Briggs 402437 NO Spark
#1
10-10-09, 02:38 PM
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Briggs 402437 NO Spark
I have a briggs 402437 and i have replaced the coil and the flywheel key and cleaned everything up and still no spark. I am very lost any one have any Ideas.
#2
10-10-09, 03:26 PM
Did you set the coil air gap?
My other guess is a safety switch is causing the coil to be grounded preventing it from firing. Post the model and serial number of your mower and the engines type number if you need further help.
You can disconnect the ground wire from the coil and see if the engine starts. Disconnecting the ground wire takes the safety switches out of the system and the ignition switch OFF function is disabled.
Warning: If the engine starts the ignition switch WILL NOT shut the engine off. You will need to choke it to flood the engine or pull the spark plug wires.
My other guess is a safety switch is causing the coil to be grounded preventing it from firing. Post the model and serial number of your mower and the engines type number if you need further help.
You can disconnect the ground wire from the coil and see if the engine starts. Disconnecting the ground wire takes the safety switches out of the system and the ignition switch OFF function is disabled.
Warning: If the engine starts the ignition switch WILL NOT shut the engine off. You will need to choke it to flood the engine or pull the spark plug wires.
#3
10-12-09, 04:47 AM
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#4
10-12-09, 05:27 AM
The coil (armature) air gap of 0.020 inch is too large. Hopefully this is your problem.
The engine originally had breaker point ignition. If it has not been converted to electronic ignition (Magnetron) the points could be the problem.
Armature Air Gap
Magnetron Ignition 0.008 – 0.012 inch
Breaker Point Ignition 0.010 – 0.014 inch
Point Gap 0.020 inch
The engine originally had breaker point ignition. If it has not been converted to electronic ignition (Magnetron) the points could be the problem.
Armature Air Gap
Magnetron Ignition 0.008 – 0.012 inch
Breaker Point Ignition 0.010 – 0.014 inch
Point Gap 0.020 inch
#5
10-12-09, 06:13 AM
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ok it is magnatron and i brought the gap to .08 and still no spark the flywheel and magnetic. at a loss
#6
10-12-09, 08:15 AM
Are the flywheel magnets intact and have strong magnetic force?
Is the coil installed correctly, not upside down? The coil should be marked for which side goes up.
You say the coil is a Magnetron. Did you convert from points system to Magnetron?
Was the new coil you installed a part number 394891?
Do you have two or more wires on the coil? One or two wires may go to frame and another to the ignition switch. I am trying to do this from memory so I may be off. Does the wire you disconnected from the coil go to ignition switch?
Is the coil installed correctly, not upside down? The coil should be marked for which side goes up.
You say the coil is a Magnetron. Did you convert from points system to Magnetron?
Was the new coil you installed a part number 394891?
Do you have two or more wires on the coil? One or two wires may go to frame and another to the ignition switch. I am trying to do this from memory so I may be off. Does the wire you disconnected from the coil go to ignition switch?
#7
10-12-09, 08:45 AM
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fly wheel magnets are good and i put in a oregon 33-345 magneto coil replaces briggs 394891.
I did not convert it someone else did before me but what i took out looks just like what i put in .
yes the coil is installed correct.
I did not convert it someone else did before me but what i took out looks just like what i put in .
yes the coil is installed correct.
#8
10-12-09, 09:59 AM
If you have done everything correct then the coil is defective.
The coil you installed is an Oregon aftermarket coil. Last year I had a rash of bad aftermarket coils I purchased from a different aftermarket company. All of the ones I had problems with were manufactured in Brazil. I only install OEM now.
The coil you installed is an Oregon aftermarket coil. Last year I had a rash of bad aftermarket coils I purchased from a different aftermarket company. All of the ones I had problems with were manufactured in Brazil. I only install OEM now.
#9
10-12-09, 10:32 AM
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#10
10-12-09, 01:18 PM
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ok double check and still nothing, i took the coil back out and just for giggles i flipped it over and it worked. there was no markings for up or down but anyway it works. Thanks Airman you were a great help.
