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K100-forum.com » Technical, repair and troubleshooting » Engine and transmission » Rich runnin brick

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1Back to top Go down   Rich runnin brick Empty Rich runnin brick Wed Jan 03, 2024 5:49 pm

VERN

VERN
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My 85 K100 is running rich and I've heard the water temp sensor may be the culprit.  Truth is it's all original with 80k hauling a sidecar... any thoughts... Shocked

    

2Back to top Go down   Rich runnin brick Empty Re: Rich runnin brick Wed Jan 03, 2024 6:29 pm

jbt

jbt
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How do you know it's running rich?
Since fuel is unleaded, you can't read the coloration of the plugs to make an inference about how rich is the air-fuel ratio.
It was the lead oxydes resulting from the combustion of the lead dissolved into the leaded fuel that were forming a thin brown layer on the plugs when the AFR was too rich.
Nowadays, the brown coloration of the plug is only the proof that there's a excess of oil into the chamber.


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Let us enjoy the transient delight
That fills our fairest day.
    

3Back to top Go down   Rich runnin brick Empty Re: Rich runnin brick Thu Jan 04, 2024 12:51 am

Laitch

Laitch
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Tell us the symptoms, Vern. MPGs dropping, hard starting, fuel leaking from the muffler joint, acceleration not right? Give us an idea of which fuel system and ignition items have been replaced.


__________________________________________________
1995 K75 90,000 miles
    

4Back to top Go down   Rich runnin brick Empty Re: Rich runnin brick Thu Jan 04, 2024 6:31 am

92KK 84WW Olaf

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There are many other things that can cause running rich or make it feel like its running rich so go with what Laitch has posted to narrow it down.

Bad fuel pressure regulator.
Broken vacuum pipes [early Ks with bolted tanks have two]
Broken crankcase pipe [ Z pipe] can make if feel lik its running rich.
Bad MAF [Air Flow Meter]
Bad air filter [rare]
Bad injectors [one or more stuck open or sticking]
Bad electrical connections.

I now regard vacuum pipes, vacuum caps, Z pipe as service items and dont leave them in more than 3 years. They are cheap and easy enough to replace but really mess things up when they go wrong.


__________________________________________________
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 51,800 miles.
1983 K100RS 0004449 Odette R100 colours 58,000 miles. Sprint fairing now 63,390 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
    

5Back to top Go down   Rich runnin brick Empty Thanks Olaf Thu Jan 04, 2024 11:04 am

VERN

VERN
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I'll start with the rubber parts first. Sound right? Shocked

    

6Back to top Go down   Rich runnin brick Empty Re: Rich runnin brick Thu Jan 04, 2024 12:10 pm

Point-Seven-five

Point-Seven-five
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VERN wrote:I'll start with the rubber parts first. Sound right? Shocked
I would say so.  Then check the engine water temperature sensor.  That seems to be the main source of bad fuel mixes.  

It also wouldn't hurt to throw some injector cleaner in the tank, especially if the bike has been sitting idle for an extended time.


__________________________________________________
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
    

7Back to top Go down   Rich runnin brick Empty Re: Rich runnin brick Fri Jan 05, 2024 12:13 pm

VERN

VERN
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I have poor mpg, but I do flog it within an inch of it's life. It seems to like it that way Very Happy

    

8Back to top Go down   Rich runnin brick Empty Re: Rich runnin brick Fri Jan 05, 2024 2:15 pm

Laitch

Laitch
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VERN wrote:I have poor mpg, but I do flog it within an inch of it's life. It seems to like it that way Very Happy
That would be more likely within an inch of your life, Vern. Laughing  It doesn't seem to like that way entirely though, does it? How are you getting along with the checklist?


__________________________________________________
1995 K75 90,000 miles
    

9Back to top Go down   Rich runnin brick Empty Brrrr Fri Jan 05, 2024 2:22 pm

VERN

VERN
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It's cold in my garage cold

    

10Back to top Go down   Rich runnin brick Empty Re: Rich runnin brick Fri Jan 05, 2024 2:38 pm

Laitch

Laitch
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Life time member
Rich runnin brick 2714 


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1995 K75 90,000 miles
    

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