Plug colour

Fast Eddie · Mar 10, 2019

I’m more used to looking at plugs out of my older, oil burning ‘classics’.

What say you fine fellows of these out of the 961?

These were removed after a nice 50 mile ride, some brisk acceleration, 85mph cruise and a couple of miles through slow traffic to home.

They are NGK Iridium, not the stock plugs.

First two are from the LHS, second two are from the RHS...

Raphi · Mar 10, 2019

I my opinion good looking, but I am no mechanic.
Which plugs do you use:
CR7EIX or
CR9EIX?

TonyA · Mar 10, 2019

Here are mine from August 2016 .

I have the same ashy grey deposits .

Fast Eddie · Mar 10, 2019

Raphi said:
I my opinion good looking, but I am no mechanic.
Which plugs do you use:
CR7EIX or
CR9EIX?

CR9EIX.

Fast Eddie · Mar 10, 2019

Mine look whiter than yours Tony. If I’d taken them out of my 850 Commando or Bonnie I’d be worried it was too lean.

I guess it’s ok in this ‘modern’ engine!

Voodooo · Mar 10, 2019

Looking perfect!

What you really don’t want to see are tiny aluminum specs from detonation from the piston.

TonyA · Mar 10, 2019

Hello FE , Norton said the Euro 4 machines are run leaner than Euro 3 I think ? You have had your aftermarket exhaust map installed also correct ?

Fast Eddie · Mar 10, 2019

TonyA said:
Hello FE , Norton said the Euro 4 machines are run leaner than Euro 3 I think ? You have had your aftermarket exhaust map installed also correct ?

Factory open pipe remap, yes.

TonyA · Mar 10, 2019

I also got a chuckle when you called it a modern engine.

Fast Eddie · Mar 10, 2019

TonyA said:
I also got a chuckle when you called it a modern engine.

Hence the use of inverted comma’s ...

Fast Eddie · Mar 11, 2019

I changed the plugs for new ones, just thinking it’s the start of the season, so I’ll treat it!

And waddya know... it’s starting better, much more instantaneous rather than having to crank over a bit.

So maybe the plugs were starting to degrade?

Only been in 1000 miles (inc track use) and these things are supposed to last yonks.

I’m thinking to maybe try one grade cooler, a #10

What do you fine fellows think?

Voodooo · Mar 11, 2019

https://www.dragstuff.com/techarticles/how-to-read-plugs.html

Britfan60 · Mar 11, 2019

Fast Eddie said:
I changed the plugs for new ones, just thinking it’s the start of the season, so I’ll treat it!

And waddya know... it’s starting better, much more instantaneous rather than having to crank over a bit.

So maybe the plugs were starting to degrade?

Only been in 1000 miles (inc track use) and these things are supposed to last yonks.

I’m thinking to maybe try one grade cooler, a #10

What do you fine fellows think?

I say I had 7,000 miles on my original plugs when I changed them. They looked and still worked fine, but wanted to give the iridiums a try. Wondering if you have a defective plug.

Plug colour

Fast Eddie

Raphi

TonyA

Fast Eddie

Fast Eddie

Voodooo

Guest

TonyA

Fast Eddie

TonyA

Fast Eddie

Fast Eddie

Voodooo

Guest

Britfan60

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