Spark Plugs

Post by **phuk72** » Wed Feb 13, 2008 3:07 pm

Right then - some help please.

As I understand it the NGK DPR8EA plug is standard for Japanese / Aus market and DPR9EA for UK market.

Disregarding the letters, IIRC the lower the number the colder the plug operates at (hence the 8 being used in countries where the ambient temeperature is higher than in teh UK where the 9 is used).

Is that right?

And if it is, should I be using an 8 rather than a 9 in a tuned motor since it runs hotter?

youngy · Post by **youngy** » Wed Feb 13, 2008 3:15 pm

UK plug is DPR8EA-9.

Post by **phuk72** » Wed Feb 13, 2008 3:17 pm

Are you sure? What makes you say that?

youngy · Post by **youngy** » Wed Feb 13, 2008 3:20 pm

My Yamaha parts manual says so.

Post by **phuk72** » Wed Feb 13, 2008 3:22 pm

youngy wrote:My Yamaha parts manual says so.

Is the parts manual definitely for a UK bike?

youngy · Post by **youngy** » Wed Feb 13, 2008 3:24 pm

Yes. It says "Europe 4UN3" and "Switzerland, Austria 4VN2" on it.

youngy · Post by **youngy** » Wed Feb 13, 2008 3:26 pm

also (and i know this doesn't mean owt) Kedo list DPR8EA-9 as "standard"

Post by **phuk72** » Wed Feb 13, 2008 3:26 pm

In which case I thank you. (Can I have a copy btw

)

So, should I be looking for a 7 for a tuned engine as it runs hotter?

youngy · Post by **youngy** » Wed Feb 13, 2008 3:28 pm

and the colder plug has the higher number (for NGK)

youngy · Post by **youngy** » Wed Feb 13, 2008 3:28 pm

pm me your email address. I did try to get it to Max for hosting, but alas...........

Post by **phuk72** » Wed Feb 13, 2008 3:29 pm

Ta - PM on way

youngy · Post by **youngy** » Wed Feb 13, 2008 3:32 pm

on it's way - 3MB pdf.

youngy · Post by **youngy** » Wed Feb 13, 2008 3:33 pm

btw................NGK list DPR8EA-9 as standard on their website too.

http://www.ngkpartfinder.co.uk/mc_searc ... engine=850

Post by **phuk72** » Wed Feb 13, 2008 3:35 pm

A few places list the 9 as well - can't remember which sites now

Got the parts list btw - thanks again

Post by **phuk72** » Wed Feb 13, 2008 3:36 pm

youngy wrote:and the colder plug has the higher number (for NGK)

So the 9 is the colder plug (versus the

- is that what you are saying?