Spark plug-little explanation

[DimmniBurek]

Hello, I drive NSR 99' electronically restricted, at about 11000km I have had to replace spark plug, now its BR9EIX, and the it worked just fine, but now (16500km) it started to work roughly and today it almost died, the bike was working awful, now I've unscrewed it and this is what it was like....
I want to know why does this happen? Too much fuel, too much air? The airbox is opened(without cover)
https://www.mobisux.com/album/data/500/32930IMG_9481.jpg
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[instigator]

That looks......oily.

Compare it to this and tell us what it looks like:

https://www.spark-plugs.co.uk/pages/technical/diagnosis.htm



Try cleaning it up a little, sand it down a little to clean it up and try it again. I take it the spacing is correct, yes?

[Tim_H]

I'm new to bikes, but ok with car engines. I'd say that if the electrode is burnt away like that, that it's running too lean. ie. not enough fuel.

As you say you are running without an air filter, then this will make the mixture lean, and therefore the engine will run hot (and eventually destroy itself).

Either map more fuel in, or put the air box back on.

[DimmniBurek]

So how do I map more fuel in? Where do I adjust this on Dellorto 28(original NSR, I think PHBB)
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[baldy]

isn't that what happens when the piston hits the sparkplug?
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[Guest]

5k out of a plug on a little stroker isn't too bad I'd have thought. If the engine/pipe is standard fit a new plug of the recommended grade and put the air box lid back on.

[DimmniBurek]

The spark plug is good enough, even better than that one which says in the manual, but looks like too much air in the mixture, I would fit the lid back on to see the difference

Where do I open more of the gas on the carb?

Sorry for bad english
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[alains]

look here and compare
https://www.dansmc.com/Spark_Plugs/Spark_Plugs_catalog.html
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[Ichy]

colour of plug looks ok, just needs cleaning or changing.

[fuzz]

They should be replaced every 2500 to 3000 miles, so 5500km is a good lifespan. With the white appearance on the electrodes I'd say it is ready for replacement.
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[bish777]

that sparkplug has BEEN HIT BY THE PISTON!

get the engine looked at ASAP!

otherwise the mixture looks fine.
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GSXR1100J

[DimmniBurek]

[Guest]

[DimmniBurek]

The plug is good, the first one last 11000km, and one day it just wouldn't work, so I've changed it! No one of my friends changes plugs so often as 6000km! I have changed it because was some Bosna Super in it->not very good plugs and it suddenly died!
In NSR manual it says to clean it every 4000km, so I think changin at 6000km is crap

Where do I adjust to map more gas in?
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[SoND]

To let more fuel in you need to change the main jet in the carb
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[bish777]

I think that plug has been impacted. look at the anode, see how bent up it is?

the other possibility, is your running far too lean and have gotten a detonation.

Either way that engine needs work.
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GSXR1100J

[DimmniBurek]

So tell me how could it be impacted? It worked 6000km and it works now-after the cleaning, so?
This is the same type of plug that it says in bikes manual, its BR9EV, in the manual says BR9ECS or BR10ECS, alains told me to buy EV or EIX...
I would put that cover back on
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[alains]

clean it and re-fit , it will work perfectly
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[DimmniBurek]

I'm just doing it, but firstly I want to see if it would improve acceleration or not
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[alains]

this is not the main point (it will improve smoothness) but watch carrefully your fuel consumption , surely you will spare 1/2 to 3/4 L on a full tank !
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[bish777]

[DimmniBurek]

I ain't doing this again! The sound is awful as hell, acceleration is a bit worse than with the cover, so which main jet shuold i get?
https://www.mobisux.com/album/data/500/32930with.avi
https://www.mobisux.com/album/data/500/32930without.avi
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[alains]

main 138 slow 42 power 65
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[DimmniBurek]

Can you tell me the approx. cost of all 3 jets? € will be fine
Is there any difference in acceleration or top speed after switching the jets?

Thanks Guys
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[alains]

to be lean at high revs could break the piston and sometimes more . the under jetting was done as the bikes were restricted . so if you de-restrict your engine you must upjet avoiding when you go over 9500 rpm any problem . these jets cost £2.95 ex vat and are delivered in the uk under 48h , under 5 days for europe
https://www.dellorto.co.uk , mail to mattew : sales@dellorto.co.uk
carburettor 28PHBH/FD
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