Help, No Spark

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  #1  
Old 03-03-06, 11:05 AM
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Angry Help, No Spark

Ok its a 12.5 hp briggs verticle shaft engine. I was told it ran fine when I got it so I was trying to get it to run last week and no spark. I replaced the coil with a brand new one and still no spark. The little wire from the coil isnt touching ground either. I have it bolted down about as close to the flywheel as I can get it without touching. The magnent will pick up my screw driver so I know its strong. Im getting very aggravated with it, does anyone know what else could cause this??? Could the starter not be spinning it fast enough? I would really like to hear anyones thoughts on this, I really need to get this running.

Thanks alot for everyones help.
 
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  #2  
Old 03-03-06, 02:25 PM
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The starter certainly must have enough power to get it to spin at least 350 rpm but 500 is better. A typical electric starter in good condition will spin about 7-800 rpm and a typical pull starter will spin at about 4-500 rpm. Does yours have pull-start option? If not and you aren't sure if the E-start is spinning fast enough, try using a jumper battery. If you believe it is, in fact, spinning well enough, you need to pull the kill wire off - AT THE COIL, and then check for spark. This eliminates the possibility of a bare spot in the ground (kill) wire and thereby grounding out. And be sure to set the coil to magnet clearance at .010".
 
  #3  
Old 03-03-06, 07:05 PM
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The kill wire is off and will try to check rpm tomarrow. I dont have a pull start, wish I did. Also is setting the coil .010 that important? On my 3.5hp I just put it close and have no problems.
 
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Old 03-03-06, 11:56 PM
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If you don't have feeler guages to set the gap, just use a business card. It's close enough to work well. Are you sure the coil isn't on upside down?
 
  #5  
Old 03-04-06, 06:30 AM
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Originally Posted by cheese
If you don't have feeler guages to set the gap, just use a business card. It's close enough to work well. Are you sure the coil isn't on upside down?
Im not that stupid, lol its on there right. It even says this side up, Im goint to play with it some more today so wish me luck.
 
  #6  
Old 03-04-06, 10:43 AM
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I got spark today, the new coil gave me a few but when I put the old coil back on it, it sparked like a beast. When I put the plug back in the engine it had compression and the starter didnt have enough power to spin it, I guess its time for a new starter. I put two 50 amp bettery chargers on the starter to really spin it.
 
  #7  
Old 03-04-06, 03:09 PM
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Originally Posted by michaeljp86
I put two 50 amp bettery chargers on the starter to really spin it.
I dunno if its the starter, because on my briggs motor, I hooked up the battery charger right to the starter solenoid, and it didn't have enough power to turn over, but when I hook up a fully charged battery to the starter solenoid, it worked like new. I believe it has something with the cranking amps. If you got a fully charged battery, take the jumper cables, hook up the negative (black) to the negative connection on the equipment to ground, and the positive(red) right to the starter solenoid. see if it spins now. if you have a fuel leak, this really isn't that safe.
 
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Old 03-04-06, 07:26 PM
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I will try that tomarrow, I had 100 amps though but I should giv it a stab before buying a new starter like I did the coil. Thanks for everyones help so far, hopefully I get it going tomarrow.
 
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Old 03-04-06, 08:54 PM
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how fast did it spin with 100 amps?
 
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Old 03-05-06, 08:03 AM
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without the spark plug probably 300, It had a good spark. The new coil had a very small spark and only every once in a while. With the spark plug in it spins fine till the compression stroke then it stops, doesnt have enough power to run it past. I have a battery on the charger so Ill try it with the battery later and see how that goes.
 
  #11  
Old 03-05-06, 06:49 PM
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Well today I stole the battery out of the lawn mower and charged it for a while. With this very old battery and the 100 amps of the chargers It spun it good. Finaly I got it to fire on starting fluid an I rigged up a pop botle fuel tank and it ran good in the 30 degrees. Thanks for everyones help Im glad Its going, now I can get on with my life.
 
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