[west940]

Just bought a set of NKG Iridium spark plugs for my 01' Heritage and was wondering if anyone has tried them?

[SPORSTERBOY]

I ran the hd plugs then switched to the split fire, couldn't tell you if they make a difference, I never noticed, but I'm sure someone will give the run down on the differn't plugs.

[chucktx]

i have not found that the high priced plugs run any better than the ones from hd........3bucks apiece aint to bad a price.........

[Lucifer]

The NGK's should work fine for ya....like chuck said no difference with the high priced plugs, a sharp bright blue spark is all the combustion chamber needs, doesn't matter what type of plug provides it. the HD plugs here in Canuck land is around $7.00Cdn, so I use the $3.00 Champion RA8HC in the Twinkie and the Evo

[Art_NJr]

Originally Posted by west940

Just bought a set of NKG Iridium spark plugs for my 01' Heritage and was wondering if anyone has tried them?

I got Denso Iridium plugs for a race engine & really like 'em - I assume the NGK's are basically the same. That engine has 13:1 compression & while the plug change showed no difference on the dyno, the engine starts almost instantly & runs a bit smoother. But for the street bikes, good ol' Autolite plugs @ about $1.75 ea. work every bit as good.

And a lot of the fancy plugs require more voltage than a stock ignition system supplies - you can actually lose performance with expensive plugs & a stock ignition. Race engine's got dual-plugged heads, a coil for each cylinder, etc. - nothing stock about it & a LOT more voltage to the plugs.

But what I have seen is the more expensive plugs & definitely the Iridiums, do last a lot longer than a standard type like the Autolites I like. Enough longer to justify the additional cost? You'd have to be the judge on that.

[west940]

Originally Posted by Art_NJr

I got Denso Iridium plugs for a race engine & really like 'em - I assume the NGK's are basically the same. That engine has 13:1 compression & while the plug change showed no difference on the dyno, the engine starts almost instantly & runs a bit smoother. But for the street bikes, good ol' Autolite plugs @ about $1.75 ea. work every bit as good.

And a lot of the fancy plugs require more voltage than a stock ignition system supplies - you can actually lose performance with expensive plugs & a stock ignition. Race engine's got dual-plugged heads, a coil for each cylinder, etc. - nothing stock about it & a LOT more voltage to the plugs.

But what I have seen is the more expensive plugs & definitely the Iridiums, do last a lot longer than a standard type like the Autolites I like. Enough longer to justify the additional cost? You'd have to be the judge on that.

Thanks for the info.
It is to dang cold to ride. Snow sucks. I look forward to riding season this year and trying out new plugs.

[ringo912]

What Art said. I run the same Champion as Lucifer, $1.75 here in the States. The HD plugs are actually the Champions in disguise, your paying the extra for the MOCO logo.