BMW K bikes (Bricks)

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1Back to top Go down   Early K100 "Unicorn" Gas cap Empty Early K100 "Unicorn" Gas cap on Tue Aug 20, 2019 4:19 pm

Tjsunny2

Tjsunny2
active member
active member
Hi All,

I am not only new to the K bike world, but the motorcycle world as a whole! I got my K100 in a series of six laundry baskets from a craigslist ad. That was a couple months ago and now it is painted, powder coated and has had pretty much every rubber part replaced. 

The last system I am restoring is the fuel system and this gas cap has me confused. I ordered a standard rebuild kit but none of the rubber bits fit. I was told by an expert at EME that I have a "unicorn" gas cap that was only used on very early bikes. 

bounce

I haven't been able to find any other details on this cap. Have any of you come across it? Any information about why it exist or how to service it would be greatly appreciated.  I have a .zip file of pictures that I will try to post since I don't have the right to post yet.

Thanks,
Dan

http://forum.kforum-tech.com/members-upload/uploads/Photos_(14).zip bounce

    

2Back to top Go down   Early K100 "Unicorn" Gas cap Empty Re: Early K100 "Unicorn" Gas cap on Tue Aug 20, 2019 5:12 pm

MartinW

MartinW
Life time member
Life time member
I believe the latter cap will fit and it is a better cap.
Regards Martin.


__________________________________________________
K75s Hybrid
    

3Back to top Go down   Early K100 "Unicorn" Gas cap Empty Re: Early K100 "Unicorn" Gas cap on Tue Aug 20, 2019 5:42 pm

duck

duck
Life time member
Life time member
@MartinW wrote:I believe the latter cap will fit and it is a better cap.
Regards Martin.

What he said. The early gas caps weren't too reliable which is why they were replaced. A newer style one will fit perfectly.


__________________________________________________
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
    

4Back to top Go down   Early K100 "Unicorn" Gas cap Empty Re: Early K100 "Unicorn" Gas cap on Wed Aug 21, 2019 6:37 am

92KK 84WW Olaf

92KK 84WW Olaf
Life time member
Life time member
The early one is a push in type to open it.

The later one if you get the complete unit screws straight in, straight swap.

The later one can also go wrong but if it does there is a solution by drilling a hole in it so it remains totally usable. Its on the forum here. The wise would have the hole drilled and bunged!!!


__________________________________________________
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
    

5Back to top Go down   Early K100 "Unicorn" Gas cap Empty Re: Early K100 "Unicorn" Gas cap on Wed Aug 21, 2019 10:39 pm

Tjsunny2

Tjsunny2
active member
active member
Thanks for the replies everyone. That's very interesting. What is the mode of failure on these old ones?

    

6Back to top Go down   Early K100 "Unicorn" Gas cap Empty Re: Early K100 "Unicorn" Gas cap on Thu Aug 22, 2019 12:35 am

duck

duck
Life time member
Life time member
I haven't handled one in a while but the high level issue is that the early ones have a "button" that can be left locked or unlocked.  The latter caps are much simpler in that you just turn a key each time to open it so the internal mechanicals are much simpler and less prone to failure.


__________________________________________________
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
    

7Back to top Go down   Early K100 "Unicorn" Gas cap Empty Re: Early K100 "Unicorn" Gas cap on Fri Aug 23, 2019 8:58 am

Tjsunny2

Tjsunny2
active member
active member
Ah I see. I think I'm going to cut a gasket myself as a short term solution. Later on I'll up fit the non-push button versions. Thanks again for the help!

    

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