Service for Dolmar, Poulan, Briggs and Stratton, Kohler, Lauson(Tecumseh, LCT), Generac, Brute.
    Warranty service for MTD, Murray, Powerwasher, Karcher, Mcculloch, Earthwise, Earthquake, Yamaha engines, Sanborn(powermate, Kobalt), Southland, Hisun, American Sportsworks, Worx, Rockwell Tools, Great Lakes Technologies products(Wen, CZ), Efco, Snap-On pressure washers, and others.

  4. #3

    Join Date
    Aug 2012
    Posts
    7
    Location
    Florida
    Mower
    MTD - Yard Machines

    Re: Briggs and Stratton 18 hp Twin II not getting spark

    Quote Originally Posted by ILENGINE View Post
    Remove the blower housing, and unplug the wire going to the ignition module. Crank engine and see if you have spark. If no spark, replace the module. If you have spark with the wire unplugged then check the clutch switch, located either under the frame next to the rod for the brake, or just inside the dash housing between the steering rod and the engine on the left side on top of frame. The pto switch which is located most likely under the transmission tunnel between your legs if sitting on seat, if not electric clutch. I think you know where the seat switch is located.

    The PTO and clutch switch most likely prevent cranking in the first place, but have seen stranger things. If iswitches check out then you will have to look for bare wires, or shorts in the kill circuit. Mice have a tendency to chew the insulation off of the kill wire under the blower housing causing shorting of the kill wire to the sheet metal.

    I hope this helps.
    We want to tell you that we really appreciate your help. We went from thinking it was a fuel problem to it involved an ignition problem instead. Your original response to the carberator/fuel problem was appreciated. Well it turned out that your first sentence in my question about the spark problem was the key.....Thank You!!! I replaced the module. The guy that I've been talking to here told me that this is the most common problem to this model. I can't thank you enough for your help. I was so puzzled I lost sleep. I can usally fix anything so I really needed input. I mowed my lawn tonite!! I will seek your help in the future if I have a problem. Hopefully.....I'm good. God Bless

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