1) Verify that the problem is, indeed, a lack of spark. Do this by removing the plug from its hole, and attaching the plug back to the wire. Then, take a length of wire with large alligator clips on each end, and clip one end to the threads on the plug, the other end to a stationary petal piece on the block. Pull the starter cord (without touching the plug set up!!) If you see a spark, then you have mis-diagnosed the problem.
2) Inspect your plug wire for damage, perhaps the plug peice is detached from the wire.
3) Inspect the Magnet thingy that the other end of the plug wire is attached to. Perhaps the wire is detached. It could be that it has accumulated dirt or rust. Maybe it needs an adjustment.
4) Check your kill switch.
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A good lawn mower spark plug will have just a small amount of brown deposit. In addition, the gap will be very close.
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Would you use lawn mower plugs in your car?? NO!!!!
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What is the gap on the spark plug on a Brigg's stratton lawn mower Model#31P777 Type 0348E1?
yes
1998 Simplicity ZT Series, manufacturer's number is 1692905
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.030
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