BMW K bikes (Bricks)

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1Back to top Go down    Fitting fuel injector on Wed Feb 22, 2017 6:35 pm

Peterk100rs

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Hi
Im Peter and bought my first BMW K100rs a 92 model. Big had been laying up for four years so it was cold seized when I got it . So It was easy enough to free the engine up and I also replaced the battery and plugs.
So I initially had real problems trying to get the bike to fire up and battery kept going down. So after much head scratching I checked there was A , a good spark B, Fuel get through . So still no joy so last night I decided to pull out the fuel injectors and turn the engine over to see if all where firing . I found number three was not . I also found that the top o ring was had a tear in it .
This morning I cleaned the blocked injector with carb cleaner and checked it was electrically firing ,all good .
This is where I'm in trouble I think , I was fitting the rail with the injectors back into the holes in the block and Im not sure when they are in correctly. So I screwed in the the two mounting screws and started up the bike after a couple of tempests and it ran sweet for 15 minutes, After lunch I came out agin and started up the bike only to see a huge amount of fuel coming out from above the rocker cover ( I had the fairing back on so I couldn't see where exactly where or if it was fuel ) I switched off and stipped fairing off.
So Im thinking that rail is not seated properly for injectors. Is there a correct procedure ?



Last edited by Peterk100rs on Thu Feb 23, 2017 6:23 am; edited 1 time in total

    

2Back to top Go down    Re: Fitting fuel injector on Wed Feb 22, 2017 6:59 pm

BobT

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First of all the K100RS was not made in 1994 the K1100 was out by then.
The fuel would have been coming from somewhere around the fuel rail, the bit the attaches to the top of the injector. There are rubber o rings in there and if the bike has been standing a while, and you have disturbed them, then one of them could be suspect or one of the pipes to that fuel rail could be leaking.
It is very simple to drop the side fairing to see what is happening,

    

3Back to top Go down    Re: Fitting fuel injector on Wed Feb 22, 2017 8:07 pm

RicK G

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Hi Peter welcome to the forum.
If you put your model and the VIN in your signature line it helps those helping as the model was available for over 20 years with many variants. We can tell from the VIN exactly which one it is.
I have found that a light coating of petroleum jelly will help the injectors seat properly. I always seat each injector into the head then place the fuel rail onto them then replace the clips that hold the injectors to the rail then bolt the rail down, don't rely on bolting the rail down to seat the injectors as it wont always happen.


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If everything seems under control then you aint goin fast enough:- Mario Andretti
Bikes 1986 K100RT, 1993 K1100 LT, 1994 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 & 1976 SR 500 Yamaha for now
    

4Back to top Go down    Re: Fitting fuel injector on Wed Feb 22, 2017 11:03 pm

Holister

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Hi Peter and welKome to the forum.

.... I also found that the top o ring was had a tear in it .
You need to replace the kits on all injectors. It seems they're getting a little old.
Something like this is what you need
Also, probably a good idea to clean all your injectors while you have them out.
Cheers

    

5Back to top Go down    Re: Fitting fuel injector on Thu Feb 23, 2017 5:18 am

92KK 84WW Olaf

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If the bike was laid up its also possible and most likely the fuel lines were gone hard and have cracked. You will have been moving them about to get them off the injector rail and on 2 Ks with me that has resulted in them cracking. Replacement is cheap and easy enough but requires the bottom of the airbox being taken out to get the connections on the Fuel Pressure Regulator [FPR].


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1992 K100LT 0193214 101,000 miles
1984 K100RT 0022575 Baja Red bought 36,000 now 87,100 miles
1997 K1100LT 58,000 miles
    

6Back to top Go down    Thanks Bob on Thu Feb 23, 2017 6:07 am

Peterk100rs

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BobT wrote:First of all the K100RS was not made in 1994 the K1100 was out by then.
The fuel would have been coming from somewhere around the fuel rail, the bit the attaches to the top of the injector. There are rubber o rings in there and if the bike has been standing a while, and you have disturbed them, then one of them could be suspect or one of the pipes to that fuel rail could be leaking.
It is very simple to drop the side fairing to see what is happening,
Thanks Bob
You are infact right . I went back and checked the log book and the bike had been previously registered in 1992.

    

7Back to top Go down    Correct method sounds good . on Thu Feb 23, 2017 6:10 am

Peterk100rs

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RicK G wrote:Hi Peter welcome to the forum.
If you put your model and the VIN in your signature line it helps those helping as the model was available for over 20 years with many variants. We can tell from the VIN exactly which one it is.
I have found that a light coating of petroleum jelly will help the injectors seat properly. I always seat each injector into the head then place the fuel rail onto them then replace the clips that hold the injectors to the rail then bolt the rail down, don't rely on bolting the rail down to seat the injectors as it wont always happen.
Hi
Thanks for the info . I removed all the injectors this morning and the rail to check for any damage. I did notice the o rings on all injector where a bit flat and hard so Ive ordered a new set . Fitting the injectors to the block first does make sense and I will used the petroleum jelly too as I know this works well .Thanks for your help .

    

8Back to top Go down    Moto bins on Thu Feb 23, 2017 7:57 am

Peterk100rs

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Well after taking some advice last night on here I ordered a seal kit for the Injectors. Haven't fitted it yet but just to say it arrived this morning from Moto bins, thats some service. Now to the shedstudy

    

9Back to top Go down    Re: Fitting fuel injector on Thu Feb 23, 2017 10:06 am

Point-Seven-five

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Nice looking bike. I see the previous owner got tired of dealing with cracked exhaust pipes and like myself, installed an early model K100 exhaust on your bike.


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Present:
1994 K75RT
1994 K75S
1992 K100RS

Past:
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

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