BMW K bikes (Bricks)

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1Back to top Go down   K100RS - can I do it... Empty K100RS - can I do it... on Tue May 28, 2019 3:50 pm

JonyBoy

JonyBoy
active member
active member
After Finland beat Canada in the ice hockey world champs final on Sunday...Smile I have managed to get back to my K-project.

I have two small problems, one being that I am doing this basically from the back of the garden, the other is that I also want to be able to ride the bike whilst working on it. Riding period here in Finland is very condensed and we only get abt 2-3 months of good riding weather.

So, I have taken off pretty much everything I can, and put on temp head lights, indicators etc to keep it legal and on the road. I have also ordered some bits like a new exhaust system, fuel injectors and K1200 wheels (thanks to instructions from the forum) that I can put on without completely taking it apart and still ride it. Then when the winter comes I am hoping I have majority of bits I need and can do all the painting etc customising. Thats the plan...

So...I started changing the oil and filter today. To my frustration, the oil drain plug / screw hex was so badly rounded I could not unscrew it. I drained the oil via the filter hole so thats ok, but I am left with a bum drain plug. As its a back of the garden job I cant tinker too much with the screw, so the next time I change the oil / possibly take the engine off for paints, should I just take the oil pan off and get a look at it, or take it to a machinist etc?

On a side note, as I was fiddling with the drain screw after I drained the oil, I managed to dip the side of my head in the oil collector bucket...not sure if I have washed my hair with w/up liquid before!

    

2Back to top Go down   K100RS - can I do it... Empty Re: K100RS - can I do it... on Tue May 28, 2019 4:02 pm

duck

duck
Life time member
Life time member
You really don't need to worry about the drain plug.  I change the filter every time I change the oil and don't bother with using the drain plug.


__________________________________________________
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
    

3Back to top Go down   K100RS - can I do it... Empty Re: K100RS - can I do it... on Tue May 28, 2019 4:45 pm

volador

volador
Silver member
Silver member
Try to tap in a male Torx drive into the stripped drain plug hex to remove it



Last edited by volador on Sun Jun 09, 2019 2:50 pm; edited 2 times in total


__________________________________________________
1984 K100RS  1991 K100RS
    

4Back to top Go down   K100RS - can I do it... Empty Re: K100RS - can I do it... on Tue May 28, 2019 5:17 pm

Dai

Dai
Life time member
Life time member
You don't need to change the oil filter every time (okay, some of us do and some of us do it every second oil change Very Happy ) but as Duck says, dropping the oil through the filter sump is the fastest way to drain it. You don't need to take the sump off completely. Chances are the sump will be glued to the engine pan. Wind the screws out about half way, the tap the filter sump with a hammer on the end of a long screwdriver and make sure you have a large drain pan because the oil will come out like the proverbial waterfall.


__________________________________________________
'83 K100 upgraded to K100RS spec
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California,
'03 Suzuki Blandit GSF600SK3 (NFS any more because wifey has claimed it)
    

5Back to top Go down   K100RS - can I do it... Empty Re: K100RS - can I do it... on Tue May 28, 2019 7:02 pm

brickrider2

brickrider2
Life time member
Life time member
Wow, that sounds like a prescription for a real mess.  
I can hardly wait for the step-by-step instructions for renewing the transmission oil.  Wink


__________________________________________________
1996 K1100LT
    

6Back to top Go down   K100RS - can I do it... Empty Re: K100RS - can I do it... on Tue May 28, 2019 7:12 pm

duck

duck
Life time member
Life time member
@brickrider2 wrote:Wow, that sounds like a prescription for a real mess.  
I can hardly wait for the step-by-step instructions for renewing the transmission oil.  Wink

When you drain the transmission gear oil it's a good idea to use some foil to channel it away from the center stand.  If you don't then when it gets to the last 0.1 liter the stream likes to cling to the center stand and make a nice puddle on the floor.


__________________________________________________
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   K100RS - can I do it... Empty Re: K100RS - can I do it... on Tue May 28, 2019 7:40 pm

Point-Seven-five

Point-Seven-five
Life time member
Life time member
I don't have an engine handy to check, but I believe the drain plug extends several mm from the oil pan.  It may be possible to get the second most valuable tool(after a large hammer), Vise Grips, clamped on to unscrew the drain plug.  I know the plug extends enough to make everything rock when supporting the bike on a block under the oil pan.


__________________________________________________
Present:
1994 K75RT
1991 K100RS
1988 K100RS SE

Past:
1994 BMW K75S
1992 BMW K100RS
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

8Back to top Go down   K100RS - can I do it... Empty Re: K100RS - can I do it... on Tue May 28, 2019 9:07 pm

duck

duck
Life time member
Life time member
When screwed in the top of the drain plug only extends a few mm beyond the fins on the sump plate.  I think you'd be hard-pressed to get Vise-Grips on it.

You could try either a Torx bit or EZ-Out on the stripped Allen hole.


__________________________________________________
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
    

9Back to top Go down   K100RS - can I do it... Empty Re: K100RS - can I do it... on Thu May 30, 2019 8:31 am

Dai

Dai
Life time member
Life time member
@brickrider2 wrote:Wow, that sounds like a prescription for a real mess.  
I can hardly wait for the step-by-step instructions for renewing the transmission oil.  Wink
K100RS - can I do it... 44271 There is a trick to it. If you only just wind one screw out and wind the other two a couple of threads out, you can direct the oil where you want it to go without triggering an oilfall.


__________________________________________________
'83 K100 upgraded to K100RS spec
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California,
'03 Suzuki Blandit GSF600SK3 (NFS any more because wifey has claimed it)
    

10Back to top Go down   K100RS - can I do it... Empty Re: K100RS - can I do it... on Fri May 31, 2019 7:53 am

GF Wollongong

GF Wollongong
Gold member
Gold member
Get some EZ-Outs.

I had a stripped rear disc brake retaining bolt. A lot of surface area and only a 5mm allen key.

Drilled it out to be able to use the bigger EZ-out tools. Secured it into place with a whack from a hammer.

Then it came straight out. 

Mind you, hitting it with a hammer (not too hard) often jars a stuck fastener (hairline fracture in the tread?) or helps to bed the tool in (eg screwdriver, allen keys etc)

You'll get it

G

    

11Back to top Go down   K100RS - can I do it... Empty exhaust fun... on Fri Jun 07, 2019 1:30 pm

JonyBoy

JonyBoy
active member
active member
This is more of a comment than a question but comments welcome: I ordered and received a new exhaust (MAC 4 into 1 + can) which I got from eBay in the US. I asked the seller about mods vs standard fitting before I placed the order and the response was "it all fits standard no mods". Well...after paying a hefty customs fee I started fitting it in. A few things happened:

The gasket cylinder bolt holes were 3mm closer together than the standard (63mm vs 66m by my mesurement). This is not a big issue, I can work this with a file or similar. The pipe tube itself is 2mm narrower than the standard (37mm vs 39mm). Not big issues, but I am a bit worried about the seal ring. The standard copper ring is obviously bigger in diameter (40mm?), and I havent yet tried it on with the new pipe to see if its an issue. I was thinking about cutting some gasket sheet material around the ring, but havent found anything that will take the heat. What about exhaust mounting paste, or some sort of copper silicone gasket sealant? 

Also the can support mounting does not align at all with the rear set holeys...so more to think about.


__________________________________________________
K100RS -92 Cafe Racer project...Have a Great day, Every day!
    

12Back to top Go down   K100RS - can I do it... Empty Re: K100RS - can I do it... on Fri Jun 07, 2019 3:04 pm

duck

duck
Life time member
Life time member
Just guessing but it might be the exhaust for a 2 valve K100RS, not a 4 valve.

Pictures?


__________________________________________________
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
    

13Back to top Go down   K100RS - can I do it... Empty Re: K100RS - can I do it... on Fri Jun 07, 2019 9:08 pm

volador

volador
Silver member
Silver member
Copper ring part # ?


__________________________________________________
1984 K100RS  1991 K100RS
    

14Back to top Go down   K100RS - can I do it... Empty Re: K100RS - can I do it... on Sat Jun 08, 2019 4:23 am

JonyBoy

JonyBoy
active member
active member
@volador wrote:Copper ring part # ?

This is what I assume is the original part # 11 62 7 662 083

There was no seal in when I dismantled the original exhaust...


__________________________________________________
K100RS -92 Cafe Racer project...Have a Great day, Every day!
    

15Back to top Go down   K100RS - can I do it... Empty Re: K100RS - can I do it... on Sat Jun 08, 2019 4:52 am

JonyBoy

JonyBoy
active member
active member
@duck wrote:Just guessing but it might be the exhaust for a 2 valve K100RS, not a 4 valve.

Pictures?


Heres the exhaust...or what picture were you after? K100RS - can I do it... 20190610


__________________________________________________
K100RS -92 Cafe Racer project...Have a Great day, Every day!
    

16Back to top Go down   K100RS - can I do it... Empty Re: K100RS - can I do it... on Sat Jun 08, 2019 4:57 am

JonyBoy

JonyBoy
active member
active member
I managed to file / grind the bolt holes with a drillbit, so now it at least fits in place. Unfortunately, as the pipe diameter is as explained narrower, its leaking exhaust from the cylinder / gasket fitting. It needs a good fitting seal, which I will have to fiddle with.

K100RS - can I do it... 20190611


__________________________________________________
K100RS -92 Cafe Racer project...Have a Great day, Every day!
    

17Back to top Go down   K100RS - can I do it... Empty Re: K100RS - can I do it... on Sat Jun 08, 2019 11:13 am

duck

duck
Life time member
Life time member
When I look at the K100 MAC exhausts on Ebay they are for 2 valve Ks, not 4 valve Ks.

It says 86-91 because the 2 valve K100LTs were produced through 1991.

As for the leaking that may be because the header doesn't go far enough into the bottom of the head.  If that is the case then adding more gasket rings might solve the issue.


__________________________________________________
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
    

18Back to top Go down   K100RS - can I do it... Empty Re: K100RS - can I do it... on Sat Jun 08, 2019 2:04 pm

Point-Seven-five

Point-Seven-five
Life time member
Life time member
It's odd that a 2v exhaust won't fit a 4v engine.  I replaced a cracked K100RS4V exhaust with an early K100 2v exhaust and the only issues were the alignment at the rear mount and the centerstand.  Even with that, it only took a little fiddling to get the mount to line up.  The connections at the head were identical.


__________________________________________________
Present:
1994 K75RT
1991 K100RS
1988 K100RS SE

Past:
1994 BMW K75S
1992 BMW K100RS
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

19Back to top Go down   K100RS - can I do it... Empty Re: K100RS - can I do it... on Sat Jun 08, 2019 7:40 pm

volador

volador
Silver member
Silver member
Try some Heat-Wrap Tape and Permatex Ultra Copper sealant

1. slightly flatten out the copper gasket in a vise or in-between 2 pieces of flat metal and a vise
2. put Heat-Wrap Tape around the header tip and fold tape over to build up the sidewall
3. apply bead of Permatex Ultra Copper sealant to the header tip/tape and gaskets
4. put everything together finger tighten the nuts
5. let sit 12-24hrs for the Permatex to cure
6. final tighten to torque spec


__________________________________________________
1984 K100RS  1991 K100RS
    

20Back to top Go down   K100RS - can I do it... Empty Re: K100RS - can I do it... on Sun Jun 09, 2019 7:47 am

JonyBoy

JonyBoy
active member
active member
thanks, thats good. I didnt think about the heat wrap...also, as I could not get my hands on original seal rings, I applied some inventiveness (piccie). This also allows me to make the ring any size required. The heat wrap would make the seal more tight. Anyone used mounting paste before, is it easy to scrape off?

K100RS - can I do it... 60da2e10


__________________________________________________
K100RS -92 Cafe Racer project...Have a Great day, Every day!
    

21Back to top Go down   K100RS - can I do it... Empty Re: K100RS - can I do it... on Sun Jun 09, 2019 4:51 pm

volador

volador
Silver member
Silver member
The OEM crush exhaust gasket when slightly flattend OD=40mm ID=32mm

Use the OEM gaskets with some sealant that should solve the leaking

Replace the OEM stud mounting nuts with Stainless Steel or Monel nuts
Apply copper anti-seize to mounting studs

K100RS - can I do it... Gasket12
K100RS - can I do it... Gasket13

If you can not get OEM gaskets some parts vendor, Honda/Yamaha/Kawy/Suzuki/etc... probably has something that will match closely


__________________________________________________
1984 K100RS  1991 K100RS
    

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