BMW K bikes (Bricks)


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1Back to top Go down   intermittent no start on  K100 Empty intermittent no start on K100 Thu Jul 25, 2024 6:55 pm

letsgetpractical

letsgetpractical
active member
active member
I have been having an intermittent no start condition on my K100.  I discovered if I wiggled the wiring harness going to the fuel injectors it will start and run fine.  Soooo, I already inspected the externals of the harness and it looks fine with no breaks or open spots.  So I suspect its at a connection.  This harness combines with another harness and goes to the ECU? unit.  So I want to check the connection there.  It seems to be secure and has a screw holding connection in place.  I want to disconnect this connection and inspect.  Are there any precautions I should take other than disconnecting battery?  I dont want to inadvertently damage something and I know the electrical components can be tricky.  Thanks

    

2Back to top Go down   intermittent no start on  K100 Empty Re: intermittent no start on K100 Thu Jul 25, 2024 8:32 pm

Dai

Dai
Life time member
Life time member
Which year K100? If it's 83-86 wiggling the loom is almost certainly moving the fuel tank connector which is a known no-start problem. Pull it out, close up the female pins in the plug using a very small screwdriver and try again.


__________________________________________________
1983 K100 naked upgraded to K100LT spec after spending time as an RS and an RT
1987 K100RT
Others...
1978 Moto Guzzi 850-T3, 1979 Moto Guzzi 850-T3 California,1993 Moto Guzzi 1100ie California
2020 Royal Enfield Bullet 500
    

3Back to top Go down   intermittent no start on  K100 Empty Re: intermittent no start on K100 Fri Jul 26, 2024 1:32 am

Two Wheels Better

Two Wheels Better
Moderator
Moderator
Now that you've been a member for a little while, go up to Profile and then Signature and type in your year and specific model so the members know what bike you're attempting to fix. Models vary widely as far as fuel injection - Motronic or L Jetronic - and K100 models can be 8 valve (early) and 16 valve (later), with some overlap.


__________________________________________________
The forest was shrinking, but the trees kept voting for the axe, for the axe was clever, and convinced the trees that because his handle was made of wood, he was one of them. -Turkish proverb
1977 R75/7-100, '93 K11/K12 Big Block, '93 K1100RS, '95 R100 Mystic, '96 K1100RS, 2 x '98 K1200RS, '06 K1200R & '09 K1300GT
    

4Back to top Go down   intermittent no start on  K100 Empty Re: intermittent no start on K100 Fri Jul 26, 2024 4:49 pm

letsgetpractical

letsgetpractical
active member
active member
Dai wrote:Which year K100? If it's 83-86 wiggling the loom is almost certainly moving the fuel tank connector which is a known no-start problem. Pull it out, close up the female pins in the plug using a very small screwdriver and try again.
Yes, its a 1985 BMW KRT100.  Hmmm.  I see the harness that goes to the injectors is connected to another harness that goes under the tank.  I presume that is the one you are talking about.  Looks like I will have to take the fuel tank off to get at connectors, right?

    

5Back to top Go down   intermittent no start on  K100 Empty Re: intermittent no start on K100 Fri Jul 26, 2024 4:55 pm

letsgetpractical

letsgetpractical
active member
active member
Two Wheels Better wrote:Now that you've been a member for a little while, go up to Profile and then Signature and type in your year and specific model so the members know what bike you're attempting to fix. Models vary widely as far as fuel injection - Motronic or L Jetronic - and K100 models can be 8 valve (early) and 16 valve (later), with some overlap.
I just looked at my profile and included that its a 1985 BMW K100 RT.  thanks

    

6Back to top Go down   intermittent no start on  K100 Empty Re: intermittent no start on K100 Fri Jul 26, 2024 5:06 pm

Laitch

Laitch
Life time member
Life time member
Go to your Profile, click on the Signature tab and put it there, too; done that way it will show up in every post you make.


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1995 K75 90,000 miles
    

7Back to top Go down   intermittent no start on  K100 Empty Re: intermittent no start on K100 Fri Jul 26, 2024 5:11 pm

92KK 84WW Olaf

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Life time member
Life time member
If your gas tank is bolted down at the rear, the electrical connector at the front left is a very well known weak point.

You can adjust the pins a little so you get a good tight mechancail and therefore electrical connection. I bought a few rebuild kits for those connectors from www.tills.de as 3 of my Ks have those early connectors.


__________________________________________________
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
    

8Back to top Go down   intermittent no start on  K100 Empty Re: intermittent no start on K100 Fri Jul 26, 2024 6:51 pm

letsgetpractical

letsgetpractical
active member
active member
92KK 84WW Olaf wrote:If your gas tank is bolted down at the rear, the electrical connector at the front left is a very well known weak point.

You can adjust the pins a little so you get a good tight mechancail and therefore electrical connection. I bought a few rebuild kits for those connectors from www.tills.de as 3 of my Ks have those early connectors.
I cant find those kits you mentioned.  Do they still sell them?

    

9Back to top Go down   intermittent no start on  K100 Empty Re: intermittent no start on K100 Fri Jul 26, 2024 8:32 pm

Dai

Dai
Life time member
Life time member
https://www.ebay.co.uk/itm/132968760102

He's a (very good) UK seller but the pictures might help you turn up the same connector on ebay.com. Pity he doesn't name the manufacturer. Try searching just '4 way connector' under catagory 'Cars, motorcycles & vehicles'.

The connector just unplugs from the left side of the tank. Just pull straight down.


__________________________________________________
1983 K100 naked upgraded to K100LT spec after spending time as an RS and an RT
1987 K100RT
Others...
1978 Moto Guzzi 850-T3, 1979 Moto Guzzi 850-T3 California,1993 Moto Guzzi 1100ie California
2020 Royal Enfield Bullet 500
    

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