What spark plug you recommend?

[Impala400]

What spark plug all you guys recommend? i think i might need one if not it would be nice to have one for a backup. thanks

[Silverfox@C&DRacing]

We use the NGK dpr8z :square

[Impala400]

that a pretty common plug? so i could go to my local dealer and get it? and pick it up that day?

[QuadTrix6]

yea a dealer should have ity

[AtvMxRider]

Originally posted by Impala400
that a pretty common plug? so i could go to my local dealer and get it? and pick it up that day?

I get mine from Napa.

[Dave400ex]

I use NGK. I run the D7EA in mine.....

[PHIL_B54]

i got a couple to rejet and out of 4 places here in town everyone looked at me like they have never heard of a 400ex
i had to special order them

[Impala400]

my quad is pretty so would any plug work(that fits the 400ex)? or would i have to read the plugs to find out?

[Dave400ex]

Don't just run any plug. I am only running the D7EA because TC told me to. I would stick to stock unless you talk to a engine builder that says different....

[DaveEX7]

Spitfire Plug user here ;)

[Impala400]

i am just going to go to wal-mart tomorrow and see if i can find a plug just to have, since i dunno how old the plug in the quad is.

[honda400exrider]

dude, just go to yer local dealer and get a plug for yer model. if they dont have it, they can order, but im sure they know... i wouldnt stick with the walmart idea though, but my plug has only fouled once in two years, so u dont have to worry about it that much normally.

[Impala400]

wal-mart around me sells NGK and splitfire

[Sparks425Ex]

Splitfire. I have ran both and I rally could care less. But I can get Split fires like 5 mins down the road. Just easier.

[honda400exrider]

ooo ok cause the walmarts and stuff around me are like no name brands... lol

[Dave400ex]

Just don't walk into your Yamaha dealer and ask for a DPR8Z unless they sell Honda too becuase that plug is only a Honda plug. lol

[optikid123]

yea def dont just any old plug and stick it in there man. thats trouble i run a ngk dpr8z thats what came with my quad i just bought 10 off of rockymountainatv for like a buck each

[Impala400]

Well i got an autolite plug, i have used these in my car and they are pretty good, not the test is the ATV :) wish me luck

[330EXman]

i run split fire real nice perfect plug
i use one for qualifying and then a new one for the race lol

i dont worry bout the money

[RAPTORAZ]

I run the same plug in my Raptor and my 416EX. Splitfire Triple Platinum. TP416C. Both have been in there for about a year and still look new every time I check them.

[bmw500hp]

Originally posted by WarriorMan
Don't just run any plug. I am only running the D7EA because TC told me to. I would stick to stock unless you talk to a engine builder that says different....

David...Did Tom tell you why he choose D7EA...I want to get one!

[Dave400ex]

Well I had called him before because I was having Jetting problems after I got my Pipe. I had a lot of problems and was going through plug after plug, so I switched to the Jetting he told me. Then I still had a few problems, so I called and told him that and he said my Jetting was fine to run that plug and ever since then I haven't had a single problem. I just went out and started the 400 today after a month of it sitting there, and she fired right up.....

[Ralph]

Originally posted by Silverfox@C&DRacing
We use the NGK dpr8z :square

unless u are running wide open alot then get dpr9z

[NoWingNoPrayer]

i have always used DPR8Z's just cause it what the quad came with and they seem to last about 6 months each..

the splitfire tripple platinums sound awesome i might try them next.

anyone know if the Bosch +4s will fit in a 400?

[nakomis0]

Its kinda a waste of money to buy anything other than a NGK. either the dpr8z or 9z.

And its very rare that an auto parts store will have a 400ex plug in stock. Its ussually a special order. And i'm gonna say there is no chance in h@ll Walmarts gonna have one.:blah

[RAPTORAZ]

Originally posted by nakomis0
Its kinda a waste of money to buy anything other than a NGK. either the dpr8z or 9z.

And its very rare that an auto parts store will have a 400ex plug in stock. Its ussually a special order. And i'm gonna say there is no chance in h@ll Walmarts gonna have one.:blah

The main reason I use the Splitfire's is because of their availability. The TP416C is a pretty common plug for about the same price (approx. $4) as an NGK from the dealer. I get them from the local NAPA autoparts.

[AtvMxRider]

Originally posted by AtvMxRider
I get mine from Napa.

[Impala400]

wallmart had a plug for me wasn't splitfire, or NGK bit it was autolite and its the one they recommend in there book.....so there :blah walmart has the plugs.....might only be the walmart around me but hey whatever works

[TheChknhwk]

Shoot, I bought champion plugs from Meijer around here & they work just fine & they're even less than the NGK's. Also an english plug wrench will fit on them as opposed to using that awful plug wrench that comes w/the 400...

Hawk

[Impala400]

whats the champion plug you use?

[TheChknhwk]

I'm not exactly sure, but most places that have champion plugs have a champion model guide book that should give you the plug# you need to get the right plug for your EX. Hope this helps. We have never had any probs w/the champion, and my dad runs one too on his stock EX.

Hawk

[YZROOSTINYA]

THE DPR9Z IS A colder PLUG THEN THE DPR8Z


you would want to use the DPR8Z on a stock bike, and the DPR9Z on a bike that is wide open all the time, you had it reversed LRD

[ChadEXer]

The DPR8Z is the stock spark plug,,the DPR9Z is a colder plug and would be good for wide open riding, long races etc, and the DPR7Z like Warriorman refered to is a hotter plug! I run the DPR8Z in mine which TC told me to run the 8 or 9, either one would be fine for my bike. Also you guys might want to check it out but i can get the DPR8Z(stock plug) at my ABC Auto Parts store! They have a slightly different number than the stock Honda plug but its the very same plug, and its about half the price of the one from the Honda shop!!(Because NGK distrubutes the plug for Honda under a different part number) Just call ABC and tell them you want a plug for a 400EX its a DPR8Z, and they have a chart that matches the Honda number to the NGK number that ABC stocks!! my ABC store had 45 of them in stock last time I was there!! The only difference is it doesnt say Honda anywhere on the box, therefore its much cheaper!!

[Dave400ex]

When Tom told me to run the D7EA I asked him if it would make the motor run any hotter, and he said it wouldn't. So this plug has been working great for me...

[ChadEXer]

Originally posted by WarriorMan
When Tom told me to run the D7EA I asked him if it would make the motor run any hotter, and he said it wouldn't. So this plug has been working great for me... Yeap, the plug has a little hotter spark, but wont have any noticeable heat on the engine.

[Dave400ex]

Well that plug has help mine a lot. I won't run without it now. I went from fouling plugs all the time, to just about never now.