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1Back to top Go down   White spark plugs Empty White spark plugs Mon Sep 02, 2019 7:40 am

Hassnen

Hassnen
New member
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Hi,

I just changed spark plugs in my K100 -84 and as i took a look at them after one day of running they all looked like this:
 White spark plugs Tzinds10

I'm fairly new to injection bikes and new to my k100 so I'm not sure which screw I need to adjust to adjust the mixture. I'm used to simple carburetors Smile 

Any pro tips? 

Best regards,
Jens

    

2Back to top Go down   White spark plugs Empty Re: White spark plugs Mon Sep 02, 2019 11:25 am

92KK 84WW Olaf

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What plugs are you using? They do look very white.


__________________________________________________
1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011157 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 58,200 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 48,061 miles.
1983 K100RS 0004449 Odette R100 colours 58,000 miles. Sprint fairing now 61,190 miles

Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500
    

3Back to top Go down   White spark plugs Empty Re: White spark plugs Mon Sep 02, 2019 1:50 pm

Point-Seven-five

Point-Seven-five
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Looks like an NGK D8EA which, if I remember correctly, is one step colder than the specified plug. 

Are all the plugs like that?  Most likely you have a weak fuel delivery caused by low pressure from a bad regulator, weak pump, or plugged fuel filter.  It's possible, but unlikely that the ignition timing with the Hall Sensors is way off as well.

Check all those items, and if the problem persists, it may be necessary to go into the MAF sensor and possibly the engine control module.

How is the engine running?  I would expect it to be pinging a lot, and having problems coming off idle if it even idles at all.  No power at high rpms.

If it is only on one cylinder, you probably have a massive air leak at the throttle body rubber bushings.


__________________________________________________
Present: 1991 K100RS "Moby Brick Too"
 
Past:
1994 K75RT "Ilsa, She Wolf of the SS"
1988 K100RS SE "Special Ed"
1994 K75S "Cheetos"
1992 K100RS "Moby Brick" R.I.P.
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

4Back to top Go down   White spark plugs Empty Re: White spark plugs Tue Sep 03, 2019 2:20 am

charlie99

charlie99
VIP
VIP
could I add,    it just could be a sticky fuel injector (that needs a good service ).... if the others are  a different colour that would confirm that fuel delivery is ok
we have seen this kind of thing before
but not to discount leaking rubbers from head to throttle bodies ...or even injector o rings


hope that helps


__________________________________________________
cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
1987 k100rs ########   "Red"  - (red sports rs TWB style )
1989 K100rt #009637   "Black Betty"  (naked rt ala Nigel , now sporting an rs main fairing )
    

5Back to top Go down   White spark plugs Empty Re: White spark plugs Tue Sep 03, 2019 2:40 am

duck

duck
Life time member
Life time member
Not to get political or anything but it's obviously Swedish white privilege.

(I'm about 60% Swedish.)


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

6Back to top Go down   White spark plugs Empty Re: White spark plugs Tue Sep 03, 2019 6:39 am

Hassnen

Hassnen
New member
New member
Point-Seven-five wrote:Looks like an NGK D8EA which, if I remember correctly, is one step colder than the specified plug. 

Are all the plugs like that?  Most likely you have a weak fuel delivery caused by low pressure from a bad regulator, weak pump, or plugged fuel filter.  It's possible, but unlikely that the ignition timing with the Hall Sensors is way off as well.

Check all those items, and if the problem persists, it may be necessary to go into the MAF sensor and possibly the engine control module.

How is the engine running?  I would expect it to be pinging a lot, and having problems coming off idle if it even idles at all.  No power at high rpms.

If it is only on one cylinder, you probably have a massive air leak at the throttle body rubber bushings.

Yes, they are NGK D8EA. They came with the bike so I put them in brand new. 

All plugs are the same. I have a new filter and will do a change later this week. Might as well look at the pump then.   

The engine is running OK but with hesitation or even dying sometimes if I pull full gas right off idle. But it idles kind of OK.  

I have just stripped the bike down and built it back up again with new rubber hoses so it shouldn't be leaking air.

    

7Back to top Go down   White spark plugs Empty Re: White spark plugs Tue Sep 03, 2019 8:33 am

charlie99

charlie99
VIP
VIP
yes check the pump output pressure on the fuel rail , which will indicate the pressure regulator operation ''  with out vacuum line attached ...just under 3 bar ...attached  pulsing down to 2.5bar  or something like that

today was chasing a similar issue with the engine running seems like water in fuel ...turns out the pump was dying , drawing 5 + amps after just a minute of operation (unloaded )   the tank connector was showing melted plastic around the connection ...fuel pump replaced ...testing tomorrow


__________________________________________________
cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
1987 k100rs ########   "Red"  - (red sports rs TWB style )
1989 K100rt #009637   "Black Betty"  (naked rt ala Nigel , now sporting an rs main fairing )
    

8Back to top Go down   White spark plugs Empty Re: White spark plugs Tue Sep 03, 2019 9:17 am

Rick G

Rick G
admin
admin
Put D7EAs in and give it a 50km run then see what the plugs are like.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1999 K1100 LT with a Big Block 1200
    

9Back to top Go down   White spark plugs Empty Re: White spark plugs Tue Sep 03, 2019 11:30 am

92KK 84WW Olaf

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Life time member
Life time member
I used mostly D8EA as they are widely available locally. Then got D7EA and did not notice any difference at all. Reminded me of my two strokes and I always ran a grade colder than recommended and no issues. I still do lots of long high speed runs and thus tend to stay a grade colder.


__________________________________________________
1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011157 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 58,200 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 48,061 miles.
1983 K100RS 0004449 Odette R100 colours 58,000 miles. Sprint fairing now 61,190 miles

Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500
    

10Back to top Go down   White spark plugs Empty Re: White spark plugs Tue Sep 03, 2019 4:13 pm

Laitch

Laitch
Life time member
Life time member
Hassnen wrote:. . . they are NGK D8EA. They came with the bike so I put them in brand new.
Do the ends of these spark plugs have the same type of wire connections as the spark plugs they replaced? They should. If they didn't, that's ikely the source of the problem. The HT leads must fit firmly.

Did you check their electrode gaps before you installed them?


__________________________________________________
1995 K75 90,000 miles
    

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