Irridium spark plugs

If you need technical information or help with your late dry clutch Ducati S2, MHR 900 or Mille engine - post your FAQs, comments & questions here.
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Peter Mille
MHR / S2
Posts: 472
Joined: Fri Aug 13, 2004 1:12 am
Location: The Netherlands, Europe.

Irridium spark plugs

Post by Peter Mille » Mon Sep 25, 2017 10:04 pm

Anybody tried (NGK) Irridium spark plugs in their Bevel?

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Craig in France
Cagiva Indiana
Posts: 767
Joined: Tue Mar 23, 2004 3:58 pm
Location: Montpellier, France

Re: Irridium spark plugs

Post by Craig in France » Tue Sep 26, 2017 3:10 am

Yeah, Peter, I did a few years back - the bike is a SSD, btw, so it might be different with your Mille.

I tried a pair of NGK 3419 BR6HIX. I didn't stick with them. I had the feeling that the bike didn't run as 'clean' as with standard plugs. And, since the plugs aren't difficult to get to, I went back to regular B6HS.

I use iridiums in my Laverda Formula, however - and they work fine. Which is just as well, 'cos those plugs are hard to get to :( .

Ciao

Craig

Peter Mille
MHR / S2
Posts: 472
Joined: Fri Aug 13, 2004 1:12 am
Location: The Netherlands, Europe.

Re: Irridium spark plugs

Post by Peter Mille » Tue Sep 26, 2017 4:00 am

OK, thanks.
I bought NGK BPR7HIX, instead of the NGK BPR7HS that was suggested by the manufacturer of the Sachse ignition that is on my Mille since this summer.
I have put the plugs in, but haven't started the bike yet...
Btw, those NGK Irridium are available at www.mister-auto.nl, and they are a France based company, so you would be able to buy them there, I guess..

wdietz186
851
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Joined: Sun Sep 10, 2006 4:40 pm

Re: Irridium spark plugs

Post by wdietz186 » Tue Sep 26, 2017 5:23 am

The Iridium plugs are good if you have upgraded the ignition system. They have a lower firing voltage when they are clean but they do require a higher output ign. system to keep them clean as the center electrode is smaller than regular plugs. The errant blobs of uncombustibles that float around in old bevel engines can smother the fine wire if the voltage isn't up to snuff. The extended tip does help [ the P in the plug number] by being deeper in the chamber and more exposed during combustion.

Peter Mille
MHR / S2
Posts: 472
Joined: Fri Aug 13, 2004 1:12 am
Location: The Netherlands, Europe.

Re: Irridium spark plugs

Post by Peter Mille » Wed Sep 27, 2017 11:11 am

I've started the Mille today, no change in behavior, but....cold idling has improved a lot!
In the past, with original Bosch ignition, and "normal"plugs, cold idling was a pain. but that is all gone now, after releasing the choke lever, the engine was idling perfect!

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