Spark plugs

05-07-2012, 07:34 PM

I was checking out the ignition components with the multimeter today, being as I never rode this bike before I did the rebuild, and it's getting near to its road test once I get it off the sorn thingy. Everything checked out OK so I decided to take a look at the spark on my shiny new Iridium plugs. I was surprised to find the spark was of a very feeble apearance, yellow in colour. So I tried the test again with an ordinary GKN of the recommended type, but non Iridium, the spark with these was what I was looking for, nice big blue spark. I wonder has anyone had any issues with Iridium plugs, or any preference from experience with them. I have only run the motor on the bench as yet, and it starts ok with either type.

Headhunter · 06-07-2012, 10:01 AM

Okay this is not the technical answer you're looking for but I remember reading an article where it mentioned the irridium plug was not ideal for my Monster (620ie) and the spark would be greater with the normal NGK or Champion plug.

Like I say not a technical answer but do recall thinking to myself well those irridiums were a waste of money. That being said they seem to work fine but have never physically checked the spark.

06-07-2012, 03:04 PM

Thanks for that, at least I now know that's it's not just me being to picky, the non iridiums plugs will be what I run on .

07-07-2012, 08:13 PM

My friend with a Ducati 900 SS rates Brisk spark plugs very highly, certainly not cheap but he won't be using any others from now on.
Here they are on eBay

05-07-2012, 07:34 PM	#1
Dookbob Guest Posts: n/a	Spark plugs I was checking out the ignition components with the multimeter today, being as I never rode this bike before I did the rebuild, and it's getting near to its road test once I get it off the sorn thingy. Everything checked out OK so I decided to take a look at the spark on my shiny new Iridium plugs. I was surprised to find the spark was of a very feeble apearance, yellow in colour. So I tried the test again with an ordinary GKN of the recommended type, but non Iridium, the spark with these was what I was looking for, nice big blue spark. I wonder has anyone had any issues with Iridium plugs, or any preference from experience with them. I have only run the motor on the bench as yet, and it starts ok with either type.

06-07-2012, 10:01 AM	#2
Headhunter THFC Join Date: Nov 2005 Location: London Bike: M620ie Posts: 829	Okay this is not the technical answer you're looking for but I remember reading an article where it mentioned the irridium plug was not ideal for my Monster (620ie) and the spark would be greater with the normal NGK or Champion plug. Like I say not a technical answer but do recall thinking to myself well those irridiums were a waste of money. That being said they seem to work fine but have never physically checked the spark. __________________ Men occasionally stumble over the truth, but most of them pick themselves up and hurry off as if nothing ever happened. Sir Winston Churchill

06-07-2012, 03:04 PM	#3
Dookbob Guest Posts: n/a	Thanks for that, at least I now know that's it's not just me being to picky, the non iridiums plugs will be what I run on .

07-07-2012, 08:13 PM	#4
urbanfireblade Guest Posts: n/a	My friend with a Ducati 900 SS rates Brisk spark plugs very highly, certainly not cheap but he won't be using any others from now on. Here they are on eBay