Vintage and Classic Hondas

Iridium Spark Plugs

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TOOLS1

Re: Iridium Spark Plugs

Administrator

They should be factory set. However i think it is .045
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Life is not about the number of breaths, you take, but the moments that take your breath away.
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1976 CB 750-A X 2
1977 CB 750-A X 4
1977 CB 750-K
1976 CB 750 F
1981 CB 750
1966 Kawasaki SG 250
1981 KZ 750 LTD
1973 CB 350
1979 CM 185 Twinstar
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shinyribs

Re: Iridium Spark Plugs

Administrator

Cool.Thanks. Poor guy,you must get tired of answering everything for everybody. But I'm glad you do

TOOLS1

Re: Iridium Spark Plugs

Administrator

I'm still hoping, for songs of praise.

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Dw07u

Re: Iridium Spark Plugs

Do they greatly improve the starting or just more on performance?

Dress for the fall, not the ride...

sgtslag

Re: Iridium Spark Plugs

I was checking into replacing my coils, due to poor starting, having to grind it for several seconds, resting, then grinding a few more seconds, to fire it up... I put in Iridium plugs, and the first time I hit the button, it was running almost instantly! I literally jumped. Now, 5,000+ miles later, it still starts instantly, if it has gas in the carbs (i.e., if it hasn't been sitting for days). They're worth the money, and easier to change than the coils. I won't be replacing my original coils until they burn out. Cheers!

1979 CB750K (sold, 2012, but not forgotten)
1983 Kawasaki 440 LTD Belt Drive (sold, 2011)
1993 Kawasaki Voyager XII

Re-run

Re: Iridium Spark Plugs

Administrator

In reply to this post by shinyribs

Gap is actually supposed to be set at stock however, people have been able to go up some. NGK actually says to NOT change the gap as you may damage the plug. The center electrode is so fine that it can be broken easily. So if you DO gap them, be super careful to not touch the electrode.
Stock sohc gap is about .028, this would be about the middle.

The ride IS the adventure. The destination is just to get gas!

shinyribs

Re: Iridium Spark Plugs

Administrator

Thats kinda what I thought too Rerun. I just installed them with the factory gap. Never measured it. Looked to fragile.It looks more like a light bulb filament than a plug electrode!

My bike has an electronic ignition on it and always seems to start well,so I cant speak on that. The idle with the engine cold was much more stable.Power below 3000 rpms is much smoother,but i wouldn't say that it was an actual huge HP gain.Just smoother. You can lug the bike around at 1000-1500 rpms and tell a noticeable difference in power in that situation.Power from 3000-6000 seemed same as before.Power from 6000+ seemed to be equal power,but the engine feels/sounds noticeably smoother. I'm happy with them.Fuel mileage yet to be determined.