My 919 and plugs - Wrist Twisters
 
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post #1 of 9 Old 08-05-2011, 07:28 AM Thread Starter
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My 919 and plugs

I just recently bought a used 919 with 12k on it. I want to change out the plugs in it but just the thought of going to buy iridium tipped plugs sort of puts a damper in the day.

Question is, do I need to buy those? Are they essential?

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post #2 of 9 Old 08-05-2011, 07:59 AM
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You don't need iridium in the 919.

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post #3 of 9 Old 08-05-2011, 08:03 AM
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run the standard plugs.... according to ldh they will actually last longer than the iridium's

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post #4 of 9 Old 08-05-2011, 09:29 AM
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I have run both and noticed no difference in performance.

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post #5 of 9 Old 08-05-2011, 10:38 AM
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Go with the standard Honda spark plugs.
I have doubled the change interval(8K) without incident and some owners have gone longer by cleaning their plugs.

Reference:https://www.wristtwisters.com/forums/...tml#post389752

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post #6 of 9 Old 08-05-2011, 11:27 AM
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I had my stock Honda's changed at 8k like it says and afterwards looking at them I'da waited. I do driveability at work and had I seen them before they replaced them I'dve declined the svc. Your riding habits may be different, this will affect wear. YMMV. Dave

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post #7 of 9 Old 08-05-2011, 11:29 AM
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Quote:
Originally Posted by nd4spdbh View Post
run the standard plugs.... according to ldh they will actually last longer than the iridium's
Is this true? I run iridiums now ...

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post #8 of 9 Old 08-06-2011, 08:35 AM
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Fine wire / Iridium plugs may help if you have a weak ignition system. While it's not going to hurt anything to use the Iridium plugs on your 919, it's not really helping anything either as Honda's ignition systems are very well engineered.

LDH and the others are right, just use a standard plug and save some dough.

As a side note, Autolite sparkplugs have the hardest electrodes I've ever seen on an over-the-counter plug, so if you can cross reference what will work in the 919 you may never have to change your plugs again!

Professional
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post #9 of 9 Old 08-06-2011, 11:16 AM
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Quote:
Originally Posted by nd4spdbh View Post
run the standard plugs.... according to ldh they will actually last longer than the iridium's
Ahhh, not quite.
My recollection is that he found power loss on at least one engine that had Iridiums in it.
My guess is that they were not too fresh, and probably had some ground electrode erosion, which would make a lot of sense re the dyno sensed power loss.
Iridiums are designed for 100,000 miles of commuter car engine life, and are anticipated to live their lives under low to medium loads, and be energized by modern ignition systems.
A 919 has the same type of coils that my 73 CB750 came with, although the primary side of the 919 ignition is electronic and not with points like the 750 had.
Eroded plugs do not let engines make peak power, period, a fact that has been known for decades.
Just because a plug fires every time does NOT translate that cylinder will make peak power every time.
Personally, I'm running conventionals in 919, and will stick with them.
But, our cars have Iridiums in them.
If I had a touring bike, did mega miles, and didn't care about every last bit of power, be it real or even measureable, I'd put Iridiums in.
Of course, a giggle would getting bent over plugs, while not having a bike mapped - as mapping will do far more than any plug differences might create.

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