Plugs - Kawasaki Versys Forum
 
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post #1 of 19 (permalink) Old 08-06-2009, 04:26 PM Thread Starter
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Plugs

This is most certainly a question for more experienced owners than I am. I have an '08 Versys that I purchased with 1800 miles on it. It seems that the previous owner maintained it very well for it's break-in period. I'm having the tank, fenders, etc. painted. Here's my question:

While the tank is off, should I put new/improved plugs in it? It's certainly not necessary since the bike is so new, but if there are aftermarket plugs that will improve performance and last longer, I'm thinking I should go ahead and put them in now. Thanks for your advice.
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post #2 of 19 (permalink) Old 08-06-2009, 04:37 PM
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If you just like to spend money, go ahead but there is absolutely nothing to be gained by changing the plugs with no more miles than you have on the bike. If it's running poorly, the plugs are the first thing to check. Otherwise, ride the thing.

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post #3 of 19 (permalink) Old 08-06-2009, 06:33 PM
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They're iridium plugs, not $1.50 moped plugs.
I wouldn't replace them until at least the recommended maint. interval, 7500 miles.
Some people have reported loss of fuel mileage and power earlier than that, but others have gone far longer without replacing the plugs.
I'm at about 10,000 miles myself and will be replacing the plugs in a week or so.
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post #4 of 19 (permalink) Old 08-06-2009, 07:03 PM
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Let us know. . . .

Somebody has to go first. Tell us how things work out.


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post #5 of 19 (permalink) Old 08-07-2009, 11:15 AM
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7500 miles sounds like they want to drum up business for the dealers. It's a good chunk of change to get it done for the average guy. And it's not really necessary. I'd expect at least 30,000 out of a set. My truck goes 50,000.

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post #6 of 19 (permalink) Old 08-07-2009, 11:37 AM
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Alright, at the risk of looking like a total dork:

7,500 Miles * 4700 Revolutions / minute * 1 minute / mile * 1spark/1revolution= 32,250,000 Sparks

50,000 miles * 1500 Revolutions / minute * 1 minute / mile * 1spark/ 2revolution = 37,500,000 Sparks

The assumptions here are that most of the mileage (not hours) is done in top gear doing something like 60 mph.
I'm figuring 4700 RPM for the Versys and 1500 for your truck, just pulled those out my arse. At 60mph thats 1 mile per minute, so the RPMinute = the RPMile
Im also counting on the versys firing every revolution (including the exhaust stroke) where most 4 stroke ignition systems will fire every other revolution (only at the end of the compression stroke). I think this was established in a previous thread.

Anyway, unless I'm wicked mistaken about one of those assumptions then 50,000 miles in your truck is not that many more actual spark events than 7,500 miles on the Versys. In terms of spark plug erosion they are pretty comparable.

Anybody wanna check my maf?
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post #7 of 19 (permalink) Old 08-07-2009, 01:00 PM
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Quote:
Originally Posted by Shatrat View Post
Alright, at the risk of looking like a total dork:

7,500 Miles * 4700 Revolutions / minute * 1 minute / mile * 1spark/1revolution= 32,250,000 Sparks

50,000 miles * 1500 Revolutions / minute * 1 minute / mile * 1spark/ 2revolution = 37,500,000 Sparks

The assumptions here are that most of the mileage (not hours) is done in top gear doing something like 60 mph.
I'm figuring 4700 RPM for the Versys and 1500 for your truck, just pulled those out my arse. At 60mph thats 1 mile per minute, so the RPMinute = the RPMile
Im also counting on the versys firing every revolution (including the exhaust stroke) where most 4 stroke ignition systems will fire every other revolution (only at the end of the compression stroke). I think this was established in a previous thread.

Anyway, unless I'm wicked mistaken about one of those assumptions then 50,000 miles in your truck is not that many more actual spark events than 7,500 miles on the Versys. In terms of spark plug erosion they are pretty comparable.

Anybody wanna check my maf?

I'm not checking anything, instead I'll just go ride .

My head hurts just reading all that stuff.

Moon Dust Gray Versys, with lots of farkles.

Vlast

P.S. I bought my Versys to support my photography hobby.


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post #8 of 19 (permalink) Old 08-07-2009, 02:05 PM
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Quote:
Originally Posted by Shatrat View Post
Alright, at the risk of looking like a total dork:

7,500 Miles * 4700 Revolutions / minute * 1 minute / mile * 1spark/1revolution= 32,250,000 Sparks

50,000 miles * 1500 Revolutions / minute * 1 minute / mile * 1spark/ 2revolution = 37,500,000 Sparks

The assumptions here are that most of the mileage (not hours) is done in top gear doing something like 60 mph.
I'm figuring 4700 RPM for the Versys and 1500 for your truck, just pulled those out my arse. At 60mph thats 1 mile per minute, so the RPMinute = the RPMile
Im also counting on the versys firing every revolution (including the exhaust stroke) where most 4 stroke ignition systems will fire every other revolution (only at the end of the compression stroke). I think this was established in a previous thread.

Anyway, unless I'm wicked mistaken about one of those assumptions then 50,000 miles in your truck is not that many more actual spark events than 7,500 miles on the Versys. In terms of spark plug erosion they are pretty comparable.

Anybody wanna check my maf?
I have no credit here to sustanciate your post here. But damn, if it doesn't sound like a true and solid argument.
By the way - you should probably get out and ride more.


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post #9 of 19 (permalink) Old 08-07-2009, 03:29 PM
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Dude . . . .

Quote:
Originally Posted by ttpete View Post
7500 miles sounds like they want to drum up business for the dealers. It's a good chunk of change to get it done for the average guy. And it's not really necessary. I'd expect at least 30,000 out of a set. My truck goes 50,000.
O.K. your truck probably runs on 6 or 8 cylinders and fires a spark on each cylinder a lot less than our beloved 2 cylinder Com padre. I got away with 12K miles before I noticed a performance difference. Recommended from the sop book is 9K Miles.

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post #10 of 19 (permalink) Old 08-07-2009, 03:30 PM
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Quote:
Originally Posted by Shatrat View Post
Alright, at the risk of looking like a total dork:

7,500 Miles * 4700 Revolutions / minute * 1 minute / mile * 1spark/1revolution= 32,250,000 Sparks

50,000 miles * 1500 Revolutions / minute * 1 minute / mile * 1spark/ 2revolution = 37,500,000 Sparks

The assumptions here are that most of the mileage (not hours) is done in top gear doing something like 60 mph.
I'm figuring 4700 RPM for the Versys and 1500 for your truck, just pulled those out my arse. At 60mph thats 1 mile per minute, so the RPMinute = the RPMile
Im also counting on the versys firing every revolution (including the exhaust stroke) where most 4 stroke ignition systems will fire every other revolution (only at the end of the compression stroke). I think this was established in a previous thread.

Anyway, unless I'm wicked mistaken about one of those assumptions then 50,000 miles in your truck is not that many more actual spark events than 7,500 miles on the Versys. In terms of spark plug erosion they are pretty comparable.

Anybody wanna check my maf?
I think your math is skewed by unrealistic data. Whose truck runs 55 @ 1500 rpm?? That's barely above idle. Of course, I haven't driven a V-8 in a LOOONG time, so correct me if I'm wrong...






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post #11 of 19 (permalink) Old 08-07-2009, 03:31 PM
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Quote:
Originally Posted by bornrider View Post
O.K. your truck probably runs on 6 or 8 cylinders and fires a spark on each cylinder a lot less than our beloved 2 cylinder Com padre. I got away with 12K miles before I noticed a performance difference. Recommended from the sop book is 9K Miles.
Actually, it's a V-10....

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post #12 of 19 (permalink) Old 08-07-2009, 07:08 PM
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I ran my Toyota T-100 v-6 for 175,000 miles on the stock plugs and front brakes. Sold it at 300,000 with stock rear brakes. Gas mileage never changed, even after new plugs. My 2001 Yamaha Rodstar[V-Twin] still has stock plugs at 36,000 miles with no problems.

81 Honda CB750F with Jupiter sidecar, 82 Honda CB750F, 86 Yamaha Radian, 87 BMW K100RS, 2002 Honda XR 200R, 2007 Suzuki Bandit 1250, 2009 Green Versys, 2010 Kawasaki Vukcan 900 Custom
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post #13 of 19 (permalink) Old 08-07-2009, 07:10 PM
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My 2 cents. If the tank and other body parts are already off the bike for paint it would be prudent to replace the plugs. Why invest big $$$ for cosmetics and not take the opportunity to replace the sparks. Replace plugs now and start fresh and avoid risking damaging your paint job by removing the tank in the near future to access the plugs.
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post #14 of 19 (permalink) Old 08-08-2009, 10:54 AM
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I replaced my plugs around 20k miles, as I had the tank off to clean the airfilter.

A complete waste of time and money, plugs I removed were like new and would have done another 20k miles. I posted a pic somewhere on this board of what they looked like---new.

The airfilter on the other hand was filthy and would have started having an effect on mileage and performance before much longer.

Machog


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post #15 of 19 (permalink) Old 08-08-2009, 02:34 PM
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Quote:
Originally Posted by Shatrat View Post
Anyway, unless I'm wicked mistaken about one of those assumptions then 50,000 miles in your truck is not that many more actual spark events than 7,500 miles on the Versys. In terms of spark plug erosion they are pretty comparable.

Anybody wanna check my maf?
There is a significant difference in RPM a sporty motorcycle engine spins vs. a large V-8/10, which you could probably say is 3X, so that would be a reasonable assumption, if a truck can go 100K on the spark plugs, your bike should be able to do 30K on same quality plugs.

The plugs on my FI bikes always look good at 15K, there is no reason to change plugs at 7.5K, much less so when you use top quality plugs as Kawasaki specifies for the Versys.

Gustavo


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post #16 of 19 (permalink) Old 08-08-2009, 05:32 PM
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The difference in RPM is closer to twice as much for the Versys compared to the large V8. The Versys firing at every TDC makes it about 4 times as many sparks compared to a car or truck. A car's small 4 banger also calls for replacement of its iridium spark plugs at every 100000 to 120000 miles... I just replaced my NGK IX iridium plugs in my Toyota 1.8 with 90000 miles on them, and the ground electrode which is not iridium was quite worn down and rounded off, increasing the gap from 1.1 to 1.25 mm.

To answer the original question; if you'd like to upgrade your plugs already while you're in there, some already switched to Denso's IU27(D/A) with 0.4 mm diameter iridium center electrode and inconel taper cut ground electrode, instead of NGK's 0.7 mm iridium center electrode and nickel taper cut ground electrode.
http://www.kawasakiversys.com/forums...ighlight=denso

Last edited by invader; 08-08-2009 at 05:49 PM.
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post #17 of 19 (permalink) Old 08-09-2009, 04:46 PM Thread Starter
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Thanks for the feedback, folks! I've learned a lot. I'm going to let these plugs run for a while. Although taking the tank off wasn't fun, I have an extra set of hands here because my wife also rides and maintains her bikes, so when it's time, I won't sweat having to get back in there to change them.

Best wishes!!
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post #18 of 19 (permalink) Old 08-09-2009, 08:56 PM
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When you decide to get plugs, check Amazon.com which has OEM iridium plugs for under $8 each.


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post #19 of 19 (permalink) Old 08-10-2009, 06:45 AM
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O'reilly autoparts sells the OEMs for 8.49 and you don't have to pay shipping.
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