No spark from the plug but strong spark from the coil.

[Hottech]

if these are plugs that came from an online source, you may have a whole run that are counterfeit or defective.

Plug works fine in my other mower
New coil arrives on Monday.

 

[sgkent]

I would clean the grounds on the old coil, and verify it has a good ground. Don't overtighten those bolts. Sometimes rust and corrosion can cause the ground side of the coil to fail. It grounds where it touches the engine, and thru the bolts.

 

[slomo]

FYI

Recommend buying non-resistor plugs from a local auto parts store.

Stay off scamazon and fleabay for plugs. They are highly pirated and are junk from online sites.

 

[Hottech]

Bought a new coil and engine started right up. Guess that the original was just too weak but my tester showed a strong spark. Can no longer trust my tester.

 

[Mark H_NO]

Thanks for letting us know. The light bulb testers don't require much to set them off. It's a clue, when it doesn't light up when the tester is connected to plug wire then spark plug(installed or grounded, but does if connected to wire and ground. Wired through the plug, it has to actually make a spark to light the bulb.

 

[slomo]

Here, $1.39 to your door. Best tool you can get especially for the money.

https://www.ebay.com/itm/136815746178?_skw=open+gap+spark+tester&itmmeta=01KREN514F1AA7FWYYYC03BQWN&hash=item1fdada9c82:g:WMsAAOSwm4VnVr~n&itmprp=enc%3AAQALAAAA8GfYFPkwiKCW4ZNSs2u11xDC2emQtiGVwJWR0blzKpXukWUYyXVIkhXmkq%2FmSCp8%2BovlnLvRGD1qH9cJnMdMBzqzxkMKspIQkcU0jHncKlgCvTSeDVkpib6D3Co%2BX9Je2UyH9vP%2Bx1jMm08OPmRYRBHbBgc55%2FASlZKQocIyRojqb%2F7IPclp3KEHqwgUXvmTOI34OvTfr7CkzOmoak8GIGf1XBXrVwlEx12qt8M%2Bq7lWa2jD5LVQ%2BAWsO5nwtCtgsEykXw%2FDgpNViY374sd3rBWnT%2FsCbE94UoDpGT4hToi0DvZMJaPTXVjsZQbh3cBkAg%3D%3D%7Ctkp%3ABk9SR7aSlNXDZw

 

[slomo]

Toss your bulb type spark checker in the trash can.

 

[RevB]

Briggs and Stratton single cylinder v tech has a strong spark from the coil utilizing a tester but no spark from the plug. Replaced the plug but still no spark. Asked a mechanic and he said that he would first just replace the coil. Ordered a new coil and hope that it will fix the problem but not too confident since the original coil has a very strong spark. Any suggestions would be appreciated

Briggs and Stratton single cylinder v tech has a strong spark from the coil utilizing a tester but no spark from the plug. Replaced the plug but still no spark. Asked a mechanic and he said that he would first just replace the coil. Ordered a new coil and hope that it will fix the problem but not too confident since the original coil has a very strong spark. Any suggestions would be appreciated.

How old is this coil? If it has switching transistors they can become weak after years of use. You should see a bright blue spark and audibly hear the snap from the spark.

 

[jviews12]

test the tester on another device. always verify your test instruments. good luck