What conditions call for a different spark plug? - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 10 Old 09-21-2010, 08:54 AM Thread Starter
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What conditions call for a different spark plug?

Just curious on this one... I noticed on the factory parts diagrams that the stock plug for my vee is a CR8EK, though the parts diagram also listed a CR9EK and CR10EK as alternates. I was just curious under what operating conditions either of those other plugs would be recommended for our bikes? (I have no intention of changing them, I'm just curious is all...) I know with NGK's, the higher the number, the cooler the heat range, but it just has me curious about what kinds of symptoms or operating conditions would necessitate a cooler plug in our bikes?
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post #2 of 10 Old 09-21-2010, 09:50 AM
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A hotter plug is needed if excessive deposits are being formed. A colder plug is needed if the electrodes are prematurely wearing away. I have yet to hear of a V-Strom that needed a different heat range. Liquid cooled engines rarely do unless being used for racing.

Pat- 2007 DL650A was ridden to all 48 contiguous states. I didn't quite make it to 17,000 miles on the 2012 DL650A.
Nicknames I use to lessen typing, Vee = 2002-2012 DL1000s. Vee2=2014-2016 DL1000s. Wee = 2004-2011 DL650s. Glee = 2012-2016 DL650s
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post #3 of 10 Old 09-21-2010, 11:00 AM
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The theory goes that the more in town - stop & go you do, the hotter the plug. The more continuous high speed you do, the cooler the plug.

Some say bikes these days come from the factory with hotter than required, a hold over from the old days when engine tolerances weren't as tight and precise, and fouling was more common.

Some say a cooler plug might help with pre-detonation problem.

They say run the coldest plugs that are reliable and offer acceptable performance.

Course, all of this just might be BS too.

If and when I replace my plugs, I might try 1 range cooler.
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post #4 of 10 Old 09-22-2010, 04:03 AM
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Maybe

If you lived someplace where the speed limits were much higher, or there was little enforcement, and you ran your bike at nearly full throttle for, say, a half hour at a time, you'd maybe want to run a cooler plug. In normal use, no reason to run a colder plug. I rather suspect, in this age of electronic ignition and fuel injection that spark plug choice is much less critical than in the old days of carbs and points, when mixture was all over the map and ignition was a some-times thing. Wouldn't surprise me greatly to find that modern plugs also work better under a wider range of conditions, especially the premium plugs with small-wire electrodes. Probably one of those things that, if it's working, don't mess with it.
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post #5 of 10 Old 09-22-2010, 04:55 AM
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Correct. If you put a high compression piston in your DL, or shaved the head down - a cooler plug would be a good idea.

In the days when 2-strokes were around I used to change to a colder plug for "long" trips - AND it made a big difference 10-20kph on the top speed - which was only marginally above the legal limit - of course now I do 3 x what was a long trip then before breakfast on the DL .

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post #6 of 10 Old 09-22-2010, 09:50 AM
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Put in some iridiums and be done with it.

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post #7 of 10 Old 09-22-2010, 10:34 AM
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Extreme case -- no plugs = SUCK, SQUEEZE, BANG, BLOW! GO, DIESEL, GO!

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post #8 of 10 Old 09-22-2010, 11:05 AM
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Quote:
Originally Posted by Big B View Post
Put in some iridiums and be done with it.
I put them in 40.000 miles ago. I don't even think about them.

Pat- 2007 DL650A was ridden to all 48 contiguous states. I didn't quite make it to 17,000 miles on the 2012 DL650A.
Nicknames I use to lessen typing, Vee = 2002-2012 DL1000s. Vee2=2014-2016 DL1000s. Wee = 2004-2011 DL650s. Glee = 2012-2016 DL650s
See https://www.stromtrooper.com/general-...nicknames.html

Please vote in the poll on what Strom(s) you have at https://www.stromtrooper.com/informat...-you-have.html
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post #9 of 10 Old 09-22-2010, 08:11 PM Thread Starter
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Quote:
Originally Posted by Big B View Post
Put in some iridiums and be done with it.
This has no bearing on the topic at hand. And iridiums also come in various heat ranges. One would logically assume that similar logic would apply to using different heat ranges of iridium plugs as well.

I was simply asking the question regarding spark plug heat range selection, not soliciting a recommendation for what type of plug to run. That subject has been discussed ad-nauseum around here.
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post #10 of 10 Old 09-22-2010, 10:19 PM
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Quote:
Originally Posted by gijoecam View Post
This has no bearing on the topic at hand. And iridiums also come in various heat ranges. One would logically assume that similar logic would apply to using different heat ranges of iridium plugs as well.

I was simply asking the question regarding spark plug heat range selection, not soliciting a recommendation for what type of plug to run. That subject has been discussed ad-nauseum around here.
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