Sparkplugs... - Suzuki GSX-R Motorcycle Forums
LinkBack Thread Tools Display Modes
post #1 of 7 (permalink) Old 03-18-2017, 01:38 PM Thread Starter
Provisional Novice
Süsser Tod's Avatar
Join Date: Dec 2013
Location: Mexico City
Motorcycle: GSX-R 750, Versys 650
Posts: 104

It was time for the 7500 mile service on my 750, so I'm taking a look at the schedule and...

Sparkplug time!

LOL, que?

Lets see... Air and oil filters are good for 11250 miles, but the plugs, iridium plugs at that, are only good for 7500 miles?

Same sparkplugs as in my Krap-a-saki Versys; on that bike I replaced them at 38,000 miles... When I was replacing the head, after the thermostat failed and the head warped to hell. Might as well throw in a couple new plugs when you're at this point, right?

But how did the plugs look? They were worn, definitely, the ground electrode (cathode) is nothing special, only the electrode (anode) is coated in iridium. In the picture is noticeable how the cathode is worn but the anode is like new.



Next time I won't wait 38,000 miles to do them, but 7500 miles is just a waste of money. I plan on replacing them at 22500; I'll report back whenever I get that far on my 750, that is, if I get there, bike ADD is hard to resist. In the Versys I'll get there soon, it's my commuter and tourer, but I doubt anyone here cares about the Krap-a-saki, no to mention that engine revs slower so it puts less wear on the plugs.

Last edited by Süsser Tod; 03-18-2017 at 01:45 PM.
Süsser Tod is offline  
Sponsored Links
post #2 of 7 (permalink) Old 03-18-2017, 02:33 PM
Join Date: Jun 2004
Location: British Columbia, Canada
Motorcycle: gsxr k7 1000
Posts: 1,103
Re: Sparkplugs...

I change the plugs in my slowzuki at ~30000+ miles, dont notice any difference in performance or fuel consumption..
Any sooner is just a waste of $$.. JMHO..
john kinzell is offline  
post #3 of 7 (permalink) Old 03-18-2017, 03:37 PM
Motionelco's Avatar
Join Date: Apr 2012
Location: California
Motorcycle: 2011 gsxr750
Posts: 2,682
Re: Sparkplugs...

I follow the service manual schedule. I don't mind spending money when it comes to my vehicles .
Motionelco is offline  
post #4 of 7 (permalink) Old 03-18-2017, 05:01 PM
Not the powers that be, not even close.
600k2's Avatar
Join Date: Jun 2009
Motorcycle: 600k2
Posts: 22,963
Re: Sparkplugs...

I always thought it was because the engine rev's higher. In the same amount of miles the plugs in your 750 will fire a lot more times.
600k2 is offline  
post #5 of 7 (permalink) Old 03-18-2017, 06:58 PM
Likes Diiiiiiiiiiiiiiicks
Just_Nick's Avatar
Join Date: Jul 2009
Motorcycle: 2006 GSXR "250"
Posts: 2,035
Re: Sparkplugs...

I rather have a good-running engine than save a few dollars.
Just_Nick is online now  
post #6 of 7 (permalink) Old 03-18-2017, 08:06 PM
maniac1886's Avatar
Join Date: Jan 2016
Location: Flint, Mi
Posts: 1,410
Re: Sparkplugs...

Shit, I change my plugs yearly. What is it, like $20.00? I throw a new set of plugs in with my pre-spring oil change. Same with oil. Every spring she gets new plugs and oil/oil filter. Air filter is usually every other year unless it's dirty enough to warrant a change
maniac1886 is online now  
post #7 of 7 (permalink) Old 03-20-2017, 07:13 AM
I know things... A lot of things.
Join Date: Feb 2015
Motorcycle: GSXR 750 K4
Posts: 2,186
Re: Sparkplugs...

Originally Posted by 600k2 View Post
I always thought it was because the engine rev's higher. In the same amount of miles the plugs in your 750 will fire a lot more times.
Another consequence of high speed engines, is that there's less time for combustion when you're anywhere near the power band. I suppose this makes spark quality more crucial. When I got my K4 750, I soon noticed (well not that soon, but eventually) that it wouldn't reach the limiter in anything past 2nd or 3rd gear and would top out at about 240km/h or so. I was worried that there was something seriously wrong with the engine, but after replacing plugs (without any other change at the same time, as far as I recall), everything was back to normal. I noticed no change when riding around town at low speeds/accelerations, but at higher speeds the difference was both noticeable and measurable.

Note that the difference in top speed (say 240km/h vs. 280km/h indicated) probably equated to a loss of 50 bhp or so and that the bike only had 26000 miles on the clock back then.
dpapavas is offline  
Sponsored Links

Quick Reply

Register Now

In order to be able to post messages on the Suzuki GSX-R Motorcycle Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome