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Offline OneBlackDog

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why are my plugs filthy?
« on: May 30, 2020, 10:29 AM »
Greetings Team-V.

I finally got around to it...



This is a new bike for me - a 2015 (orange) with 20,000 km and (supposedly) logbook(ish) servicing at the dealer, the last service was at about 18k. The bloke I bought it off had a very clean garage/jet ski/4wd etc, but was more into dirt bikes - the V was his first (and only) road bike.

But it ran rough at low revs & small throttle openings - I put this down to lack of use. After an hours ride home & another hour out through the hills, plus fresh premium fuel (from a real servo, not a supermarket), it still ran rough.

Then it sat for 2+ months.

I started it this afternoon & ran like a... well, it didn't run well at all.

Idle was all over the place.
It would rev, but then fall back to a very low idle, even stalling.
Black smoke out of exhaust.

So, I'm confused - if the plugs are only 2k km old, why are they so fouled?

I will replace the plugs, but am concerned that there is a real problem causing this.

The air filter is ok, but will be replaced.



I'll have another look tomorrow for loose & split hoses, freely moving throttles etc.

Have any of you fine people got any ideas about what could be the cause of over-fueling & running rough?

Cheers, OBD

Offline uralrob

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Re: why are my plugs filthy?
« Reply #1 on: May 30, 2020, 12:34 PM »

 Those don't look like stock NGK CR9EIA-9  plugs.

 Otherwise:
 
 Dirty injector nozzles?

 Bad fuel - a shot of diesel in it?

 Might be worth emptying the tank, rinsing it with fresh fuel then refilling with fresh and adding a healthy dose of fuel injector cleaner after you've checked everything else and replaced the plugs with new oem.

 Rob.
Don't take Life too serious, it's not permanent.

Offline TowerMan

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Re: why are my plugs filthy?
« Reply #2 on: May 30, 2020, 03:54 PM »
Or lambda sensor playing up 🤔
Richard    :001: 
                   

2020 NVM now arranged for w/e 4th Sept - Details HERE :028:

Offline OneBlackDog

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Re: why are my plugs filthy?
« Reply #3 on: May 31, 2020, 12:42 AM »
 :028:

Thanks for the ideas.

The plugs are (unfortunately) the correct NGK IR CR9EIA-9.

All this electrickery... I'd much rather pull a carby apart  :007:


I checked the average fuel consumption on the trip computer; 8.6 km/litre  :172: that's less than half the distance per litre/more than double the fuel used than I was expecting. So I would guess that this has actually been a problem for a long time.

And I found this,



a vent hose from the left side throttle body that goes to the front, but I can't find where to connect it. And the end is split. Any clues?
I had a look at the underside of the air box - nothing, and we don't get the fuel evap canister. Next, off to find a parts diagram.
The covers on the 2 vacuum ports were in good condition & securely in place.

All the electrical connections that I could find were in good condition - firmly connected & with no moisture.

Do any of the sensors (inside air box, throttle position, are there any others?) have a reputation for failing? Are they able to be tested? Is there computer diagnostics to check?

At least it's cloudy & cold so I don't have to feel bad about not riding today.

Cheers, OBD

Offline OneBlackDog

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Re: why are my plugs filthy?
« Reply #4 on: May 31, 2020, 12:44 AM »
*Originally Posted by TowerMan [+]
Or lambda sensor playing up 🤔

Thanks,
 :157: What's a Lambda sensor? I found the one inside the airbox.

OBD

Offline OneBlackDog

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Re: why are my plugs filthy?
« Reply #5 on: May 31, 2020, 01:36 AM »
That vacuum hose - I figured it out! - goes from the left side throttle body to the Pressure Sensor

This is what it should look like



but my hose end was split & disconnected.

Could this have been the problem all along?

I'll get new plugs and air filter this week... and hope that it really was just something simple...  :008:

Offline uralrob

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Re: why are my plugs filthy?
« Reply #6 on: May 31, 2020, 01:52 AM »

 Lamda sensor is the O2 sensor screwed into the side of the muffler.

 Hope your split hose proves to be the cause.

 Let us know.

 Rob.
Don't take Life too serious, it's not permanent.

Offline OneBlackDog

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Re: why are my plugs filthy?
« Reply #7 on: May 31, 2020, 09:24 AM »
*Originally Posted by uralrob [+]
Lamda sensor is the O2 sensor screwed into the side of the muffler.

 Hope your split hose proves to be the cause.

 Let us know.

 Rob.

I hope it's the hose too, but it seems to good to be true.

Thanks

OBD

Offline OneBlackDog

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Re: why are my plugs filthy?
« Reply #8 on: Jul 13, 2020, 05:13 AM »
Wow, and backwards, woW

1. Where did all those weeks go?
2. It actually was the Inlet Air Pressure sensor, really, it was that simple. There wasn't enough hose to just cut off the split end - this may have been the whole problem, it pulled a bit tight on a right angle & split the hose - so I replaced it with a longer length of 3mm vacuum hose. Easy.

I've taken it for a 1.5 hour ride and it still has a few cobwebs to blow out, but now it runs, and is getting better with every kilometre (or mile if you're that way inclined).

Pro tips:

1. If you spray combustion chamber cleaner into the combustion chambers, cover the spark plug holes with a heavy rag before you turn the motor over;

2. The spark plug leads are numbered (well number 1 is - it has a white band with the number "1" printed on it), you have to work the other one out yourself. The spark plugs are also numbered - "1" & "2" and this is stamped into the valve cover, but black so very difficult to see. You have to match them up - 1 with 1 and the other with 2. Hint: 1 is on the left & 2 on the right, because, like, English is written left to right. It won't work if you don't.

Cheers






Offline Oldplodder

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Re: why are my plugs filthy?
« Reply #9 on: Jul 13, 2020, 12:14 PM »
*Originally Posted by OneBlackDog [+]

Pro tips:

1. If you spray combustion chamber cleaner into the combustion chambers, cover the spark plug holes with a heavy rag before you turn the motor over;

2. The spark plug leads are numbered (well number 1 is - it has a white band with the number "1" printed on it), you have to work the other one out yourself. The spark plugs are also numbered - "1" & "2" and this is stamped into the valve cover, but black so very difficult to see. You have to match them up - 1 with 1 and the other with 2. Hint: 1 is on the left & 2 on the right, because, like, English is written left to right. It won't work if you don't.

Cheers

Are there tips from experience by any chance?  :whistle: :whistle:

Dave T
Lord, Please make me into the person my dog thinks I am.