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#1

8

87superseven

2018 Toro With B&S motor. Quit as though you shut if off with a key as opposed to sputtering to a stop like lack of fuel. I have checked for fuel(good), replaced the plug, replaced the CDI with a new B&S unit and the small wire that runs to it the ground(?) I still have no spark. Disconnected the "ground(?) to the CDI, still no spark, checked the air gap(.006). I'm pretty good with engines but this one has me stopped cold. Seems simple but....
This was a two pull to start motor until now. Now it's no start period


#2

R

Rivets

First, check to see if you may have installed the coil upside down. Second, set the air gap at .010”. Check for spark with kill wire off, if spark attach kill wire and test again. Report back findings, with unit model and serial numbers.


#3

A

Auto Doc's

If the coil was bought through Amazon, it is likely a dud. Aftermarket parts are a crapshoot these days.

Need to know the numbers on the engine valve cover or etched into the side of the main block.


#4

8

87superseven

Rivets said:
First, check to see if you may have installed the coil upside down. Second, set the air gap at .010”. Check for spark with kill wire off, if spark attach kill wire and test again. Report back findings, with unit model and serial numbers.
Click to expand...
Coil is installed correctly. Will reset air gap to .010. What effect does the air gap have on the CDI working(or not). Have disconnected the kill wire to effect.


#5

8

87superseven

Auto Doc's said:
If the coil was bought through Amazon, it is likely a dud. Aftermarket parts are a crapshoot these days.

Need to know the numbers on the engine valve cover or etched into the side of the main block.
Click to expand...


#6

8

87superseven

no numbers on the valve cover. "tag" on the engine states it's engine 104m020131f1, serial 1903144832936. Is there a way to test a CDI unit?. The part was bought through Amazon, but came in what appears to be a legit B&S box, but who knows. Do you have a site that you purchase B&S parts from that work?


#7

A

Auto Doc's

CDI unit? That is a fancy technical term for ignition coil.

A simple test to check for ignition fire is to remove the plug and ground the metal end against the block, then have a helper slowly pull the start rope while you watch for spark. If you have a bright blue spark, the coil is working.

An adjustable spark tester also works very well. The flash bulb type ignition testers are a gimmick and unreliable.

Was to coil installed upside down? It is a simple mistake that will still show spark, but it is literally out of time with the piston and valve operations. Also, aftermarket coils have been known to be internally wound backwards before and that will keep a person guessing.

Was anything struck on the ground when the mower suddenly stopped? If so, the flywheel key could be sheared and that will throw off spark timing.

Check this parts link out:

www.partstree.com

PartsTree - Home of OEM Parts for Outdoor Power Equipment

Parts lookup and repair parts diagrams for outdoor equipment like Toro mowers, Cub Cadet tractors, Husqvarna chainsaws, Echo trimmers, Briggs engines, etc.
www.partstree.com www.partstree.com


#8

8

87superseven

Auto Doc's said:
CDI unit? That is a fancy technical term for ignition coil. A simple test to check for ignition fire is to remove the plug and ground the metal end against the block, then have a helper slowly pull the start rope while you watch for spark. If you have a bright blue spark, the coil is working. An adjustable spark tester also works very well. The flash bulb type ignition testers are a gimmick and unreliable. Was to coil installed upside down? It is a simple mistake that will still show spark, but it is literally out of time with the piston and valve operations. Also, aftermarket coils have been known to be internally wound backwards before and that will keep a person guessing. Was anything struck on the ground when the mower suddenly stopped? If so, the flywheel key could be sheared and that will throw off spark timing. Check this parts link out:
www.partstree.com

PartsTree - Home of OEM Parts for Outdoor Power Equipment

Parts lookup and repair parts diagrams for outdoor equipment like Toro mowers, Cub Cadet tractors, Husqvarna chainsaws, Echo trimmers, Briggs engines, etc.
www.partstree.com www.partstree.com
Click to expand...


#9

8

87superseven

Grounded the plug. No spark. disconnected the "kill" wire. No spark. Coil installed correctly. It's marked"out". I don't think you could make the electrical connections if it were installed upside down. Didn't hit anything. Will try and check the crankshaft keyway, it's a long shot but who knows.


#10

ILENGINE

ILENGINE

Auto Doc's said:
CDI unit? That is a fancy technical term for ignition coil.
Click to expand...
Technically it is a CDI. The new style briggs ignition modules are Capacitive Discharge Ignition.


#11

ILENGINE

ILENGINE

87superseven said:
Grounded the plug. No spark. disconnected the "kill" wire. No spark. Coil installed correctly. It's marked"out". I don't think you could make the electrical connections if it were installed upside down. Didn't hit anything. Will try and check the crankshaft keyway, it's a long shot but who knows.
Click to expand...
Sheared flywheel key in this won't prevent spark. Would effect starting and running but will still produce spark.


#12

A

Auto Doc's

87superseven said:
Grounded the plug. No spark. disconnected the "kill" wire. No spark. Coil installed correctly. It's marked"out". I don't think you could make the electrical connections if it were installed upside down. Didn't hit anything. Will try and check the crankshaft keyway, it's a long shot but who knows.
Click to expand...
Even if the key is sheared, it will still spark


#13

A

Auto Doc's

ILENGINE said:
Technically it is a CDI. The new style briggs ignition modules are Capacitive Discharge Ignition.
Click to expand...
Thanks, ILENGINE,

I work in the industry like you do, but many people here don't, so terminology and acronyms can be confusing for them.


#14

ILENGINE

ILENGINE

Auto Doc's said:
Thanks, ILENGINE,

I work in the industry like you do, but many people here don't, so terminology and acronyms can be confusing for them.
Click to expand...
People tend to use coil and ignition module interchangeably but are not the same thing actually


#15

S

slomo

87superseven said:
Coil is installed correctly.
Click to expand...
Post up pictures here of the coil and kill wire which is a small black wire.

Chances are could be a Chinese clone coil or simply defective.

If you ground that small gauge wire, you get no spark.


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