Author Topic: Phoenix Rising - '93 K75RT Fire Recovery  (Read 2407 times)

Offline brichbk

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Phoenix Rising - '93 K75RT Fire Recovery
« on: July 13, 2018, 08:55:51 PM »
I am beginning to rebuild my 1993 K75RT after a fire around the throttle body area.  You can see the whole story here http://www.motobrick.com/index.php/topic,11273.0.html.

Here is my plan
Stage 1:  Clean up after the fire. 
Stage 2:  Replace burned Parts
Stage 3:  Replace other parts that were needed pre-fire

Stage 1 is beginning.
Any suggestions on what I need to do to clean up after the fire? 

My biggest concern is that I'm pretty sure water and fire extinguisher residue got into the engine through the fuel injector holes and possibly through the throttle bodies. The throttle bodies were covered by the air box intake chamber so may not have gotten stuff in it.

Will I have to open up the engine to clean it or will it be enough to  just change the oil? (See Pictures)



The rest of the exterior has cleaned up pretty good.  I have a small dime size (about 17 mm) white spot on the gas thank that I think I can get some touch up paint to fix.  It is located behind the fairing so it won't show.

I appreciate all the help that this great group can provide.


Step 2 not yet started, currently sourcing parts:
Here are the parts I'm need to replace:
Post-Fire
  • Fuel Rail
    Fuel Injector Wire harness
    Top section of an air box
    air box intake chamber and boots
    plastic ignition cover
    Fuse and Relay box
    Fuse box
    left side panel (dark blue color)
    Fuel Injectors
    spark plug wires
    throttle cable
    choke cable
    fuel hoses
    vacuum hose and metal spring protector

Step 3 not yet started:
Pre Fire
  • Fork Seals
    Motobins driveshaft insert
    change fluids

  • Central Valley California
  • 1993 BMW K75RT // 1982 Honda Nighthawk 650sc

Offline Martin

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Re: Phoenix Rising - '93 K75RT Fire Recovery
« Reply #1 on: July 14, 2018, 02:00:57 AM »
You can downsize the nozzle of your shop vac with a reducer kit or by taping various bits of hose together . You could then attach a piece of 3/8" nylon hose the vacuum cleaner. I would fit a piece of white "T" shirt type material between the built up bit and the standard vacuum cleaner hose. Stick the 3/8" into the spark plug hole one at a time and wiggle it about and observe what has been caught in the cloth. Once you have no debris in the cloth you can then decide if you want to pull the head.

Regards Martin.
  • North Lakes Queensland Australia
  • 1992 K75s Hybrid, Lefaux, Vespa V twin.

Offline brichbk

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Re: Phoenix Rising - '93 K75RT Fire Recovery
« Reply #2 on: October 04, 2018, 12:37:05 AM »
After a bulging spinal disc and needing to replenish my motorcycle fund I am finally ready to start the rebuild.  I've got my table of parts all set out.


and starting tomorrow this empty cavity will start to get filled with throttle body, air box, new fuel hoses, new control cables, and repaired and replaced electrical wires and connectors.


First up will be connecting the clutch cable, throttle cable, and cold weather assist cable (choke) connected to the appropriate controls on the handle bars.  Then I'll start with the throttle body, fuel regulator, fuel hoses, and keep working my way up.  Then I plan on tackling the electrical wires and connectors.  Lastly I plan on replacing the radiator fan with a new Spal fan.

Wish me luck.
  • Central Valley California
  • 1993 BMW K75RT // 1982 Honda Nighthawk 650sc

Offline Laitch

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Re: Phoenix Rising - '93 K75RT Fire Recovery
« Reply #3 on: October 04, 2018, 08:56:30 AM »
How did you fasten the table to the wall? Did you use pushpins or duct tape to fasten the parts to the table?
  • Along the Ridley in Vermont.
  • 1995 K75T 68,000 miles
I wept because I had no radials until I met a man who had no splines.

Offline brichbk

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Re: Phoenix Rising - '93 K75RT Fire Recovery
« Reply #4 on: October 04, 2018, 11:47:27 AM »
How did you fasten the table to the wall? Did you use pushpins or duct tape to fasten the parts to the table?

good old JB Weld :P
  • Central Valley California
  • 1993 BMW K75RT // 1982 Honda Nighthawk 650sc

Offline brichbk

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Re: Phoenix Rising - '93 K75RT Fire Recovery
« Reply #5 on: October 04, 2018, 11:08:45 PM »
Throttle Cable Question:

I'm installing the new throttle cable and I'm thinking that the metal sleeve should fit inside the housing, but it doesn't seem to fit.  The old cable didn't go into the housing but I'm not sure if it was correct or not.  Is the grooved part in the picture supposed to fit inside the housing or does it just slide in like in the picture? 

  • Central Valley California
  • 1993 BMW K75RT // 1982 Honda Nighthawk 650sc

Offline johnny

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Re: Phoenix Rising - '93 K75RT Fire Recovery
« Reply #6 on: October 05, 2018, 09:37:59 AM »
greetings...

is the new cable oe bowden or other...

j o
  • i parks my 96 eleven hundert rs motobrick in dodge county cheezconsin...
:usa#1

Offline brichbk

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Re: Phoenix Rising - '93 K75RT Fire Recovery
« Reply #7 on: October 05, 2018, 10:17:01 AM »
greetings...

is the new cable oe bowden or other...

j o

I got it from my local BMW dealer and the tag says "Accelerator Bowden Cable".
  • Central Valley California
  • 1993 BMW K75RT // 1982 Honda Nighthawk 650sc

Offline Laitch

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Re: Phoenix Rising - '93 K75RT Fire Recovery
« Reply #8 on: October 05, 2018, 10:55:07 AM »
The flange of the sleeve is flush to the outside of the housing on my K75. Be certain you have the throttle tube gear and cable gear marks in alignment. What is the cable's part number? There are differing lengths for handlebar style.  32731457378 is for a high handlebar like yours appears to be.
  • Along the Ridley in Vermont.
  • 1995 K75T 68,000 miles
I wept because I had no radials until I met a man who had no splines.

Offline brichbk

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Re: Phoenix Rising - '93 K75RT Fire Recovery
« Reply #9 on: October 05, 2018, 02:55:14 PM »
The flange of the sleeve is flush to the outside of the housing on my K75. Be certain you have the throttle tube gear and cable gear marks in alignment. What is the cable's part number? There are differing lengths for handlebar style.  32731457378 is for a high handlebar like yours appears to be.

I double checked the part number and it was the correct cable and got the cable installed and adjusted.  Now on to the wiring fixes before I put all the hardware back in.
  • Central Valley California
  • 1993 BMW K75RT // 1982 Honda Nighthawk 650sc

Offline brichbk

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Re: Phoenix Rising - '93 K75RT Fire Recovery
« Reply #10 on: October 05, 2018, 03:50:06 PM »
Wire repair question:

I'm patching a good ignition coil wiring harness into my existing main wiring harness.  Each coil connector has a green/yellow wire (3 in total) and another color wire.  There are 8 total wires that need to be patched together (5 different colored wires and 3 green/yellow).  My question is this, does it matter which green/yellow wires are connected together as long as it is green/yellow to green/yellow?

Here is a pic of the wires alongside a picture of 2 of the 3 coil connectors.

  • Central Valley California
  • 1993 BMW K75RT // 1982 Honda Nighthawk 650sc

Offline Laitch

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Re: Phoenix Rising - '93 K75RT Fire Recovery
« Reply #11 on: October 05, 2018, 06:54:24 PM »
I double checked the part number and it was the correct cable and got the cable installed and adjusted.
Now that you have the cable installed and know the answer, perhaps you will answer here the question you asked here so you can help others who might come along with the same question.
  • Along the Ridley in Vermont.
  • 1995 K75T 68,000 miles
I wept because I had no radials until I met a man who had no splines.

Offline brichbk

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Re: Phoenix Rising - '93 K75RT Fire Recovery
« Reply #12 on: October 05, 2018, 08:13:09 PM »
Now that you have the cable installed and know the answer, perhaps you will answer here the question you asked here so you can help others who might come along with the same question.

Yes, it installs flush to the outside of the housing like you said.
  • Central Valley California
  • 1993 BMW K75RT // 1982 Honda Nighthawk 650sc

Offline brichbk

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Re: Phoenix Rising - '93 K75RT Fire Recovery
« Reply #13 on: October 06, 2018, 01:11:08 AM »
Wire repair question:

I'm patching a good ignition coil wiring harness into my existing main wiring harness.  Each coil connector has a green/yellow wire (3 in total) and another color wire.  There are 8 total wires that need to be patched together (5 different colored wires and 3 green/yellow).  My question is this, does it matter which green/yellow wires are connected together as long as it is green/yellow to green/yellow?

Here is a pic of the wires alongside a picture of 2 of the 3 coil connectors.



I looked at the wiring diagram in my Chlymers manual and for all versions of the K75 it shows the green/yellow wires all meeting up before going into the ignition module EXCEPT the K75 1990-On RT model diagram.  The RT model diagram shows the Green/Yellow wires as a black square (see pic below), what does that black square mean? 


  • Central Valley California
  • 1993 BMW K75RT // 1982 Honda Nighthawk 650sc

Offline Laitch

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Re: Phoenix Rising - '93 K75RT Fire Recovery
« Reply #14 on: October 06, 2018, 09:02:42 AM »
The RT model diagram shows the Green/Yellow wires as a black square (see pic below), what does that black square mean? 
In your diagram, the G/Y wires power the coils; the B/L, B/R and B/G wires trigger the coils and the second B/L wire on coil #1 sends impulses to the tachometer creating a rev count. The Br indicates ground connection. Each coil must have current supplied by a G/Y wire. To me, the black squares would indicate a connection terminal. 

In the attached diagram, the G/Y wires proceed to the coils from a junction—the black dot—as you have described from other diagrams.
There can be production variations.




  • Along the Ridley in Vermont.
  • 1995 K75T 68,000 miles
I wept because I had no radials until I met a man who had no splines.

Offline brichbk

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Re: Phoenix Rising - '93 K75RT Fire Recovery
« Reply #15 on: October 06, 2018, 03:33:03 PM »
In your diagram, the G/Y wires power the coils; the B/L, B/R and B/G wires trigger the coils and the second B/L wire on coil #1 sends impulses to the tachometer creating a rev count. The Br indicates ground connection. Each coil must have current supplied by a G/Y wire. To me, the black squares would indicate a connection terminal. 

In the attached diagram, the G/Y wires proceed to the coils from a junction—the black dot—as you have described from other diagrams.
There can be production variations.



Thanks Laitch. That was very helpful.  And exactly what I was hoping to hear.
  • Central Valley California
  • 1993 BMW K75RT // 1982 Honda Nighthawk 650sc

Offline brichbk

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Re: Phoenix Rising - '93 K75RT Fire Recovery
« Reply #16 on: October 06, 2018, 03:44:10 PM »
Finished up the electrical work on the FI harness and the main harness today. The only electrical I have left to work on is the ABS connection wire.





Up next is putting the throttle body, air plenum, air box, fuel rail, injectors,  oils, the FI wiring harness and new fuel lines.  Now to figure out what fuel lines connect to what.
  • Central Valley California
  • 1993 BMW K75RT // 1982 Honda Nighthawk 650sc

Offline brichbk

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Re: Phoenix Rising - '93 K75RT Fire Recovery
« Reply #17 on: October 07, 2018, 07:30:35 PM »
Where does this ground wire connect?  It looks to be about a 10 gauge wire. I can’t read the part number but it must be somewhere in the engine compartment area. Any ideas?

  • Central Valley California
  • 1993 BMW K75RT // 1982 Honda Nighthawk 650sc

Offline Laitch

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Re: Phoenix Rising - '93 K75RT Fire Recovery
« Reply #18 on: October 08, 2018, 02:12:48 PM »
Where does this ground wire connect?  . . . it must be somewhere in the engine compartment area. Any ideas?
That's a hard one, as the nun said to St. Peter at the Pearly Gates. I'd want to know where its other end attaches.
  • Along the Ridley in Vermont.
  • 1995 K75T 68,000 miles
I wept because I had no radials until I met a man who had no splines.

Offline brichbk

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Re: Phoenix Rising - '93 K75RT Fire Recovery
« Reply #19 on: October 08, 2018, 06:58:02 PM »
I checked the Max BMW parts fiche and I could not find where this cable connects. Here are a few ideas:
It connects from the starter to the battery
It connects from the coil bracket to the battery
It connects from the started to the coil bracket
It connects from the starter to the ?
It connects from the battery to the ?
It connects from the coil bracket to the ?

The only things that I removed that have mounting screws to metal are the coils, the starter cable on the starter terminal, and the battery. Everything else is made of plastic other than the fuel rail and I’m pretty sure the fuel rail doesn’t have a ground cable.


  • Central Valley California
  • 1993 BMW K75RT // 1982 Honda Nighthawk 650sc

Offline Laitch

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Re: Phoenix Rising - '93 K75RT Fire Recovery
« Reply #20 on: October 08, 2018, 07:15:15 PM »
How are you checking for continuity?
  • Along the Ridley in Vermont.
  • 1995 K75T 68,000 miles
I wept because I had no radials until I met a man who had no splines.

Offline bocutter Ed

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Re: Phoenix Rising - '93 K75RT Fire Recovery
« Reply #21 on: October 08, 2018, 07:24:36 PM »
"It connects from the battery to the ?"

Is that the battery to ground (transmission) cable?
  • Toronto, Canada
  • '61 Puch DS60 - '66 Puch 250 SGS - '87 BMW K75s

Offline brichbk

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Re: Phoenix Rising - '93 K75RT Fire Recovery
« Reply #22 on: October 08, 2018, 08:28:39 PM »
"It connects from the battery to the ?"

Is that the battery to ground (transmission) cable?

It is not the main ground. That cable is much bigger and still connected to the transmission. This one must be an alternate ground.
  • Central Valley California
  • 1993 BMW K75RT // 1982 Honda Nighthawk 650sc

Offline The Mighty Gryphon

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Re: Phoenix Rising - '93 K75RT Fire Recovery
« Reply #23 on: October 08, 2018, 10:52:58 PM »
I don't know if it is stock, but my K100RS has a ground cable from the battery negative terminal to the ground point under the tank along with the ground cable that goes to the transmission.

I'm not sure, it's been a long time, but my K75 RT may also have a ground from the battery negative to the point under the tank as well.
  • In my garage in Marilla, NY
  • '94 K75RT Mystic Red, '92K100RS White, '94 K75S Dakar Yellow
Current:
'94 K75RT "Ilsa, She Wolf of the SS"
'94 K75S "Cheetos"
'91 K100RS "Moby Brick Too

Offline brichbk

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Re: Phoenix Rising - '93 K75RT Fire Recovery
« Reply #24 on: October 09, 2018, 09:48:07 AM »
I don't know if it is stock, but my K100RS has a ground cable from the battery negative terminal to the ground point under the tank along with the ground cable that goes to the transmission.

I'm not sure, it's been a long time, but my K75 RT may also have a ground from the battery negative to the point under the tank as well.

I checked out the area  under my tank this morning.  I don't see anywhere that a ground cable would connect to.  I don't see any screws into the frame.  Any guesses on where under the tank it might connect to?
  • Central Valley California
  • 1993 BMW K75RT // 1982 Honda Nighthawk 650sc

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