BMW K bikes (Bricks)


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1Back to top Go down   It's alive again!!!!! Empty It's alive again!!!!! Sun Jun 14, 2015 9:50 pm

Dai

Dai
Life time member
Life time member
After being K-less for about six weeks Low Flying Brick fired up again this afternoon. I've done the tappets (five out of eight needed replacing - one exhaust was down to 2 thou!!) and that's made a real difference to the sound of the engine. I also made a complete new wiring loom which was modified from the original diagram to suit the Honda switches; that's by far the most complex loom I've ever modified and built. I made a couple of errors (it does help to provide power from the starter relay to the rest of the bike for instance.... Shocked ) but nothing that was difficult to track down or fix.

One thing I discovered along the way: BMW seem to have used two different AMP connectors on the FICU at different times. I bought a secondhand '85 K100 wiring loom to strip for the FICU and ICU connectors (they're not available new from AMP) and assumed it was the same as my '83 one. Not so. The hooks on the nose of the plugs are slightly different shapes, the '85 one has two small locating strips molded on one side and the '83 one has a locating strip molded into the socket on the FICU. Three snips with the wire cutters later and the '85 plug now fits the '83 socket securely.

But! it's not quite finished yet. I still have to reassemble the bodywork and heat-soak the engine so that I can balance the throttle bodies again. It'll be done by next weekend - I hope! - then I can put the Bandit back into its obscure corner.


__________________________________________________
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
    

2Back to top Go down   It's alive again!!!!! Empty Re: It's alive again!!!!! Mon Jun 15, 2015 5:25 am

Born Again Eccentric

Born Again Eccentric
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Nice work Dai. A big undertaking with the wiring loom, glad it worked out OK for you.

I was getting a little worried that your new found tin box license was going to usurp poor old LFB and she would become one of those projects....

Reading knowledgable posts like yours make me feel guilty and leaves me thinking I should be doing all those engine jobs like valve clearances, injector cleans and throttle body balancing....but everything seems to be running OK and I'm currently getting 5.2l per 100km on my commute and, yesterday even managed to get a personal best of 5.03l/100km (56mpg) when out riding over the Quantox, North Devon coast road and Exmoor - despite a lot of low gear work and a fast run home. 

Maybe I should get my donor bike engine and gearbox up on the work bench and use the time to get that refurbished instead.


__________________________________________________
It's alive again!!!!! Uk-log10 It's alive again!!!!! Sco-lo15
                              Paul  It's alive again!!!!! 905546712

"Heidi" K100LT 1991 (Grey) (VIN 0190172 Engine No. 104EB 2590 2213) - 5th owner. January 2014 (34,000 - 82,818 miles and counting....)
"Gretel" K100LT 1989 (Silver Grey) (VIN 0177324 Engine No. 104EA 2789 2211) - 4th+ owner. September 2015 (82,684 miles and counting....). Cat C Insurance write-off rebuild Feb 17
"Donor" K100LT 1990 (Red)  (VIN 0178091 Engine gone to Dai) - 6th & final owner (crash write-off now donor bike).   June 2012 (73,000 miles) to November 2013 (89,500 miles)
    

3Back to top Go down   It's alive again!!!!! Empty Re: It's alive again!!!!! Mon Jun 15, 2015 5:35 am

charlie99

charlie99
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fingers crossed it all comes together mate


__________________________________________________
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 )
    

4Back to top Go down   It's alive again!!!!! Empty Re: It's alive again!!!!! Sat Jun 20, 2015 10:12 pm

Dai

Dai
Life time member
Life time member
Well it was alive. Sad I took it out today to heat-soak the engine so I could set the throttle bodies up. The short ride went well and I'm quite happily sitting in my garage with the arse-end poking out of the door and the vacuum gauges on the throttle bodies when there's a god-awful grating noise from the engine and the overflow bottle starts making like a steam loco. Engine off in a hurry and it didn't take long to figure that the fan blades had jammed (probably something dropped in there) and the fan motor had burnt out.

A check on Motorworks' website showed secondhand fans at £75 each ( Shocked !!!) and new ones at double that price, so in forlorn hope I turned to ebay. I checked a couple of pages but nothing really doing; a couple in the US at reasonable prices but the shipping and tax is horrendous; a couple in the UK at almost the same price as Motorworks but not looking that great. I changed the search terms slightly and suddenly there was a nearly perfect three-row radiator and fan for £75 inc. P&P BIN. So I did Very Happy  bounce .


__________________________________________________
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
    

5Back to top Go down   It's alive again!!!!! Empty Re: It's alive again!!!!! Sat Jun 20, 2015 10:16 pm

charlie99

charlie99
VIP
VIP
poor sod dai
but good to hear there is a recovery happening

wonders why you didn't look up the thin type 6.5 inch or whatever fans and make a adaptor ?  robmac posted the template for the mountings in here somewhere

cheers


__________________________________________________
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 )
    

6Back to top Go down   It's alive again!!!!! Empty Re: It's alive again!!!!! Sun Jun 21, 2015 8:31 am

Dai

Dai
Life time member
Life time member
I wanted to change the radiator on mine anyway because I managed to do a small amount of damage to it with a power hose (knocked out about 5% of the fins). Aaahhh - wanna bet I find bits of fin in the fan motor? Serves me right, if so.

[Edit] It seems I'm not guilty. I got the fan motor off and found that the negative brush was non-existant and the brush holder was cracked and rubbing on the commutator. The positive brush was still a good fifteen-twenty millimetres long, so the conclusion is that whatever jammed the negative brush had been there for a long time.


__________________________________________________
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
    

7Back to top Go down   It's alive again!!!!! Empty Re: It's alive again!!!!! Sun Jun 21, 2015 3:25 pm

walfish

walfish
Life time member
Life time member
Or you could try this, Iv'e not tried yet but have been told they will fit a K.

http://www.ebay.co.uk/itm/271053572017?_trksid=p2060353.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT

It's alive again!!!!! 22936


__________________________________________________
It's alive again!!!!! Uk-log10
                            88 K75 S 0107569 (she's a keeper)
                            88 K 100  0033026 (gone)
   
                            92 K 1100 LT  6455097 (gone)
    

8Back to top Go down   It's alive again!!!!! Empty Re: It's alive again!!!!! Sun Jun 21, 2015 4:08 pm

Dai

Dai
Life time member
Life time member
Sometimes it's tempting to buy something just to see if you can make it fit, even if you don't need it!!! It's alive again!!!!! 652573


__________________________________________________
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
    

9Back to top Go down   It's alive again!!!!! Empty Re: It's alive again!!!!! Sun Jun 21, 2015 9:34 pm

Holister

Holister
Life time member
Life time member
Dai wrote:.... I also made a complete new wiring loom which was modified from the original diagram to suit the Honda switches; that's by far the most complex loom I've ever modified and built. ....
Would be great to get some additional information about how you went about this Dai. Which Honda switches did you use? What modifications were needed with the wiring etc.
Cheers


__________________________________________________

1989 K100RT     VIN  0097367 (naked)  
1996 K1100RS   VIN  0451808
 It's alive again!!!!! Austra12    Fuel:  95 Octane
Engine Oil: Nulon Full Synthetic 15W50
Gear Box Oil:  Nulon Synthetic 75W90
    

10Back to top Go down   It's alive again!!!!! Empty Re: It's alive again!!!!! Sun Jun 21, 2015 10:00 pm

Dai

Dai
Life time member
Life time member
Good question! I'd had some experience of fuel-injected looms before (my Guzzi California 1100ie) so I was pretty sure that by the time I'd 'untangled' the original wiring diagram I was going to find that both the FICU and the ICU were on separate circuits and that was exactly what I found. I drew them out as separate diagrams and made them as individual sub-looms that plugged into the main loom. The original BMW loom obviously works but it's not logical in the fusing department (I did wonder if Mr. Honda had been talking to Mr. BMW because Honda stick fuses in the middle of the looms too, not near the power feed where everyone else does).

I had to use 1970s Honda switches because I needed the built-in clutch bracket on the leftside switch; the K100 handlebars are too narrow to take separate switches and levers. You can't use mid-Eighties onwards switches because Honda moved to CDI ignition which requires the killswitch to make to earth. The earlier switches break the power feed to the ignition system. You could always ride with one of the later killswitches in the permanently 'off' position... Very Happy

Because the BMW self-cancelling system effectively requires three switches, you lose it but... None of my other bikes have self-cancelling indicators so I'm not going to miss it. This means replacing the original BMW flasher unit with any old 12-volt 4-way unit. Wiring wise, the existing black/blue wire in the righthand BMW switch moves across to the leftside Honda switch.

I was talking to ComberJohn about the cafe-racer crowd sticking with the standard BMW switches when a few relatively simple mods to the wiring loom means that they can use any handlebar switches and, more importantly, it opens up a whole world of new master cylinders too. I helped a Polish member on this forum (Piotr) do exactly that, so I guess it's about time I posted the end wiring diagram and the instructions to go with it.


__________________________________________________
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
    

11Back to top Go down   It's alive again!!!!! Empty Re: It's alive again!!!!! Sun Jun 21, 2015 10:35 pm

Two Wheels Better

Two Wheels Better
Moderator
Moderator
Dai wrote:Sometimes it's tempting to buy something just to see if you can make it fit, even if you don't need it!!! It's alive again!!!!! 652573

That is the cooling fan I'm using on the Big Block. It works a charm.

The reason I'm using a slim type is because it clears the 44mm stainless steel intake elbows the 38mm TBs are at the end of. The original fan motor is so very long in the proboscus. This replacement clears and is spread nicely across the (three row) width and breadth of the
rad-yator. Smile


__________________________________________________
"A long ride is the answer to a question you will soon forget!" ~ Anonymous
1977 R75/7-100, '93 K11/K12 Big Block, '93 K1100RS, '95 R100 Mystic, '96 K1100RS, 2 x '98 K1200RS, '06 K1200R & '09 K1300GT
    

12Back to top Go down   It's alive again!!!!! Empty Re: It's alive again!!!!! Sun Jun 21, 2015 11:38 pm

Holister

Holister
Life time member
Life time member
Dai wrote:.....

Because the BMW self-cancelling system effectively requires three switches, you lose it but... None of my other bikes have self-cancelling indicators so I'm not going to miss it. This means replacing the original BMW flasher unit with any old 12-volt 4-way unit. Wiring wise, the existing black/blue wire in the righthand BMW switch moves across to the leftside Honda switch.

I was talking to ComberJohn about the cafe-racer crowd sticking with the standard BMW switches when a few relatively simple mods to the wiring loom means that they can use any handlebar switches and, more importantly, it opens up a whole world of new master cylinders too. I helped a Polish member on this forum (Piotr) do exactly that, so I guess it's about time I posted the end wiring diagram and the instructions to go with it.
Interesting. This is why I'd like to change switches to something more workable. My master cylinder is on the way out. Also, with some help, I'm building a new microcontroller to replace the flasher unit so I have greater control over how they work and how they cancel. I'm not sure how this is going to interact with the K switches but figured I'd need som wiring modification somewhere and probably different switches. I like your idea of modularising the loom.
Any additional info and pics would be helpful. Thanks Very Happy


__________________________________________________

1989 K100RT     VIN  0097367 (naked)  
1996 K1100RS   VIN  0451808
 It's alive again!!!!! Austra12    Fuel:  95 Octane
Engine Oil: Nulon Full Synthetic 15W50
Gear Box Oil:  Nulon Synthetic 75W90
    

13Back to top Go down   It's alive again!!!!! Empty Re: It's alive again!!!!! Mon Jun 22, 2015 12:21 am

Rick G

Rick G
admin
admin
I have removed the BMW indicator system on the Chookie and replaced it with Yamaha switches on both sides including the throttle twist grip and clutch mount.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1999 K1100 LT with a Big Block 1200
    

14Back to top Go down   It's alive again!!!!! Empty Re: It's alive again!!!!! Mon Jun 22, 2015 3:43 am

charlie99

charlie99
VIP
VIP
ungaas wrote:Or you could try this, Iv'e not tried yet but have been told they will fit a K.

http://www.ebay.co.uk/itm/271053572017?_trksid=p2060353.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT

It's alive again!!!!! 22936

yes been tried ...and works ...with a higher flow of air through the system ...and ...less current as well .


__________________________________________________
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 )
    

15Back to top Go down   It's alive again!!!!! Empty Re: It's alive again!!!!! Mon Jun 22, 2015 7:32 am

Dai

Dai
Life time member
Life time member
RicK G wrote:I have removed the BMW indicator system on the Chookie and replaced it with Yamaha switches on both sides including the throttle twist grip and clutch mount.
I knew I couldn't be the only one! Very Happy  Define 'Yamaha switches' Rick - early metal ones with the choke lever under the lefthand one or later ones with the lever rotating around the handlebars? I ended up mounting a Yamaha FZR 750 choke lever under the Honda CB125 switch because of the space problem with the narrow bars.

Most switches these days seem to come out of the Domino SpA factory in Italy. The external moldings are slightly different depending on which motorcycle manufacturer they're bound for (and the wire colours are different too, obviously), but the guts of the switches are frequently interchangeable. As an example, I had a lefthand unit with 'Triumph' boldy molded into it but that one had no flash/passing switch. I also had a broken lefthand unit from a Suzuki SV1000 with the flash switch. All I had to do to get the Suzuki flash switch into the Triumph unit was to open up the Triumph molding with a Stanley knife and screw the Suzuki switch in. The mounting boss was already there and in comparing the moldings, it was quite obvious that the internal 'fixings' were from the same mold.


__________________________________________________
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
    

16Back to top Go down   It's alive again!!!!! Empty Re: It's alive again!!!!! Mon Jun 22, 2015 10:18 am

Rick G

Rick G
admin
admin
They are the later type with the rotating choke lever and came directly fron the Hoo Flung Muc Chinese crappy switch company. They were $25 for the pair so I got 2 pairs and pulled one set apart and they seem to be fairly good. I also bought a bag full of connectors in various sizes for almost nothing. I think there are 120 plugs and sockets of varying sizes with pins for $38 landed here when all I could find here was about $4-6 each.
I also went to the auto wreckers and got 2 complete harnesses for $20 and got just about every colour in the book plus heaps more.  All I had to get was brown for the earths.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1999 K1100 LT with a Big Block 1200
    

17Back to top Go down   It's alive again!!!!! Empty Re: It's alive again!!!!! Mon Jun 22, 2015 10:43 am

Two Wheels Better

Two Wheels Better
Moderator
Moderator
You might be suprised, then, to know that Hoo Flung Muc have just opened on the NYSE, the Footsie and Euronext, are rated just below Alibaba in net worth and have purchased Rolls Royce, Lear and are negotiating on Apple. They started as a pig iron smelterer in Sum Win All's backyard back in 2011. Investigations show no link to the Chinese Gubmint. And, the air quality is good to excellent.
:suspect:


__________________________________________________
"A long ride is the answer to a question you will soon forget!" ~ Anonymous
1977 R75/7-100, '93 K11/K12 Big Block, '93 K1100RS, '95 R100 Mystic, '96 K1100RS, 2 x '98 K1200RS, '06 K1200R & '09 K1300GT
    

18Back to top Go down   It's alive again!!!!! Empty Re: It's alive again!!!!! Mon Jun 22, 2015 12:19 pm

Dai

Dai
Life time member
Life time member
Shocked


__________________________________________________
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
    

19Back to top Go down   It's alive again!!!!! Empty Re: It's alive again!!!!! Mon Jun 22, 2015 8:28 pm

Rick G

Rick G
admin
admin
I think you are becoming a tad cynical as you age Daz. If you try hard you may become as cynical as me but I have learned one thing from being so cynical and that is that I am no where cynical enough.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1999 K1100 LT with a Big Block 1200
    

20Back to top Go down   It's alive again!!!!! Empty Re: It's alive again!!!!! Mon Jun 22, 2015 8:47 pm

Two Wheels Better

Two Wheels Better
Moderator
Moderator
I don't use cynicism as a refuge, but it's good to visit the island once in a while.


__________________________________________________
"A long ride is the answer to a question you will soon forget!" ~ Anonymous
1977 R75/7-100, '93 K11/K12 Big Block, '93 K1100RS, '95 R100 Mystic, '96 K1100RS, 2 x '98 K1200RS, '06 K1200R & '09 K1300GT
    

21Back to top Go down   It's alive again!!!!! Empty Re: It's alive again!!!!! Sun Jun 28, 2015 8:39 am

Dai

Dai
Life time member
Life time member
The replacement radiator and fan arrived on Friday and I was bitterly disappointed. The fan had one missing brush, one broken brush and was seized solid. The three-row radiator however was in excellent condition and having emailed the seller, we're negotiating a partial refund. Meanwhile, I've ordered one of those unversal fan-thingies which is probably what I should have done originally.


__________________________________________________
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
    

22Back to top Go down   It's alive again!!!!! Empty Re: It's alive again!!!!! Mon Jul 06, 2015 1:58 pm

Dai

Dai
Life time member
Life time member
Well, it's finally back on the road. The nice clean three-row radiator I was so pleased with? It leaked. Both it and the fan are going back to the vendor tomorrow. In his favour, unless you knew what you were looking at inside the fan the damage there wouldn't have been obvious and you'd only find a leaky radiator when filling it. At this point I'm only going to be out of pocket by the cost of the postage - sh!t happens, so what.

I also checked and reset five out of the eight valve clearances; the result is that LFB no longer has the dreaded diesel knock. Taking Rick's advice and advancing the timing by four degrees does seem to have made a difference to the pickup (over and above what I'd expect from fixing the valve clearances). Not a huge amount, but combine that with the K1100 carb bodies and there's a very non-K punch at about 4300rpm. Again, not huge but noticeable. The Brembo 34/40 Goldlines on the front are doing a lovely job of slowing the whole thing up.

Finally I can put some more miles on it... Very Happy


__________________________________________________
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
    

23Back to top Go down   It's alive again!!!!! Empty Re: It's alive again!!!!! Mon Jul 06, 2015 2:24 pm

92KK 84WW Olaf

avatar
Life time member
Life time member
Well Dai feel free to put more miles heading down this direction......!

Great to see you back on the road.


__________________________________________________
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
    

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