User Panel
User Panel
User Panel
|
Posted: 2/9/2020 5:47:55 PM EDT
[#1]
It happens, Bosch plugs are famous for crap like that.
|
|
|
|
Posted: 2/9/2020 5:53:53 PM EDT
[#2]
Not really common but maybe the plug was dropped at some point before you installed it.
|
|
|
|
Posted: 2/9/2020 6:18:54 PM EDT
[#3]
NGK’s were always solid for me. Every part and piece on this planet does have a failure rate though.
|
|
|
|
Posted: 2/9/2020 6:53:39 PM EDT
[#4]
Quote HistoryQuoted:
It happens, Bosch plugs are famous for crap like that. |
|
|
|
Posted: 2/9/2020 9:37:56 PM EDT
[#5]
I've seen spark plugs be bad right out of the box. Usually a cracked insulator. It's not very common but it does happen.
|
|
|
|
Posted: 2/9/2020 9:39:27 PM EDT
[#6]
Sounds like you found the 1 in 1,000,000 bad part that isn't worth the factory testing for:)
|
|
|
|
Posted: 2/9/2020 11:37:31 PM EDT
[#7]
Quote HistoryQuoted:
Sounds like you found the 1 in 1,000,000 bad part that isn't worth the factory testing for:) 
oh wait...that's like 1/1000000 DMPO |
|
|
|
Posted: 2/10/2020 8:35:57 AM EDT
[#8]
Rare but it does happen. Contact the manufacturer.
|
|
|
|
Posted: 2/10/2020 9:08:27 AM EDT
[#9]
Quote HistoryQuoted:
Rare but it does happen. Contact the manufacturer. I put a different one in, and it works great. Something internally must have shorted out. The weird part was that it worked great for about an hours worth of riding....then it just died, like you pressed the kill switch. After that...no spark at all. I thought it was the coil or stator. But nope, I put an old plug back in and grounded to to the motor....ran the kickstarter, and the plug started sparking. |
|
|
|
Posted: 2/10/2020 10:40:54 AM EDT
[#10]
Quote HistoryQuoted: Not sure it's worth the trouble for a $7 spark plug. I put a different one in, and it works great. Something internally must have shorted out. The weird part was that it worked great for about an hours worth of riding....then it just died, like you pressed the kill switch. After that...no spark at all. I thought it was the coil or stator. But nope, I put an old plug back in and grounded to to the motor....ran the kickstarter, and the plug started sparking. |
|
|
|
Posted: 2/10/2020 11:22:24 AM EDT
[#11]
Quote HistoryQuoted: Cracked center electrode insulator |
|
|
|
Posted: 2/10/2020 1:45:21 PM EDT
[#12]
Quote HistoryQuoted:
6 Sigma...
oh wait...that's like 1/1000000 DMPO Quote HistoryQuoted:
Quoted:
Sounds like you found the 1 in 1,000,000 bad part that isn't worth the factory testing for:)
oh wait...that's like 1/1000000 DMPO |
|
|
|
Posted: 2/10/2020 1:46:01 PM EDT
[#13]
Quote HistoryQuoted:
Is that something you can see with the naked eye, or is it internal? Quote HistoryQuoted:
Quoted: Cracked center electrode insulator When you hold it against the engine and crank it, you might see it sparking up inside the plug. Usually faint so it’s very hard see. |
|
|
|
Posted: 2/10/2020 4:13:45 PM EDT
[#14]
Any chance it was a counterfeit Chinese knock off?
|
|
|
|
Posted: 2/10/2020 4:45:46 PM EDT
[#15]
Like others said it does happen sometimes, usually from cracked porcelain from being dropped or wrench slipping when installing.
|
|
|
|
Posted: 2/10/2020 4:59:09 PM EDT
[#16]
When I am on a two stroke on the trails I always have an extra plug with me just in case.
|
|
|
|
Posted: 2/10/2020 5:09:36 PM EDT
[#17]
Can you measure resistance from tip to electrode and electrode to threads?
I used NGK and always had to carry around a few plugs after doing a fresh top end on my YZ. It didn't take very much to cause them to stop working. |
|
|
|
Posted: 2/10/2020 9:38:49 PM EDT
[#18]
I like to carry spare spark plugs on my ATVs and RZR just in case. Haven’t needed one so far but it’s a cheap backup
|
|
|
|
Posted: 2/13/2020 8:32:06 PM EDT
[#19]
Where was your spare spark plug?
|
|
|
|
Posted: 2/13/2020 9:21:30 PM EDT
[#20]
Quote HistoryQuoted:
Not usually visible. When you hold it against the engine and crank it, you might see it sparking up inside the plug. Usually faint so it’s very hard see. Quote HistoryQuoted:
Quoted:
Quoted: Cracked center electrode insulator When you hold it against the engine and crank it, you might see it sparking up inside the plug. Usually faint so it’s very hard see. |
|
|
|
Posted: 2/15/2020 10:37:40 AM EDT
[#21]
I have had them be bad right out of the box. Back in my day when real men rode 2 strokes you had to make sure you either rode it like you stole it or carry a few extra plugs with you at all times.
|
|
|
|
Posted: 2/16/2020 9:33:01 PM EDT
[#22]
Didn't you post this on TT also?
Just bad luck, always bring a spare at least in the truck, but on bike is better. |
|
|
|
Posted: 2/17/2020 10:40:36 AM EDT
[#23]
Quote HistoryQuoted:
Not sure it's worth the trouble for a $7 spark plug. I put a different one in, and it works great. Something internally must have shorted out. The weird part was that it worked great for about an hours worth of riding....then it just died, like you pressed the kill switch. After that...no spark at all. I thought it was the coil or stator. But nope, I put an old plug back in and grounded to to the motor....ran the kickstarter, and the plug started sparking. Quote HistoryQuoted:
Quoted:
Rare but it does happen. Contact the manufacturer. I put a different one in, and it works great. Something internally must have shorted out. The weird part was that it worked great for about an hours worth of riding....then it just died, like you pressed the kill switch. After that...no spark at all. I thought it was the coil or stator. But nope, I put an old plug back in and grounded to to the motor....ran the kickstarter, and the plug started sparking. Throw a spare in your pack. |
|
|
|
Posted: 2/17/2020 2:59:21 PM EDT
[#24]
Another suggestion is to run a plug for awhile and then replace it but keep your slightly used plug as a spare. You know it works.
Spark plugs are made pretty cheaply so bad ones aren't unusual. |
|
|
|
Posted: 2/17/2020 3:31:28 PM EDT
[#25]
I was a bike mechanic for almost 20 years and I've installed literally thousands upon thousands of spark plugs. Very few have failed right out of the box like that but it has happened. In the aircraft industry, if you drop a spark plug, it's toast.
|
|
|
|
Posted: 2/20/2020 12:29:15 AM EDT
[#26]
Had that happen to me before, had a cracked insulator. Was on a four wheeler not a dirt bike. Put a new plug in and ran fine.
|
|
|
|
Posted: 2/21/2020 10:47:57 PM EDT
[#27]
Did you buy the plug on Amazon/Ebay?
|
|
|
|
Posted: 2/25/2020 2:16:03 PM EDT
[#28]
Quote HistoryQuoted:
I was a bike mechanic for almost 20 years and I've installed literally thousands upon thousands of spark plugs. Very few have failed right out of the box like that but it has happened. In the aircraft industry, if you drop a spark plug, it's toast. Good news...put a new plug in, and the bike is running great again 
|
|
|
|
Posted: 2/25/2020 2:44:13 PM EDT
[#29]
Not really all that uncommon. It's happened to me a time or two. Plug probably got dropped at some point and got cracked
|
|
|
Win a FREE Membership!
Sign up for the ARFCOM weekly newsletter and be entered to win a free ARFCOM membership. One new winner* is announced every week!
You will receive an email every Friday morning featuring the latest chatter from the hottest topics, breaking news surrounding legislation, as well as exclusive deals only available to ARFCOM email subscribers.
AR15.COM is the world's largest firearm community and is a gathering place for firearm enthusiasts of all types.
From hunters and military members, to competition shooters and general firearm enthusiasts, we welcome anyone who values and respects the way of the firearm.
Subscribe to our monthly Newsletter to receive firearm news, product discounts from your favorite Industry Partners, and more.
Copyright © 1996-2024 AR15.COM LLC. All Rights Reserved.
Any use of this content without express written consent is prohibited.
AR15.Com reserves the right to overwrite or replace any affiliate, commercial, or monetizable links, posted by users, with our own.
