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Author Topic: Just picked up a K75 - need input on the plan of attack  (Read 42508 times)

Offline Martin

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Re: Just picked up a K75 - need input on the plan of attack
« Reply #75 on: July 05, 2018, 12:48:14 AM »
Unfortunately no. They do however have rear master cylinder that require very little in the way of modification. Extremely expensive $13.33 Au a few inmates are running them and the general consensus is they have a better feel than OEM.
See http://www.motobrick.com/index.php/topic,9364.msg90596.html#msg90596 I've also been running a Chinese motorcycle GPS.
See http://www.motobrick.com/index.php/topic,7975.msg79503.html#msg79503 I have tried a Aliexpress Chinese temperature sensor which turned out to not be compatible with the Brick.


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

Offline oneplustwo

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  • Posts: 109
Re: Just picked up a K75 - need input on the plan of attack
« Reply #76 on: July 05, 2018, 02:01:52 PM »
Hmm... I might need to do some soldering surgery on my old sender unit then.  I'm going to eliminate the fuel level bits anyway.  But I certainly still need power to the fuel pump!  Looks like I can reuse most everything else.  Only thing I'm going to replace beyond the pump itself is the hoses.  The Gates hose seems to be a good if not cheap choice: https://www.amazon.com/gp/product/B001R5XSGU/ref=ox_sc_act_title_1?smid=ATVPDKIKX0DER&psc=1

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  • San Francisco
  • 1990 K75S (in 1000 pieces)

Offline Martin

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Re: Just picked up a K75 - need input on the plan of attack
« Reply #77 on: July 05, 2018, 04:38:41 PM »
The four pin connector that supplies power to the fuel pump is a known source of problems. You can wait for it to start playing up or you can replace it now and not have any problems. :dunno I replaced mine with a waterproof one after it started to play up, and continued to play up even after a couple of applications of DeoxIT.
Regards Martin.
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  • North Lakes Queensland Australia
  • 1992 K75s Hybrid, Lefaux, Vespa V twin.

Offline oneplustwo

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Re: Just picked up a K75 - need input on the plan of attack
« Reply #78 on: July 05, 2018, 04:47:39 PM »
Good to know. I’ll check the continuity when I’m done. It seems to be in decent shape but it wouldn’t be hard to put a new connector on there.  I should have taken a photo but it’s the yellow and brown wires I think I need yes?  Yellow is 12V and brown is ground?  I’ll check the schematic to confirm.
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  • San Francisco
  • 1990 K75S (in 1000 pieces)

Offline rbm

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Re: Just picked up a K75 - need input on the plan of attack
« Reply #79 on: July 05, 2018, 05:06:12 PM »
Yellow is fuel level, brown is ground, green/white is 12V, white is 4L reserve indicator
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  • Regards, Robert
Toronto, Ontario

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

Offline oneplustwo

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Re: Just picked up a K75 - need input on the plan of attack
« Reply #80 on: July 05, 2018, 05:31:38 PM »
Ah, I see now.  I was confused as the wires to the pump itself are yellow and black.  I may have all new wires going to this with the motogadget re-wire process anyway but I might reuse some of the wires and connectors so good to know!
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  • San Francisco
  • 1990 K75S (in 1000 pieces)

Offline oneplustwo

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Re: Just picked up a K75 - need input on the plan of attack
« Reply #81 on: July 06, 2018, 03:25:00 AM »
I'm debating between painting my wheels and the frame a matching color (black or blue) or keeping the frame black and just cleaning the wheels up and leaving them bare aluminum.  Any thoughts or inspirational bikes you all love that I could consider?  I've spent a long time looking at cafe racers and most of them are black on black.  Some have silver/bare wheels.  And few having wheel/frame matching non-black.

I've painted the forks, front fender, and foot peg brackets a satin black thus far.
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  • San Francisco
  • 1990 K75S (in 1000 pieces)

Offline DEcosse

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Re: Just picked up a K75 - need input on the plan of attack
« Reply #82 on: July 10, 2018, 09:29:08 PM »
Quote from: rbm on July 05, 2018, 05:06:12 PM
Yellow is fuel level, brown is ground, green/white is 12V, white is 4L reserve indicator

Can you clarify please?
Per this EXCELLENT article you authored -  http://www.k100-forum.com/t9265-messing-with-the-in-tank-fuel-sender - it suggests at very end of that, the White wire is the varying resistance level ...

Quote
Place one probe on the frame and the other on the white wire.  When you move the float assembly arm, the resistance should change between these values.  You will find that the resistance will now be about 2 Ohms with no fuel and about 130 Ohms with a full tank.
In that article was that 'white' a typo?
Looking at schematic it would appear that the white is as you state above low level to the main instrument while the yellow goes off to the auxiliary instrument connector which I presume includes a fuel gauge that indicates actual level vs just a 'low' threshold - do I have that right?
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  • CA, USA
  • Triumph Daytona 955

Offline rbm

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Re: Just picked up a K75 - need input on the plan of attack
« Reply #83 on: July 10, 2018, 10:55:40 PM »
yes, typo.
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  • Regards, Robert
Toronto, Ontario

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

  • Faster than a speeding pullet
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Re: Just picked up a K75 - need input on the plan of attack
« Reply #84 on: July 10, 2018, 11:21:04 PM »
Quote from: oneplustwo on July 06, 2018, 03:25:00 AM
I'm debating between painting my wheels and the frame a matching color (black or blue) or keeping the frame black and just cleaning the wheels up and leaving them bare aluminum.  Any thoughts or inspirational bikes you all love that I could consider? . . .
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  • Along the Ridley in Vermont.
  • 1995 K75 89,000 miles

Offline oneplustwo

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Re: Just picked up a K75 - need input on the plan of attack
« Reply #85 on: July 10, 2018, 11:25:43 PM »
What the hell?
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  • San Francisco
  • 1990 K75S (in 1000 pieces)

Offline Martin

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Re: Just picked up a K75 - need input on the plan of attack
« Reply #86 on: July 10, 2018, 11:35:55 PM »
You do get a pair of clown shoes and a red nose to go with the bike. :hehehe
Regards Martin.
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  • North Lakes Queensland Australia
  • 1992 K75s Hybrid, Lefaux, Vespa V twin.

Offline Laitch

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Re: Just picked up a K75 - need input on the plan of attack
« Reply #87 on: July 11, 2018, 07:24:41 AM »
Quote from: oneplustwo on July 10, 2018, 11:25:43 PM
What the hell?
You don't need to copy that exactly. Substitute fuscia for the blue and match the fenders with it.
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  • Along the Ridley in Vermont.
  • 1995 K75 89,000 miles

Offline oneplustwo

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Re: Just picked up a K75 - need input on the plan of attack
« Reply #88 on: July 11, 2018, 11:19:28 AM »
I kinda dig the minimalist ideas although they are extreme. The color scheme is so weird though. Especially given the mechanical decisions. Is there an article or forum with more details on the build?
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  • San Francisco
  • 1990 K75S (in 1000 pieces)

Offline Laitch

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Re: Just picked up a K75 - need input on the plan of attack
« Reply #89 on: July 11, 2018, 11:49:45 AM »
Quote from: oneplustwo on July 11, 2018, 11:19:28 AM
Especially given the mechanical decisions. Is there an article or forum with more details on the build?
The color scheme seems weird to you?

It was one of a couple of builds offered on Craigslist a couple of years ago. The builder had resided in Florida at the time of sale. There might be more information out there somewhere.
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  • Along the Ridley in Vermont.
  • 1995 K75 89,000 miles

Offline oneplustwo

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  • Posts: 109
Re: Just picked up a K75 - need input on the plan of attack
« Reply #90 on: July 14, 2018, 10:45:39 PM »
Saddle came today. Trying to figure out the best way to cut and reweld or maybe braze the the pieces together. Two options I see are to cut at the part where the frame tube diameter decreases and weld that to the section that is trimmed at the other side. Other option is to cut at the larger diameter tube and perhaps find a piece to fit inside and braze everything together. I have experience silver brazing lugged bicycle frames so it would be like that.

Any other ideas or opinions?
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  • San Francisco
  • 1990 K75S (in 1000 pieces)

Offline oneplustwo

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  • Posts: 109
Re: Just picked up a K75 - need input on the plan of attack
« Reply #91 on: July 22, 2018, 11:58:02 PM »
I followed advice from DJewen's thread to chop the frame.  Basically, I just measured how much needed to be trimmed (195mm in my case) taped the cut lines, and went to town with a portable band saw.  Once cut, I just got two socket extensions in the open ends and just hand bent the U about 10mm to match up with the other end of the frame.  I've cut most of the other tabs and such off now.  Still need to trim the shock mount and grind down a few other bits.  And I need to cut a channel for my tail light/turn signal strip.  But then I should be ready to tack and mig the pieces together.
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  • San Francisco
  • 1990 K75S (in 1000 pieces)

Offline oneplustwo

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Re: Just picked up a K75 - need input on the plan of attack
« Reply #92 on: July 24, 2018, 11:06:35 PM »
Fuel pump came from China today. Fits like a glove. And came with these little connector boots. Any reason not to use them?
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  • San Francisco
  • 1990 K75S (in 1000 pieces)

Offline The Mighty Gryphon

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Re: Just picked up a K75 - need input on the plan of attack
« Reply #93 on: July 24, 2018, 11:10:28 PM »
I would expect the corn will turn them into a gooey mess in a year or two, maybe sooner.
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  • In my garage in Marilla, NY
  • '91K100RS White/Blue
Current:
'91 K100RS16V "Moby Brick Too"

Past:
'94 K75RT "Ilsa, She Wolf of the SS"
'92 K100RS16V "Moby Brick" (RIP, deceased in a vehicular assault)
'94 K75S Special Edition Dakar Yellow "Cheetos"
'89 K100RS Special Edition "Special Ed"

Offline Martin

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Re: Just picked up a K75 - need input on the plan of attack
« Reply #94 on: July 25, 2018, 12:44:36 AM »
I wouldn't bother not needed and as Gryph said will probably turn to goo. As an experiment put some corn gas in one jar and non corn gas in another jar pop a boot in each and report what happens. What was the name of your Chinese supplier for future reference, and could you please post a picture of your pumps intake.
Regards Martin.
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  • North Lakes Queensland Australia
  • 1992 K75s Hybrid, Lefaux, Vespa V twin.

Offline oneplustwo

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  • Posts: 109
Re: Just picked up a K75 - need input on the plan of attack
« Reply #95 on: August 04, 2018, 05:46:23 PM »
Welded and ready for paint.  Might need a little bondo first... I'm still a welding novice!
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  • San Francisco
  • 1990 K75S (in 1000 pieces)

Offline bartan

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  • Posts: 4
Re: Just picked up a K75 - need input on the plan of attack
« Reply #96 on: August 06, 2018, 02:16:28 AM »
Woow seat looks  soo nice,   Where did you buy it ?  any links ?

Bartan


Quote from: oneplustwo on August 04, 2018, 05:46:23 PM
Welded and ready for paint.  Might need a little bondo first... I'm still a welding novice!
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  • Los angeles
  • K75

Offline oneplustwo

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  • Posts: 109
Re: Just picked up a K75 - need input on the plan of attack
« Reply #97 on: August 06, 2018, 01:00:06 PM »
http://www.texavina.com/

The quality is pretty good for the price. I wanted real leather but again, for the price, can't go wrong.
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  • San Francisco
  • 1990 K75S (in 1000 pieces)

Offline oneplustwo

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  • Posts: 109
Re: Just picked up a K75 - need input on the plan of attack
« Reply #98 on: December 06, 2018, 04:53:30 PM »
Got busy for a while but got a little done recently.

Painted the frame.
Intake back on with some new clamps from McMaster Carr.
Swingarm and wheel back on.
Forks and front wheel on with bars mocked up.
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  • San Francisco
  • 1990 K75S (in 1000 pieces)

Offline oneplustwo

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  • Posts: 109
Re: Just picked up a K75 - need input on the plan of attack
« Reply #99 on: December 06, 2018, 04:56:08 PM »
Anyone have a favorite resource for rewiring?  I'm using the motogadget m-unit, their wiring kit, and their tiny bar gauge.  So lots to redo.  Already have the schematics, just thinking about the bigger picture...
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  • San Francisco
  • 1990 K75S (in 1000 pieces)
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