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

Hassnen

Hassnen
New member
New member
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 on Mon Sep 02, 2019 11:25 am

92KK 84WW Olaf

92KK 84WW Olaf
Life time member
Life time member
What plugs are you using? They do look very white.


__________________________________________________
1992 K100LT 0193214 Bertha Alaska Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 58,645 now 100,380 miles
1983 K100RS 0011171 Fricka 29,495 miles Damn K Pox Its a Bat outta Hell No 33,600 miles
    

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

Point-Seven-five

Point-Seven-five
Life time member
Life time member
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:
1994 K75RT
1991 K100RS
1988 K100RS SE

Past:
1994 BMW K75S
1992 BMW K100RS
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 on 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%OWhite spark plugs Au-log10

"redframe" rs "bitsa"  with many contributions from the k100 community ,,with many thanks
    

5Back to top Go down   White spark plugs Empty Re: White spark plugs on 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 (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

6Back to top Go down   White spark plugs Empty Re: White spark plugs on 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 on 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%OWhite spark plugs Au-log10

"redframe" rs "bitsa"  with many contributions from the k100 community ,,with many thanks
    

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

RicK G

RicK G
VIP
VIP
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 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

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

92KK 84WW Olaf

92KK 84WW Olaf
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 Alaska Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 58,645 now 100,380 miles
1983 K100RS 0011171 Fricka 29,495 miles Damn K Pox Its a Bat outta Hell No 33,600 miles
    

10Back to top Go down   White spark plugs Empty Re: White spark plugs on 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 73,000 miles
White spark plugs Usa-lo10
    

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