Best motorcycle spark plugs question

Mechanical woes? Ask other members for tips and advice.

Moderators: Aladinsaneuk, MartDude, D-Rider, Moderators

Post Reply
Message
Author
Ben
Clubman Racer
Clubman Racer
Posts: 262
Joined: Thu Sep 12, 2019 9:35 pm
Main bike: Kawasaki ZX-10R

Best motorcycle spark plugs question

#1 Post by Ben » Sun Apr 26, 2020 9:37 am

Hi all, I'm buying new spark plugs for my Hypermotard and the online parts finder lists the following:

Spark plug 1: NGK DCPR8E
Spark plug 2: NGK DCPR8EIX

I'm a little confused. Does this mean a different plug for each cylinder? (I'm thinking one runs hotter than the other, so that might make a difference) or is it just a case of 'Here's two options, a regular and an Iridium' pick which type you want to run?

Ta, Ben

fatboy
World Champion
Posts: 3774
Joined: Thu Nov 03, 2011 7:48 pm
Location: BATH

Re: Best motorcycle spark plugs question

#2 Post by fatboy » Sun Apr 26, 2020 11:38 am

The number 8 denotes the ' heat' range, eg 7 or 9 would be hotter or cooler, not sure if a lower number is the cooler or hotter.
I would go for the iridium, longer working life, most iridium plugs have 3 prongs pointing to the electrode as opposed to single on regular plugs.
Iridiums are a bit pricier though
Cleverly disguised as an adult !

User avatar
mangocrazy
Admin
Admin
Posts: 3894
Joined: Thu Jul 17, 2008 3:24 pm
Location: Sheffield, UK

Re: Best motorcycle spark plugs question

#3 Post by mangocrazy » Sun Apr 26, 2020 7:37 pm

The rear cylinder on Ducatis normally runs hotter, so the Iridium plug may be specified for the rear cylinder?

Wally
Despatch Rider
Posts: 50
Joined: Wed Dec 24, 2014 12:48 am
Location: South Lakes

Re: Best motorcycle spark plugs question

#4 Post by Wally » Sun Apr 26, 2020 10:51 pm


User avatar
Dr Ridin
Despatch Rider
Posts: 16
Joined: Sat Apr 05, 2008 8:39 am
Location: Queensland, Australia

Re: Best motorcycle spark plugs question

#5 Post by Dr Ridin » Mon May 11, 2020 8:23 am

fatboy wrote:
Sun Apr 26, 2020 11:38 am
most iridium plugs have 3 prongs pointing to the electrode as opposed to single on regular plugs
Not quite true. Iridium plugs have a very fine Iridium alloy centre electrode and a single side/ground electrode. I have Irdium plugs in all my bikes. Multiple side/ground electrode spark plugs are not Iridium.

fatboy
World Champion
Posts: 3774
Joined: Thu Nov 03, 2011 7:48 pm
Location: BATH

Re: Best motorcycle spark plugs question

#6 Post by fatboy » Mon May 11, 2020 3:08 pm

Dr Ridin wrote:
Mon May 11, 2020 8:23 am
fatboy wrote:
Sun Apr 26, 2020 11:38 am
most iridium plugs have 3 prongs pointing to the electrode as opposed to single on regular plugs
Not quite true. Iridium plugs have a very fine Iridium alloy centre electrode and a single side/ground electrode. I have Irdium plugs in all my bikes. Multiple side/ground electrode spark plugs are not Iridium.
So my iridium plugs with 3 prongs ,with ND Iridium on the box are imposters?
Cleverly disguised as an adult !

User avatar
Dr Ridin
Despatch Rider
Posts: 16
Joined: Sat Apr 05, 2008 8:39 am
Location: Queensland, Australia

Re: Best motorcycle spark plugs question

#7 Post by Dr Ridin » Mon Jun 01, 2020 6:52 am

fatboy wrote:
Mon May 11, 2020 3:08 pm
So my iridium plugs with 3 prongs ,with ND Iridium on the box are imposters?
Probably -I've never seen an Iridium with multi ground electrodes. Does it say Iridium or Platinum on the box? Post up the pic of the box with the plug number and if I'm wrong - then I'll apologise. BTW - if by ND you mean Nippon Denso:

https://www.denso.com/global/en/product ... diumpower/

Post Reply