Disclaimer: All information in this video is based off of Jeff's and Slavens Racing's experience and testing and meant to serve as a recommendation. NGK Spark Plugs: slavensracing....
Good information. Thank you. My TX300 fouled plugs like candy before the latest mapping update released a couple months ago. It’s better, but still super rich. I’ll give one of these a try.
Have a 21 300 XC-W and used to foul plugs when using regular BR7 or 8’s. Ever since switching to the BR7IEX well over a year ago now I have yet to foul a plug.
Adding to this excellent spark plug recommendation , when I was looking for the BR7eix, NGK Part No. 5044 shows up and the pics on NAPA and Amazon shows the BR7eix but with a much larger electrode. When I go straight to NGK and cross reference the iridium plug to the 250xc part number 6664 is presented. Just an observation that the BR7EIX has multiple part numbers, well at least two.
Haven't fouled a plug since 2003, and that was on a too richly jetted Kawasaki KDX200 I had just recently bored to 240cc. I ride a lot, mostly at high altitude (CO). I suspect anyone who is fouling plugs has jetting issues, or other engine issues. My bikes? '07 KTM 250XC, '12 Husaberg TE300, '13 KTM 250 XC-W. I also had an '02 KTM 200 EXC. I've never fouled a plug in any of those bikes. They all have 100's of hours on them. I ride with quite a few riders on the TPI and now TBI bikes. None have ever mentioned fouling a plug. All, to my knowledge, run the stock plugs. Oh, and all my bikes run on Maxima Super-M at 45:1. I run stock BR7ES or BR8ES plugs, depending on the model.
I’ve fouled one plug in 12yrs, on my trials bike, after I forgot to turn the choke off. I have always for years for the same reason run iridium plugs. Yet people say they’ve fouled more iridium plugs than anything… 🤣 I’d love to see their jetting specs. I’ve got a 23 300SX and I think people aren’t following the start up procedure. If mine doesn’t start on the button, I push the cold knob in and try again. Let it idle for a bit till ti heats up, clear it out then kill it. As I’ve always done. Heat range - assume the 300XC is mapped much more similar to the SX than the EXC. I used to run a 7 or 8 depending on EXC or SXS CDI fitted to my old bike. One definitely too hot for the other and vice versa. Interesting to know which map the 300XC guys are fouling plugs on… I’d wager that they’re doing EXC type riding on Map 1.
I just fouled my 300exc riding in tight bush with an Iridium. I will be switching back to the standard plug. Which has never given trouble. My friend worked at NGK as an engineer for 15years and once he explained the technical differences then you realise iridium is not for every engine.
Wish I'd watched thus last week Had the coldest day this year and she fouled up about 5 min after starting it... Will not let it sit to warm up again!!
Did not resolve my plug fouling by using the BR7eix. Doesn’t matter which plug is in it. After a hard ride and I get on a wide connecting trail or road to the next trail head it foul’s after it cools down from more airflow due to faster riding speeds. Even after I wrang it neck in 5th and 6th gear it fouls when I get to a mid rpm cruising speed either back to camp or to the next trail. I’ll lug in tight PNW single track, it doesn’t load up nor does it feel like I need to open it up and even when I do it’s clean and crisp…..until the end of a section and I pick up speed. As if it cools down quicker than the computer can lean it out. Plugs are dark black and soaked in fuel when I pull them out. If I run map 1 for a long period I can usually save it when it sound loaded but if map 2 is used it just instantly fouls without any signs of loading, no spuddering.
2023 ktm 125sx fouls everytime i take it out for the day on manufacture recommended NGK BR10 ECMVX, my style of riding probably doesn’t help but I’ve tried a couple different plugs, some last a little longer than others but still foul in a day, so looks like I’ll be trying this one thanks for the info
Same here, i have a 23 250sx and have been through 3 plugs in the first 4hrs of owning the bike. Wondering if theres an issue with the mapping. Any recommendations for replacement plug?
@@neil.p9868Im now using BR8EIX as slavens suggested me to and up to now its been all good, but that said mine 125 where yur 250. Maybe try a heat range or 2 down from what manufacturer states in manual, they state BR10 for 125 and now im using BR8 so i gone 2 heat ranges down
Thanks Jeff! Very helpful! I have some iridium BR8EIX plugs left over from an old bike? I know it won't run as hot as the 7's, but would it be better than the stock plug for my 23 KTM 300SX?
Great video and explanation on the plugs. I just fouled the plug on my 23 KTM 300xc at 7 hrs. Which plug do you recommend using on this bike? The BR7EIX looks longer on the threads. Bike has stock head.
are you guys seeing issues with the 2024s? My son's has a BR10 and has not fouled a plug yet, but we dont idle other than warming up, and he's screaming other wise. I have always heard a hotter plug could cause damage - could you elaborate on that?
Hello Gduck: Sorry, I'm busy riding and don't have time to write a book about spark plugs, but I might make a video in the future. You did not include your son's bike info but it must be a small bore if you're using a 10 plug. 10s are extremely cold and originally intended for sustained high RPMs in road racing. I would never use a 10 for offroad use. 9 is as cold as I would go and 8s make more sense for 99% of applications.
23' 250xc, i've got the latest map from KTM but my past coupe of rides I had some minor bogging issues in the mid to top end. I run Motorex at 60:1 with Chevron 94 Octane. Got 14 hrs on the bike and I ride a fair bit of moto so i'm on it fairly hard, hoping switching to a iridium br7 cleans things up? Don't want a bog on the face of a jump!
Yes, the dealer recalibrated the power valve and TP sensor. Haven't ridden it yet but i'm sure that was the issue. He pulled the expansion chamber and said the piston and cylinder looked good! @@SpeedDemonExpress
I had an ngk zgr7gi-13g iridium spark plug installed in my engine from the factory, on which the motorcycle works very well and was additionally supplied with br7es. Tell me, does it make sense to change iridium to regular? what will be the difference when replacing?
NGK calls that plug "NGK ZGR7GI-13G NGK Laser Iridium Spark Plug" this has platium on the electrode and the ground side so both coated with platium the other one only has it on the electrode. It ZGT7Gi is also rated to 100k miles and the other is 50k. So, either will work just fine. there is a price difference. Your choice.
Hi. Can i have your opinion please about my decision? On my 21 ktm exc 250 tpi ,i chose to run it with br7eix instead of br7es for enduro riding of course. Do you think there are any disadvantages to this?
Just bought my first dirt bike 2023 ktm 125 xc and 6.5 hours in fouled my spark plug what would you recommend to replace the br10ec that came stock with the bike
Hello: A 10 heat range is very cold and typically used only for road racing. For trail riding use a NGK BR7eix, hard core racing change to an 8, slavensracing.com/shop/spark-plugs-ktm-husaberg-ngk/ .
Have heard about people running the 7 series plug with VP T2 fuel which is 40:1. Any experience with the 23 300/250 XC with that vs the spec 60:1 ratio?
So would you say the best option for my new 300sx that I trail ride mainly would be a br8eix or a br7eix ? Currently running the oem br8es, thanks in advance .
Idk why you are downplaying the quality of the stock plug. BR8ES is a copper core plug. Plenty of engines use that, not just lawn mowers. Iridium plugs are for lasting longer because they resist ark erosion better than copper. For a 2 stroke where we replace plugs every top end or sooner, the copper plug makes sense for the money. The tip being thinner does not mean less electrical resistance. The material used determines electrical resistance.
@@slaverace1I’ve always felt the finer tipped iridium plug was less prone to fouling as well simply because there is less surface area for carbon or even fuel to hang onto 🤷 my friends 23 TBI eats br8 ngk’s like candy. And he’s an A level national enduro rider. I’m trying to find answers to help him figure this out. Sounds like this style hotter plug is a good first place to start.
I contacted NGK and they agree that the BR7EIX is a valid replacement for the recommended iridium plug. However I notice the BR7EIX does not have the extended tip. In fact it looks almost 1/4 inch d shorter than the factory plug on the TPI. So you're staying that has no effect on ignition or fouling?
@@kcomst Hello: The KTM 300 has come with a BR7 series plug for 20+ years and is still the correct heat range for most applications. If you are experiencing fouling issues, you can use a BRP (P is for projected tip) but the better solution is to correct the fueling issue that causes plugs to foul.
My brand new 2023 250sx runs rich with the stock BR8ES, after each drive my plug is black and happened to fouled before during a long ride.. what should i do?
Hello: Your new bike runs rich because the ECU mapping is rich. The spark plug has nothing to do with richness. No matter what heat range plug you use, the rich mapping remains a constant. However, you can go to a hotter and better quality plug to reduce the chance of fowling. I recommend the NGK BR7eix, slavensracing.com/shop/spark-plugs-ktm-husaberg-ngk/
@@slaverace1 is there anyway to change that ECU mapping that you’re talking about? When i brought the bike to the dealership they checked everything and said it was fine but i don’t think they are very good mechanics they should’ve tune that ECU leaner… my quick fix solution was getting a hotter plug to burn that oil / gaz quicker but don’t know if it will fix it, i will try that Br7eix !
Are you serious about taking the gas tank off to change the spark plug? Is that what it's coming to these days with the new bikes? Taking the gas tank off, of a two stroke especially, to get to a spark plug? That makes me not want to buy my new gas gas ex 300 that I was going to buy.
By saying that the "2023 gas gas does not have the new chassis or engine", are you saying that I can change the spark plug without removing the tank even though it is buried down in there? Thank you.
I’ve noticed on my 23 TX300 with 20 hours the idle drops. At 10 hours it dropped so low my bike was dying during a race. Now at 20 hours it’s not quite dying but it’s gotten slow again. Anyone else having this issue?