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Spark Plugs
Posted: Wed Feb 13, 2008 3:07 pm
by phuk72
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?
Posted: Wed Feb 13, 2008 3:15 pm
by youngy
UK plug is DPR8EA-9.
Posted: Wed Feb 13, 2008 3:17 pm
by phuk72
Are you sure? What makes you say that?
Posted: Wed Feb 13, 2008 3:20 pm
by youngy
My Yamaha parts manual says so.
Posted: Wed Feb 13, 2008 3:22 pm
by phuk72
youngy wrote:My Yamaha parts manual says so.
Is the parts manual definitely for a UK bike?
Posted: Wed Feb 13, 2008 3:24 pm
by youngy
Yes. It says "Europe 4UN3" and "Switzerland, Austria 4VN2" on it.
Posted: Wed Feb 13, 2008 3:26 pm
by youngy
also (and i know this doesn't mean owt) Kedo list DPR8EA-9 as "standard"
Posted: Wed Feb 13, 2008 3:26 pm
by phuk72
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?
Posted: Wed Feb 13, 2008 3:28 pm
by youngy
and the colder plug has the higher number (for NGK)
Posted: Wed Feb 13, 2008 3:28 pm
by youngy
pm me your email address. I did try to get it to Max for hosting, but alas...........
Posted: Wed Feb 13, 2008 3:29 pm
by phuk72
Ta - PM on way
Posted: Wed Feb 13, 2008 3:32 pm
by youngy
on it's way - 3MB pdf.
Posted: Wed Feb 13, 2008 3:33 pm
by youngy
btw................NGK list DPR8EA-9 as standard on their website too.
http://www.ngkpartfinder.co.uk/mc_searc ... engine=850
Posted: Wed Feb 13, 2008 3:35 pm
by phuk72
A few places list the 9 as well - can't remember which sites now
Got the parts list btw - thanks again
Posted: Wed Feb 13, 2008 3:36 pm
by phuk72
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?