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16.5 Briggs Twin- No spark, no matter what

Wiredright's Avatar
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08-26-05, 10:15 AM   #1  
16.5 Briggs Twin- No spark, no matter what

I have a murray riding mower with a 16.5 Twin cylinder briggs&Stratton that I cannot get spark.

The history of it is this:

It belonged to the neighbor, who neglected it. He let me use it when mine broke (since fixed it) I had to dissasemble the carb, clean it up, get it running. No problems, and it ran fine for a couple of mows. One day, I shut it down to go get a fresh beer (mowing aid) and when I came back it wouldn't start back up (no spark) checked everything, including all the shut off circuits (ie. won't start without someone in seat, blades disengaged, clutch pedal in ) and forget about it. No spark. I gave it back after a week of fooling with it and said I give up, no more time to mess with it.

Fast forward a year later. He has someone come by to look at it, they say it will be 300-500 to fix. So he buys a new one, gives me the old one for "parts"

The mower is in good shape. I cleaned out a years worth of sitting Idle and re-assembled it. Here's the weird part. When I first got it back I hooked it to the car battery and turned it over. I got spark. I had spark everytime I tried it while I was cleaning it up. Put in fresh gas, hit it with some ether and fired it up....it popped once or twice (more like coughed) and now I am back at square one...no spark, no matter what i fool with.

Any suggestions? I think I am down to either coil issues, or possible need a new "magnetron" ignition?

I can provide more info if needed. I am quite a decent mechanic, but this one has me a little puzzled.


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08-26-05, 08:31 PM   #2  
Hello Dave!

The coil/armature is probably whats wrong here, but do this test if you haven't already: Unplug the kill wire from the coil and check for spark then. If still no spark, replace the coil. It comes with the magnetron ignition module built in nowadays.

"Who is John Galt?" - Ayn Rand (Atlas Shrugged)

God bless!

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