BMW K bikes (Bricks)


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1Back to top Go down   New from Denver CO Empty New from Denver CO Wed Oct 23, 2019 5:15 am

winmag4582001

winmag4582001
active member
active member
Hello all,
My 17yr old son just picked up a 89 K100rs that he’s going to strip and build to match his 87 535is.
We’ll probably be asking some questions on here(we’ll try the search function first). For starters it’s a clean bike with non functioning ABS that we’re going to eliminate. Only real issue with the bike is it won’t start when cold unless you fog her throat with a little eather. Then it fires up and purrs like a kitten and runs hard, we’re assuming it’s a failing fuel pump or blocked FF.
We’re looking forward to the project!

    

2Back to top Go down   New from Denver CO Empty Re: New from Denver CO Wed Oct 23, 2019 5:35 am

Arlina

Arlina
Moderator
Moderator
Welcome Winmag Smile


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New from Denver CO Eu-log10  K1100RS/LT - R1200RT - R1100RS - Cagiva SST 350 Ala Verde - K75LT project - K75 Schurgers - K75S - K1100RS - K75RT - K75C
    

3Back to top Go down   New from Denver CO Empty Re: New from Denver CO Wed Oct 23, 2019 6:37 am

moriarti

moriarti
Life time member
Life time member
Hi i take it the bike starts ok when warm,with the Ks if we presume to assume shit happens
Easy start products are not recommended,if the engine spins at a good speed,on starter do compression test and start from there,good luck with the project. New from Denver CO 177912


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1984 k100 rs red/black VIN  0004449 Now sold to Olaf
    

4Back to top Go down   New from Denver CO Empty Re: New from Denver CO Wed Oct 23, 2019 7:58 am

MartinW

MartinW
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Life time member
After failure to start check the spark plugs. Are they wet or dry?
Regards Martin.


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1992 K75s
    

5Back to top Go down   New from Denver CO Empty Re: New from Denver CO Tue Oct 29, 2019 9:11 pm

winmag4582001

winmag4582001
active member
active member
OK, so we are pulling it all down. Since it's snowing it gives time.
We'll check valve clearance and do all the typical stuff.
Searching the forums I think we may go with K75 pistons and hone then re ring it.
My son has a 82 320i, 84 533i, 85 535i and a 87 535is. The motorcycle looks to be typical 80's BMW technology.  Very Happy

As far as the no start when cold, we cranked on it for 5 minutes and got no heavy fuel smell out of the exhaust.  There's no excessive fuel smell in the oil either. Had the same issue on the 85 535i and we installed a 255lph in tank pump and bypassed the external fuel pump and it literally starts with a tap of the key, and it has 244k miles on it. Since then we've converted all the cars to a in tank only pump. Not really concerned since we're going through it. We'll post pics as we progress.

    

6Back to top Go down   New from Denver CO Empty Re: New from Denver CO Tue Oct 29, 2019 9:34 pm

Laitch

Laitch
Life time member
Life time member
winmag4582001 wrote:Only real issue with the bike is it won’t start when cold unless you fog her throat with a little eather. Then it fires up and purrs like a kitten and runs hard
Welcome. If it purrs and runs well, why would you consider changing the pistons and re-ringing it?


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1995 K75 90,000 miles
    

7Back to top Go down   New from Denver CO Empty Re: New from Denver CO Wed Oct 30, 2019 2:26 am

charlie99

charlie99
VIP
VIP
winmag4582001 wrote:OK, so we are pulling it all down. Since it's snowing it gives time.
We'll check valve clearance and do all the typical stuff.
Searching the forums I think we may go with K75 pistons and hone then re ring it.
My son has a 82 320i, 84 533i, 85 535i and a 87 535is. The motorcycle looks to be typical 80's BMW technology.  Very Happy

As far as the no start when cold, we cranked on it for 5 minutes and got no heavy fuel smell out of the exhaust.  There's no excessive fuel smell in the oil either. Had the same issue on the 85 535i and we installed a 255lph in tank pump and bypassed the external fuel pump and it literally starts with a tap of the key, and it has 244k miles on it. Since then we've converted all the cars to a in tank only pump. Not really concerned since we're going through it. We'll post pics as we progress.

you wouldn't hone it at all
the cylinders are lined nickasil , and there is virtually no wear to talk about , k75 pistons fit straight in , same bore and stroke

starting issue , more likely a fuel pressure regulator - injector clean issue , the correct bmw pump has a backflow valve which maintains pressure for a good while along the pressure rail , if the pressure regulator weeps internally a bit, as they can do , could take some time to get fuel to pressure along the fuel rail for the injectors .

just do the irregular maintenance required for any neglected engine and im sure you will be surprised

welcome aboard


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cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
1987 k100rs ########   "Red"  - (red sports rs TWB style )
1989 K100rt #009637   "Black Betty"  (naked rt ala Nigel , now sporting an rs main fairing )
    

8Back to top Go down   New from Denver CO Empty Re: New from Denver CO Sat Nov 02, 2019 4:39 am

winmag4582001

winmag4582001
active member
active member
Charlie99 Thanks for letting me know about the cylinder lining. My son and I are new to street bikes. Been into cars forever. We’re eager to open it up and play. He read somewhere that the K75 pistons were higher compression, that’s the reason behind finding a set for it. The boy has a lot of energy and I have to give him credit, he’s a better mechanic and electrician than most adults I know. LOL Thanks for the replies!

    

9Back to top Go down   New from Denver CO Empty Re: New from Denver CO Tue Nov 12, 2019 7:16 am

88

88
Life time member
Life time member
Nice project. Good luck with it.


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New from Denver CO Ir-log1188....May contain nuts!New from Denver CO Ir-log11

"The world is a book and those who do not travel read only one page." - St. Augustine from 1600 years ago & still true!

K1 - 1989 - AKA Titan (unique K1/K1100RS hybrid by Andreas Esterhammer)
K1100RS - 1995. AKA Rudolf Von Schmurf (in a million bits)
K100RS - 1991 AKA Ronnie. Cafe racer project bike
K75RTP - 1994
K75C - 1991 AKA Jim Beam. In boxes. 
K1100LT 1992 - AKA Big Red (gone)
K100LT - 1988 - AKA the Bullion brick. Should never have sold it.
    

10Back to top Go down   New from Denver CO Empty Re: New from Denver CO Tue Nov 12, 2019 9:59 am

duck

duck
Life time member
Life time member
Fuel filter - NAPA 3032


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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
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

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