Spark plugs

[hellfire]

Hey guy's what gap should have ngk iridium when you install new ones
The normal ones says in service manual
Any ideas?

[VTR Phoenix]

Spark plugs come pregapped. Gap I would imagine are same no matter what plug you use as long as it's the right plug for the bike.

[bald_pig]

Yup, Iridium plugs are pregapped and shouldn't be adjusted.

[roasty_duck]

as above, they shouldnt need adjusting but if they do.. 0.80-0.90 mm (0.031-0.035 in)

[tony.mon]

No, that's the recommended gap for non-iridium ones.
Iridium tipped plugs should not be adjusted, it's said that you damage the coatings on the earth arm by flexing it.
They're a use 'em up, throw away jobbie.

They last five thousand easily, but if you want to guarantee best performance I'd replace in three.
There's no time limit, so you don't have to replace every two years if you haven't done the mileage or anything like that.

Suggest you keep one known good old one as a spare in case you get a misfire for fault-finding purposes.

[roasty_duck]

odd, it says in the manual

Spark plug DPR9EVX-9 (NGK)
Spark plug gap 0.80-0.90 mm (0.031-0.035 in)

[tony.mon]

It certainly does. The manual similarly can't be trusted when it comes to cct replacement techniques...Treat it as a source of advice, not a bible.

It's your bike, I only offer advice and best practice based on experience, and sometimes, experience of the consequences of failure to follow best practice. I'm not telling anyone what they HAVE to do.

[vanstub]

like tony.mon says don't touch the gap on iridium or you feck em
he fitted some in mine a month ago all cool

[sirch345]

odd, it says in the manual

Spark plug DPR9EVX-9 (NGK)
Spark plug gap 0.80-0.90 mm (0.031-0.035 in)

The DPR9EXV-9 spark plugs are what was used before iridium ones were produced. The iridium spark plugs are DPR9EIX-9.
As others have said, I wouldn't try adjusting iridium spark plugs either,

Chris.

[E.Marquez]

Before taking a position on Gapping precious metal plug fine-wire spark plugs

In the late 1980s, when fine-wire spark plugs first appeared, installers used incorrect gap tools and procedures resulting in bent or broken-off firing electrodes. As a result, many people assumed that one cannot adjust the gap on a precious metal plug. While most NGK spark plugs are pre-gapped, there are instances where the gap requires modification. NGK recommends a wire-style or feeler gage gap tool, which can adjust the gap without prying against the center electrode. NGK also recommends adjusting the gap no more than +/- 0.008” from the preset gap.

https://www.ngksparkplugs.com/about-ngk ... park-plugs
Yes the DPR9EIX-9 was packaged pre gapped... by a machine, packaged by a mechanic, transported by human and machines, meaning it may or may not be gapped correctly when you take it out of the package.
Yes you should CHECK and confirm the gap before installing... If you care at all about doing it correctly.
Yes you can adjust the gap if needed... follow the recommendations above if the gap needs to be adjusted,,,and read between the lines.. If the new plug in your hand is not gapped correctly and needs to be adjusted more than more than +/- 0.008” from the preset gap...say because you dropped it, the package was crushed in transport,, the plug is not recommended for use.

[hellfire]

Thanks guy's real helpful