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Discussion Starter · #1 ·
The Honda 919 manual saids to change the plug at 8000 miles. I'm at 10,000 and they look and run good (except #3 plug, couldn’t get it out). My question is, has anyone got more mileage out of their plugs than 8000 miles?
 

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I've gotten more mileage out of a set of plugs by pulling them out and cleaning them up. I just replace them now (just as much work, less frequency, more cost)

To get #3 out, use the tool kit that comes with the bike. If you didn't get a tool kit, I suggest a swivel attachment or u-joint for your ratchet/socket.
 

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Serial Monogamist
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I have doubled the interval for plug changes on the 919 without consequence. 16K is just fine by me and I am coming up on another plug change at 48K. I am going to try a set of CR8EHIX-9(Iridium) in my ST1300A next time.

The tool that Honda supplied in the factory kit saved the day for me when changing plugs.

Doc
 

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Check you manual again, my manual says check plugs at 12,000 kms (8,000 miles). Replace at 24,000 (16k miles).

Obviously if they look crap when checking then replace, otherwise good to go.
 

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McTavish
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Check you manual again, my manual says check plugs at 12,000 kms (8,000 miles). Replace at 24,000 (16k miles).

Obviously if they look crap when checking then replace, otherwise good to go.
If the engine is not using oil, you are running pump gas, and have factory spec plugs, something is wrong of the plugs are not good for 24 K kms or 16 k miles.
Like the gent said, the manual says check at half distance, not change at half distance.
 

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What's a 919?
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Technically if your gap is correct, no corrosion is present, you can clean them and keep using them for a long time, but...

id rather run a good quality standard plug like the ones that comes in the bike rather than cheap iridium.
Just wondering how you think a metal that is stronger, harder, and can withstand higher temps than standard plugs, cheap?
 

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Le So Cal Troll
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Technically if your gap is correct, no corrosion is present, you can clean them and keep using them for a long time, but...



Just wondering how you think a metal that is stronger, harder, and can withstand higher temps than standard plugs, cheap?
if the 919 needed iridium it woulda came with an iridium... there is a reason mr honda used a standard style plug to begin with and ill be stickin with just that as it works like a charm.
 

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What's a 919?
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if the 919 needed iridium it woulda came with an iridium... there is a reason mr honda used a standard style plug to begin with and ill be stickin with just that as it works like a charm.
Though he died well before the 919, I would say Honda, just like nearly every other manufacturer uses standard plugs, because standard riders don't really care that much about their machines. But for those who want to give our prize possessions every extra goodie they can, even if being minimal improvement, there are parts/accessories that improve on the technology available at the time the bike was made.

With the mentality of; do motorcycles need to be improved from their basic design, you should apply for a job with Harley-Davidson.

It's like Hot Sauce, does pizza need to be splattered with it? No. Does it make it better? Yes.
 

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Discussion Starter · #14 ·
My owner's manual does say to replace plugs at 8000 miles/12.8Km. Here in Canada, the Honda dealer wants $15 plus tax for these NGK CH9EH-9 plugs. I will be cleaning them and checking the gap.
 

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I think I changed mine at 24,000 miles. For me, it was a waste of time and money because the bike didn't run any better. The old ones looked fine. Actually, they ended up in a friend's 600.
 

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My owner's manual does say to replace plugs at 8000 miles/12.8Km. Here in Canada, the Honda dealer wants $15 plus tax for these NGK CH9EH-9 plugs. I will be cleaning them and checking the gap.
My local stealer quoted me $12.99 for them. I asked him, "for all four, right?" and then walked out when he said no...they can be had at many auto parts stores for less than $5 Napa, Checker, Autozone....
 

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Though he died well before the 919, I would say Honda, just like nearly every other manufacturer uses standard plugs, because standard riders don't really care that much about their machines. But for those who want to give our prize possessions every extra goodie they can, even if being minimal improvement, there are parts/accessories that improve on the technology available at the time the bike was made.

With the mentality of; do motorcycles need to be improved from their basic design, you should apply for a job with Harley-Davidson.

It's like Hot Sauce, does pizza need to be splattered with it? No. Does it make it better? Yes.

I believe that the iridium vs standard plug argument is a butt-dyno issue....I haven't read anything on here yet that definitively states that the iridium plugs improve the engine's performance significantly.
 

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Le So Cal Troll
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Though he died well before the 919, I would say Honda, just like nearly every other manufacturer uses standard plugs, because standard riders don't really care that much about their machines. But for those who want to give our prize possessions every extra goodie they can, even if being minimal improvement, there are parts/accessories that improve on the technology available at the time the bike was made.

With the mentality of; do motorcycles need to be improved from their basic design, you should apply for a job with Harley-Davidson.

It's like Hot Sauce, does pizza need to be splattered with it? No. Does it make it better? Yes.
so your telling me that The engineers wernt thinking of the necessary plug when making the 919? So that is why they just stuck an iridium plug in my CRF250x cus the figured why not? its a race motor so we gotta put an expensive plug in it even though it doesnt need it? I highly doubt that.

alls im saying is that if the 919 needed special fancy plugs to run properly it woulda come with it... exactly like if it needed 91 octane (like my crf250) they woulda specified 91 and not just the 87 regular.

Now if you find something that says your gonna make more power by going to fancy iridium plugs then hell ya go for it... but i dont think thats the case.
 

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What's a 919?
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alls im saying is that if the 919 needed special fancy plugs to run properly it woulda come with it... exactly like if it needed 91 octane (like my crf250) they woulda specified 91 and not just the 87 regular.

*sigh* this is boring. So now, we're beginning a 'does higher octane burn better' argument? lol I'll just go back to the standard rider analogy.

over...
 
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