Author Topic: Starting the research on R80 and K75  (Read 3657 times)

Offline blackie1

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  • Posts: 148
  • christchurch nz
Re: Starting the research on R80 and K75
« Reply #50 on: July 18, 2018, 02:57:49 AM »
brake pads are cheap and easy to replace
  • new zealand , where else would u want to live, really
  • 1991 K75RT naked 40,000kms

Offline Chaos

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Re: Starting the research on R80 and K75
« Reply #51 on: July 18, 2018, 09:39:30 AM »
mine got down to 3.3mm  :yow
  • sw ohio
1987 K75S    VIN 0231
Original owner, Original litter
200,000 miles (plus or minus) and 5 paint jobs
2012 Ural 2WD sidecar (BMW's bastard step child)

Offline Gibson

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Re: Starting the research on R80 and K75
« Reply #52 on: July 18, 2018, 09:52:24 AM »
Yep 4mm. How many miles on it? Rotors should be good for 70-80K miles or more.
  • Dix Hills NY
  • K75 ABS and R100Mystic

Offline johnny

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Re: Starting the research on R80 and K75
« Reply #53 on: July 18, 2018, 10:07:51 AM »
greetings...

i took my motoheap to a socal dealer for their $30 oil change and moto warsh...

after i paid they told me they could not release my brick to me eithout new disks because my disks were at 2.5mm and not roadworthy...

i caught a ride to fetch my spare key... returned and stole my own moto...

those disks are 2mm now and brake like a moe...

f the booshee and ride...

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

Offline Adam M

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Re: Starting the research on R80 and K75
« Reply #54 on: July 18, 2018, 10:10:54 AM »
Another question, were electronic circuit board is located ?
Have impression that it was deleted too.
Bike has 80k km on it, but could be 180 k as well.
However current owner looks trustworthy to me and bike looks very good and in constant use.
  • Canada
  • Triumph T 150 Trident.

Offline Adam M

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Re: Starting the research on R80 and K75
« Reply #55 on: July 18, 2018, 10:13:11 AM »
John, I'll use your advice when bike is in my possession during the weekend :).
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Offline Gibson

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Re: Starting the research on R80 and K75
« Reply #56 on: July 18, 2018, 10:24:07 AM »
No doubt you need rotors with that crack, :nono looks dangerous....
  • Dix Hills NY
  • K75 ABS and R100Mystic

Offline Chaos

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Re: Starting the research on R80 and K75
« Reply #57 on: July 18, 2018, 12:35:09 PM »
Yep 4mm. How many miles on it? Rotors should be good for 70-80K miles or more.

Those were my 2nd set, both went about 95k, replaced them with EBC rotors this time around. 
  • sw ohio
1987 K75S    VIN 0231
Original owner, Original litter
200,000 miles (plus or minus) and 5 paint jobs
2012 Ural 2WD sidecar (BMW's bastard step child)

Offline Chaos

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Re: Starting the research on R80 and K75
« Reply #58 on: July 18, 2018, 12:49:51 PM »
greetings...

i took my motoheap to a socal dealer for their $30 oil change and moto warsh...

j o

$30  ool change from a dealer?  Hell, that's a ploy to get you in there so they can riffle through you saddlebags and find incriminating evidence to extort $3875 tune up from you :deal:
  • sw ohio
1987 K75S    VIN 0231
Original owner, Original litter
200,000 miles (plus or minus) and 5 paint jobs
2012 Ural 2WD sidecar (BMW's bastard step child)

Online rbm

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Re: Starting the research on R80 and K75
« Reply #59 on: July 18, 2018, 03:42:32 PM »
Another question, were electronic circuit board is located ?
Which circuit boards are you referring?  If its the ABS, the circuits are in the tail of the bike.
  • Regards, Robert
Toronto, Ontario

1987 K75 - Build Blog @http://k75retro.blogspot.ca/

Offline Adam M

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Re: Starting the research on R80 and K75
« Reply #60 on: July 18, 2018, 03:47:50 PM »
The board controlling all the lights, blinkers and tells you a bulb is broken :).
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  • Triumph T 150 Trident.

Online Laitch

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Re: Starting the research on R80 and K75
« Reply #61 on: July 18, 2018, 03:59:07 PM »
Bike has 80k km on it, but could be 180 k as well.
It could be, but if it has been operating accurately, its odometer should read something like 080000. The main odometer on classic K-bike Motometers records miles/kilometers six places left of decimal.
  • 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 Gibson

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Re: Starting the research on R80 and K75
« Reply #62 on: July 18, 2018, 04:10:35 PM »
I still have 2 zeros all the way to the left. I have a way to go I guess... :riding:
  • Dix Hills NY
  • K75 ABS and R100Mystic

Online rbm

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Re: Starting the research on R80 and K75
« Reply #63 on: July 18, 2018, 04:39:02 PM »
The board controlling all the lights, blinkers and tells you a bulb is broken :).
Most lights (headlight, high beam, parking) are wired directly through switches. The brake and rear running light is wired through the Bulb Monitoring Unit (BMU) located in the relay box under the tank.  Signals are managed by the Flasher module, also located under the tank.

Other circuits such as neutral detect, speedometer, tachometer, clock and gear indicator are located in the instrument cluster.
  • Regards, Robert
Toronto, Ontario

1987 K75 - Build Blog @http://k75retro.blogspot.ca/

Offline Adam M

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Re: Starting the research on R80 and K75
« Reply #64 on: July 18, 2018, 09:39:48 PM »
So I went for a ride and was really impressed with the bike behavior with 2 exceptions :
 - instruments in the faring were dancing furiously all the time,
 - guttural vibration was slightly felt with speed 60 - 80 km/h but became really intrusive to the point of a strong feel even in the handlebar around 100 - 120 km/h
Bike was dropped in the past, tank was painted and faring has a slight crack in the left side touching tank.
My question is - could this kind of vibration be caused by lets say any imbalance in throttles, dirty injectors or faulty ignition set up, or something got really screwed during motorcycle drop. I suspected one of the crank bearings going out, but oil pressure lamp showed on turned of engine and never came back during a ride.
  • Canada
  • Triumph T 150 Trident.

Online rbm

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Re: Starting the research on R80 and K75
« Reply #65 on: July 18, 2018, 10:08:23 PM »
IMO,  K75's should not vibrate the way you describe.  Something's up with that.  How pronounced were the vibrations?  Were the vibrations in sympathy with the engine speed or the road speed?

The dancing instruments is peculiar as well.
  • Regards, Robert
Toronto, Ontario

1987 K75 - Build Blog @http://k75retro.blogspot.ca/

Offline Adam M

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Re: Starting the research on R80 and K75
« Reply #66 on: July 18, 2018, 10:17:50 PM »
Definitely with engine speed, after you pull the clutch everything went away. I didn't look at tacho, but I believe 100 km/h was around 4000 rpm ?
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  • Triumph T 150 Trident.

Offline Adam M

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Re: Starting the research on R80 and K75
« Reply #67 on: July 18, 2018, 10:54:49 PM »
No, it's not true - I just realized I only pulled the clutch changing gears and didn't do it going on 404 at 100 km/h.
So it could be a bearing in the tranny.
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Online Laitch

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Re: Starting the research on R80 and K75
« Reply #68 on: July 18, 2018, 11:03:04 PM »
I suspected one of the crank bearings going out, but oil pressure lamp showed on turned of engine and never came back during a ride.
No, it's not true - I just realized I only pulled the clutch changing gears and didn't do it going on 404 at 100 km/h.
So it could be a bearing in the tranny.
Golly! The sky is falling! The bearings are ok. I can see their aura from here—a soothing mint green.

Because it's a neglected K75S, it needs its fairing fittings tightened, a dose of stuff the monkey and probably a tune up. Bad bearings would be a bonus.
  • 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.

Online Laitch

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Re: Starting the research on R80 and K75
« Reply #69 on: July 18, 2018, 11:24:24 PM »
Here's another thread that might interest you, Adam.
  • 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 blackie1

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  • Posts: 148
  • christchurch nz
Re: Starting the research on R80 and K75
« Reply #70 on: July 19, 2018, 12:50:32 AM »
the instrument cluster shake appears to be across the entire family to some degree.
you will be used to it before you know it.

http://www.motobrick.com/index.php/topic,9185.msg73158.html#msg73158

plenty of threads discuss this
  • new zealand , where else would u want to live, really
  • 1991 K75RT naked 40,000kms

Offline Martin

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Re: Starting the research on R80 and K75
« Reply #71 on: July 19, 2018, 01:35:25 AM »
Once you synchronize your head shake with the instrument shake you won't even notice it.  :hehehe
Regards Martin.
  • North Lakes Queensland Australia
  • 1992 K75s Hybrid, Lefaux, Vespa V twin.

Offline johnny

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Re: Starting the research on R80 and K75
« Reply #72 on: July 19, 2018, 04:24:19 AM »
greetings...

trans needs a valve job... do you have shems...

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

Offline Adam M

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Re: Starting the research on R80 and K75
« Reply #73 on: July 19, 2018, 05:38:39 PM »
Seller called me today telling me his throttle bodys were way off and he corrected them.
Vibration subsided, he was able to take a bike to 160  km/h, but was still there.
I suggested my suspicion about gearbox / final drive bearing being on the way out and he confirmed the possibility
with his buddy ( head of BMW service in one of Toronto dealerships ).
He decided to take final drive, shaft and gearbox off to find out if this could be a culprit.
Will give me a message during this coming weekend.
  • Canada
  • Triumph T 150 Trident.

Online Laitch

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Re: Starting the research on R80 and K75
« Reply #74 on: July 19, 2018, 06:15:40 PM »
Seller called me today telling me his throttle bodys were way off and he corrected them.
Vibration subsided, he was able to take a bike to 160  km/h, but was still there
He decided to take final drive, shaft and gearbox off to find out if this could be a culprit.
Will give me a message during this coming weekend.
This seller seems unusually accommodating. I hope this works out for both of you.
  • 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.

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