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post #1 of 7 (permalink) Old 03-18-2017, 01:38 PM Thread Starter
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Sparkplugs...

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.

Old:



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.
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post #2 of 7 (permalink) Old 03-18-2017, 02:33 PM
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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..
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post #3 of 7 (permalink) Old 03-18-2017, 03:37 PM
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Re: Sparkplugs...

I follow the service manual schedule. I don't mind spending money when it comes to my vehicles .
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post #4 of 7 (permalink) Old 03-18-2017, 05:01 PM
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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.
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post #5 of 7 (permalink) Old 03-18-2017, 06:58 PM
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Re: Sparkplugs...

I rather have a good-running engine than save a few dollars.
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post #6 of 7 (permalink) Old 03-18-2017, 08:06 PM
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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
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post #7 of 7 (permalink) Old 03-20-2017, 07:13 AM
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Re: Sparkplugs...

Quote:
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.
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