Iridium plugs?

[jetjock79]

I'm starting a new thread only because it's a change of subject, and when people (like me) are searching for answers,.....it sucks to have them buried in a different post. Anyway, now that the bike is running well, I was wondering if the '85 NightHawk 650 could run Iridium plugs. I know we need resistive type plugs, and didn't know if the Iridiums could work. Thanks!

[Hondo]

Sureb, they'll work fine.

The iridian plugs just last longer than standard ones.

[jetjock79]

Any other positives......like better idling, more power, or better MPG. I can see more MPG and possibly better idling.......but more power?

[Hondo]

There will not be any noticeable performance gains, at least I've never heard of any.

What the iridium plugs are is tough. The iridium is very tough and the plugs will last longer than a standard plug.

[fishmeister]

I use them and like them. Starts right up, I believe they throw better spark.

[gammer]

I use 'em too. I find fresh plugs (Iridium or normal) make the bike feel 'peppy' for a bit. But its a placebo thing and it wears off.
They do last longer...and so they should considering the price of them.

[jerjohn]

My bike would usually start on the 3rd or 4th revolution when cold. I switched to iridium plugs and it starts on the second revolution when cold and seems to start before I sit down when warm. No performance gains here other than starting.

[ndmeistr]

Hey Guys,

I just found this thread as I was considering getting iridium plugs for my bike. A couple of questions I thought of while doing research are:

• Is there a difference between 7's, 8's and 9's?
• Which type would you recommend for an 83 550?

[fishmeister]

NGK     IX iridium     2202     DPR8EIX-9           $7.83

http://www.ngk.com/results_appOther.asp?otherMotiveID=225117&mfid=1

 

[windrider]

Iridium plugs in your bike will do nothing but give your bike a new set of very expensive spark plugs.  Iridium plugs have been around a long time, and were developed for airplane engines,  They help burn off the lead that is present in aviation fuel, but can't be used in a street vehicle anymore.  As for bolting on more power or changing a plug type, etc., spend your money wisely.  You can shift the power band around a little, better low or high, but extremely hard to add any power with a bolt on device or a spark change.  My two cents, I'll get down now.

[cmyers]

Hey Guys,

I just found this thread as I was considering getting iridium plugs for my bike. A couple of questions I thought of while doing research are:

• Is there a difference between 7's, 8's and 9's?
• Which type would you recommend for an 83 550?

Yes there is a difference between the numbers. The numbers indicate temperature range of the plugs. IMO there is no reason to change the temp rating from the stock plug, unless you are running a cooler plug for summer temps and want a hotter plug for cold winters.

Changing over to a hotter plug that is to high for the engine can do damage.

For some reason I believe NGK is different than other plugs with the Hotter plug being the lower number. Normally the higher the number the Higher the temp.

EDIT: I went and looked it up, the heat range is indicated by the number in the middle, and for NGK it is lower the number the hotter the plug. The last number on the plug indicates the gap.

[cmyers]