B&S Vangard wont shut off


  #1  
Old 04-02-24, 08:47 AM
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B&S Vangard wont shut off

Hi All, I have replaced the diodes with new ones , even grounding them directly to the block the engine will not shut down, only after the fuel solenoid is closed will it then shut off, what am I missing?
Geo🇺🇸
 
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Old 04-02-24, 09:35 AM
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is the diodes installed backwards?
 
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Old 04-02-24, 09:45 AM
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It is my understanding the diodes on a twin cylinder ignition circuit electrically isolate each ignition coil from the other because coil primaries are connected to same OFF terminal on ignition switch. Why did you change them? Did you install them with the correct polarity?
 
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Old 04-02-24, 10:54 AM
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The way the diodes are set up there is really only one they could be installed, long lead to the coil farthest away from the ground terminal.
Geo
 
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Old 04-02-24, 01:38 PM
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Is the band on the diode at the ground end of the orientation? Does grounding the wire above the diode shut off the coil?
 
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Old 04-02-24, 02:12 PM
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Cheese, I’ll check the diode markers, but it’s a new factory assembly, although it’s possible. What do you mean above the diode, directly to the coil terminal ?
Geo🇺🇸
 
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Old 04-02-24, 05:14 PM
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Right, ground it at the coil instead of after the diode.
 
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Old 04-02-24, 07:35 PM
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Grounding one will kill one cylinder, should I do both at the same time?
Geo🇺🇸
 
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Old 04-02-24, 08:10 PM
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If you can ground it at the terminal and it kills it but grounding it after the diode doesn't then the diode is bad or reversed or not connected to the wiring.
 
  #10  
Old 04-13-24, 09:29 AM
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Update

After building my own string of diodes and the circuit worked as required, I double checked the factory (new ) string only to find that the first diode after the ground connection was connected backwards, the motor runs fine but seems to pop a bit, any thought, It is running with out mufflers as we are not sure what that configuration may be.
Geo🇺🇸
 
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Old 04-13-24, 10:14 AM
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If it's running well except for a little popping, I'd put a muffler on it and run it. But if it's running rough, isolate the problem by pulling plug wires. It could be bout anything - plugs, wires, carb adjustment, valves, etc.
 
  #12  
Old 04-14-24, 10:30 AM
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Running without exhaust can cause popping.
 
 

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