wat size is a 400ex soark plug

[brapbrap13]

my bike wont ru n everyone is waiting on me i wanan check the plug please helpp

[duneaticdave]

well a ngk spark plug for a 400 is a dpr8z or a dpr9z.

[jsmith2232]

stock is a DPR8Z

[GPracer2500]

18mm

They're kind of a pain to get out because many sockets are too thick to fit all the way down in the head. The plug wrench in the tool kit is the best choice. If you don't have the tool kit then you may need to jet a thin wall socket.

Some report that regualar sockets work fine for them. I suspect variations in the casting of the head make some a tighter fit than others....

[exrider008]

Originally posted by duneaticdave
well a ngk spark plug for a 400 is a dpr8z or a dpr9z.

NKG dosent make a dpr9z;) its a dpr8z

[GPracer2500]

Originally posted by exrider008
NKG dosent make a dpr9z;) its a dpr8z

No. The DPR9Z is the same as a DPR8Z but of a colder heat range.

[exrider008]

Originally posted by GPracer2500
No. The DPR9Z is the same as a DPR8Z but of a colder heat range.

thats odd my dealer and my local auto parts store told me that nkg dosnt make a 9 and they go 8 and down.

[GPracer2500]

Great example of why not to trust your dealer or auto parts store! lol

I'm not breakin' your balls, I'm just letting you know there is a 9. The manual even lists the 9 as an optional plug.

[exrider008]

Originally posted by GPracer2500
Great example of why not to trust your dealer or auto parts store! lol

I'm not breakin' your balls, I'm just letting you know there is a 9. The manual even lists the 9 as an optional plug.

ya i gess shouldnt listen to my dealer cuz this isnt the first time they have told me something like this.:o

[miller821]

Ya, I run a 9 in mine.

[peecout]

I thought the 9 was a hotter plug?

[GPracer2500]

It can depend on the manufacture. I think there may still be a few companies that has a scale going the opposite direction. But for NGK...

http://www.akamoto.co.uk/images/NKG-spark-plug-2.gif

[peecout]

Wow! the whole time I had my Jetskiis I ran br9es plugs because I thought they were hotter than the br8es. I was told that when I bought the plugs. Kinda makes me feel dumb! Oh well, thats what I get for believing someone at Schucks.

[miller821]

Originally posted by peecout
Wow! the whole time I had my Jetskiis I ran br9es plugs because I thought they were hotter than the br8es. I was told that when I bought the plugs. Kinda makes me feel dumb! Oh well, thats what I get for believing someone at Schucks.

Ya I was told that to... But thanks for the info. cause now I know.

Originally posted by GPracer2500
18mm

They're kind of a pain to get out because many sockets are too thick to fit all the way down in the head. The plug wrench in the tool kit is the best choice. If you don't have the tool kit then you may need to jet a thin wall socket.

Some report that regualar sockets work fine for them. I suspect variations in the casting of the head make some a tighter fit than others....

I believe that it is a 13/16 inch socket

[GPracer2500]

Originally posted by EXking
I believe that it is a 13/16 inch wrench

Nope. It's more like 23/32. But it seems I've lost my 23/32 deep socket yet AGAIN! Arghhhh! I go through like 1 a week. :ermm:

Seriously though, a 3/4" would work if you could get it to fit in the head (which isn't likely).

[exrider008]

i would just go buy the plug wrench that came in the tool kit trust me ull be glad u did.

[Halter]

Originally posted by GPracer2500
Great example of why not to trust your dealer or auto parts store! lol

I'm not breakin' your balls, I'm just letting you know there is a 9. The manual even lists the 9 as an optional plug.

oh tell me about it...I laughed at one of my friends brother in law...he bought this brand new 3 seater big ole jetski ... well .... he was ridin it and sucked a stick....lol...instead of just takein the stick out himself by just grabin it and pullin it out..he took it to local dealer...they said the stick... bent his stainless steal impeller... and scared the housin....

$600 Dollar bill..LOL...I was like dang..I would just got it out myself and not worry about it :)