NGK Spark plugs
- Thread starter Gerryb
- Start date
wjbertrand
Ventura Highway
I can't find anything specifically on non-iridium, standard, counterfeit NGK plugs. Maybe they are too inexpensive already for the counterfeiters to bother with? I'm looking at the CPR8EB-9 plugs that fit my Super Tenere. I got these at Rock Auto and so far, looking at various videos and websites, they seem perfectly legitimate. I have a set of the same plugs from the same supplier in my bike now for the last 25,000+ miles with no apparent issues.
Andrew Shadow
Site Supporter
Spark pr0n
- Joined
- Oct 1, 2018
- Messages
- 99
- Age
- 70
- Location
- Titanic America, Banana Republic
- Bike
- 2022 BMW RT 1250
I'm curious, If the factory recommended CR7EH-9 (NGK) is too hot, will that have any effect on the "heat issue" some of us seen to experience? Will running the CR9 allow the bike to run any cooler? I notice the bike throws out more heat during spirited riding.
The "colder" plug does not get up to operating temperature as fast and wicks more heat to the head more slowly. The temp range is managed by the amount of area exposed to combustion gasses and, presumably, different insulator characteristics. NGK recommends hotter plugs for "light duty" vehicles and colder plugs for "performance vehicles."
Importance of Heat Range – NGK
The heat rating is a measure of the amount of heat dissipation.The heat range of a spark plug is the range in which the plug works well thermally. The heat rating of each NGK spark plug is.
www.ngkntk.in
A heat rating that is too low is potentially dangerous to your motor. One that is too high may lead to the inconvenience of a fouled plug. I doubt Honda screwed it up its recommendations for spark plugs.
So they were fake and you caught the dealer rep in a lie?
interceptor44
1991 ST1100
Got these in July...bike running good, fixed my hesitation problem. Did not bother to look as I never heard of
the fake plugs. Should I pop one out to check? Guessing this is not a pic of mine......he had a bunch for sale.
Got them on ebay.
Seller information
boatingindustrysurplus (3244 )
99.5% Positive feedback
He has sold 24 sets and I don't see any negative feedback on them so far. Paid 32.00
the fake plugs. Should I pop one out to check? Guessing this is not a pic of mine......he had a bunch for sale.
Got them on ebay.
Seller information
boatingindustrysurplus (3244 )
99.5% Positive feedback
He has sold 24 sets and I don't see any negative feedback on them so far. Paid 32.00
Attachments
What came out of my machine were 7s. The rear heads run hotter, which is common. 7s are clearly not "way too hot" even for central United States hot summers. However, I think the 8s might be better and they'll certainly be fine since the motor runs lean anyway. The only visual difference is the 8s are about 1 thread shorter, so they are less exposed to combustion chamber heat.
wjbertrand
Ventura Highway
If one is upgrading to iridium, those plugs tend to have a wider heat range than standard plugs so they tend to be available in fewer individual heat ranges. I ran the 8 iridium in my ST under all riding conditions and they always looked perfect.
Regarding spark plug heat range and engine running temperature, these are separate questions. The hotter or colder plug refers to the heat retained at the plug tip between combustion cycles. Colder plugs have a shorter heat path to the head and bleed the heat off more quickly whereas the hotter plug has a longer heat path so thereby retain more heat between combustion cycles. Changing spark plug heat range will have no effect on engine running temperature, unless you go way too far toward a hotter plug to the point where you are getting preignition.
Regarding spark plug heat range and engine running temperature, these are separate questions. The hotter or colder plug refers to the heat retained at the plug tip between combustion cycles. Colder plugs have a shorter heat path to the head and bleed the heat off more quickly whereas the hotter plug has a longer heat path so thereby retain more heat between combustion cycles. Changing spark plug heat range will have no effect on engine running temperature, unless you go way too far toward a hotter plug to the point where you are getting preignition.
Last edited:
Just as a follow up on the NGK plugs I ordered from Fortnine Canada, I took a detailed look at them using a jeweller’s loop and compared to the fake plug references on the NGK website. It looks pretty conclusively to me that these plugs are genuine as they have none of the hallmarks of the fake plugs.
I had previously ordered and installed NGK Iridium plugs from Fortnine for my Suzuki V-strom (before being aware of the fakes issue) and have run them for about 10,000 km without issue, so I would put Fortnine in the “safe” retailer category.
I had previously ordered and installed NGK Iridium plugs from Fortnine for my Suzuki V-strom (before being aware of the fakes issue) and have run them for about 10,000 km without issue, so I would put Fortnine in the “safe” retailer category.
Kevcules
Site Supporter
Ive also used FortNine many times for NGK plugs without issues. I contacted them to inquire about possible fake plugs. They assured me that they buy from the manufacturer.
Last edited:
- Joined
- Oct 1, 2018
- Messages
- 99
- Age
- 70
- Location
- Titanic America, Banana Republic
- Bike
- 2022 BMW RT 1250
Ordered U24FER9 Denso plugs and got NGK CR9EH as an equivalent instead. It was my understanding that the U24 Denso was more like the NGK CR8EH vice the CR9. Any thoughts on the CR9's for the ST1300? Safe to install or should I just return for actual Denso's or CR8's? The NGKs I received do not look counterfeit based upon the comparison pics I've seen online. Thanks.
Can you please explain this? I don't understand. (I do get how plugs have different heat ranges and the construction techniques to yield them.)