Spark plugs - MVAgusta.net
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post #1 of 19 (permalink) Old 08-25-2019, 03:35 PM Thread Starter
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Spark plugs

Anyone had to change their plugs on their engine? NGK lists the life span of 100k miles! I find this highly unlikely. MV says replace @ 18k mi

Put in the part number from MV into the NGK website and you'll see that the plug for our engine is the only listed application for the plug. So why would NGK list 100k mile service life, when the plug was specifically made for our engine and no other bike. (At least according to their website)

My bike is emitting some of the same symptoms of warn out plugs. On my CBR I changed to a colder heat range @10k mi.

I'm going to try a set of colder plugs 1 heat range cooler. Se if they last longer...

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post #2 of 19 (permalink) Old 08-25-2019, 04:28 PM
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Iridium plugs will last 100k in cars...so why not bikes? Probably will IF your engine is tuned and running as clean as a modern car engine.

Not many bike engines run that clean.

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post #3 of 19 (permalink) Old 08-26-2019, 01:52 AM Thread Starter
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Iridium plugs will last 100k in cars...so why not bikes? Probably will IF your engine is tuned and running a lean as a modern car engine.



Not many bike engines run that clean.
I suppose I contribute it to the heat. Leaner engines run hotter. Hotter plugs are better for cooler weather (easy starts) but a colder plug could make it last longer since it has less heat exposure around the core.

I know this isn't exactly right but i like to think of it as the hotter the plug the more the tip extends.(insert joke here) The colder the plug the less its protruded.

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post #4 of 19 (permalink) Old 08-26-2019, 02:01 AM Thread Starter
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In case anyone wants to do the same thing I am going with a CR8EIB9.

Good news on the cost as well they are cheaper than the 9's by a couple bucks each.

I will report back when I have some miles on them and if it solves my issues.

Keep in mind I ride in 100+ deg F every day so this may not be right for everyone. Ie: hard starting in very cold temps.

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post #5 of 19 (permalink) Old 08-26-2019, 06:52 AM
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The spark plug heat range is not a factor in starting and ambient temperatures. Unless the heat range is too cold and therefor fouling from deposits on the insulator.

Combustion temperature is what drives spark plug heat range selection, not the air temperature you ride in.

A plug that is too hot will damage your engine. A plug that is too cold will fail from its inability to clean itself from combustion deposits (fouling).

The engineers that designed your engine chose a spark plug heat range based on the operating temperatures inside the combustion chamber.

Look carefully at the spark plugs that you remove from your engine. If the insulator is black or very dark in color then a hotter plug may be beneficial.

A spark pug which is running too hot will also have a shorter life span, besides potential engine damage.

Good luck with your experiment. Just out of curiosity, what did the plugs you removed look like? Care to post a photo?
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post #6 of 19 (permalink) Old 08-26-2019, 07:00 AM
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I would love to ride a bike 100,000 miles just to test NGK's statement. I am no engineering/tuning authority, but it just seems so implausible to me. (and I do note Ed's comment above)

As Judge Judy says: 'If something sounds too good to be true, it probably is'!!

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post #7 of 19 (permalink) Old 08-26-2019, 10:18 AM
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Quote:
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Anyone had to change their plugs on their engine?
I did it last year on 30000km, all day job, didn't want to disconnect tank so i lifted it. Airbox and all sensors needs to be removed, replaced with original CR9EIB9.
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post #8 of 19 (permalink) Old 08-26-2019, 10:21 AM
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Just out of curiosity, what did the plugs you removed look like? Care to post a photo?
Here is after 30000km of "veloce" tempo
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post #9 of 19 (permalink) Old 08-26-2019, 02:51 PM
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Here is after 30000km of "veloce" tempo
Looks a bit worn, but the color is good !! Probably could have closed the gap back down to spec and gone another 30K !!
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post #10 of 19 (permalink) Old 08-26-2019, 09:27 PM Thread Starter
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Here is after 30000km of "veloce" tempo
Cool thanks for sharing.

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