« previous next »
Pages: [1]   Go Down

Author Topic: K5 Controls?  (Read 2570 times)

0 Members and 1 Guest are viewing this topic.

Offline sugarfinger

  • Full Member
  • *
  • Posts: 14
K5 Controls?
« on: May 22, 2012, 01:02:59 PM »
Apologies if this has been answered before but I cannot get the search to work.

I'm the proud owner of a new (to me) '75 CB750.  The PO had a few accessories that didn't fit my style so I'm in the process of modifying some things.  Here's where I am today:



I'm having a really hard time finding the left and right controls for this bike.  I have the stock ones and they worked but I'm redoing all of the wiring I'd like to find a set with the original wires in them (these appear to be re-wired and i don't have much length to work with).

I've seen a few on eBay but none that say they will work on my K5.  So..

Are there any sources besides eBay for these controls?

Are there any threads that cover rebuilding these controls?

Can someone rebuild these for me?

Thanks in advance!
Logged
1975 CB750

Offline CycleRanger

  • No comment about being an
  • Really Old Timer ...
  • *******
  • Posts: 5,801
  • Central Texas Shop Manual Advocate
Re: K5 Controls?
« Reply #1 on: May 22, 2012, 01:27:22 PM »
Left hand control should be the same for at least 73-76, I think. (72? had the buzzer off switch)
The correct '75 control is unique to that year in that it lacks the throttle "friction" adjust but still has an on/off switch for the headlight.
Toward the end of 75 they lose the on/off switch and the head light is always on.
I expect again that a 73-76 right hand control should work, some of the wires might be different colors.
For the best of everything I'd look for 73-74 controls.
Logged
Do you have a copy of the Honda Shop Manual or Parts List for your bike? Get one here:
https://www.honda4fun.com/materiale/documentazione-tecnica
CB750K5        '79 XL250s     CL350K3
CB750K3        '76 XS650      '76 CJ360T

Hinomaru

  • Guest
Re: K5 Controls?
« Reply #2 on: May 22, 2012, 05:29:45 PM »
Welcome to the forums.
 
To broaden your search for a correct replacement LH & RH 750 K5 switch assembly, note the other models that used the same part number:   
 
The 750 K5 LH switch (clutch) assembly part number is: 35200-374-671.
 
CB550 A MOTORCYCLE, JPN, VIN# CB550K-1000001
CB550K1 A MOTORCYCLE, JPN, VIN# CB550K-1200001
CB750K3 A MOTORCYCLE, JPN, VIN# CB750-2200001
CB750K4 A MOTORCYCLE, JPN, VIN# CB750-2300001
CB750K5 A MOTORCYCLE, JPN, VIN# CB750-2500001
 
The 750 K5 RH switch (throttle) assembly part number is: 35100-374-671.
 
CB550K1 A MOTORCYCLE, JPN, VIN# CB550K-1200001
CB750K5 A MOTORCYCLE, JPN, VIN# CB750-2500001

Logged

Offline OneWheelDrive

  • A journey of 1000 miles starts with your first carb overhaul.
  • Hot Shot
  • ***
  • Posts: 497
Re: K5 Controls?
« Reply #3 on: May 22, 2012, 05:32:32 PM »
SHHHHHH!!! Don't tell him!  I'm looking for the same controls  ;D
Logged
1975 CB550 cafe
1971 CB500 stocker
2008 Ducati Hypermotard 1100S *sold*
1973 CB350F *sold*
1975 CB550K Project "Keeper" *sold*
2010 Ducati Monster S4RS *sold*
1976 CB360T *sold*
1974 CB550K *sold*
1973 CB750K *sold*
1978 CB550K *sold*
2007 Vespa LX150 *sold*

Offline HondaMan

  • Someone took this pic of me before I became a
  • Really Old Timer ...
  • *******
  • Posts: 15,428
  • ...not my choice, I was nicknamed...
    • Getting 'em Back on the Road
Re: K5 Controls?
« Reply #4 on: May 22, 2012, 09:30:50 PM »
Technically speaking...you can make any year's controls work on any CB750. The only shortcoming is in one particular combination where you can't ever turn off the headlight (K4/5/6 right side w/o ON-OFF switch, and has 1-wire START button), but even this can be fixed up with one of my relay kits.  ;)
Logged
See SOHC4shop.com for info about the gadgets I make for these bikes.

The demons are repulsed when a man does good. Use that.
Blood is thicker than water, but motor oil is thicker yet...so, don't mess with my SOHC4, or I might have to hurt you.
Hondaman's creed: "Bikers are family. Treat them accordingly."

Link to Hondaman Ignition: http://forums.sohc4.net/index.php?topic=67543.0

Link to My CB750 Book: https://www.lulu.com/search?adult_audience_rating=00&page=1&pageSize=10&q=my+cb750+book
Link to My CB500/CB550 Book: https://www.lulu.com/search?sortBy=RELEVANCE&page=1&q=my+cb550+book&pageSize=10&adult_audience_rating=00
Link to website: https://sohc4shop.com/  (Note: no longer at www.SOHC4shop.com, moved off WWW. in 2024).

Offline Stev-o

  • Ain't no
  • Really Old Timer ...
  • *******
  • Posts: 35,228
  • Central Texas
Re: K5 Controls?
« Reply #5 on: May 23, 2012, 06:30:28 AM »
HM - my K4 has the on/off headlight switch on the right control.  Thought that was stock?
Logged
'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline sugarfinger

  • Full Member
  • *
  • Posts: 14
Re: K5 Controls?
« Reply #6 on: May 23, 2012, 08:47:38 AM »
Thanks for the responses.  Very helpful and much appreciated!

-Anthony
Logged
1975 CB750

Offline HondaMan

  • Someone took this pic of me before I became a
  • Really Old Timer ...
  • *******
  • Posts: 15,428
  • ...not my choice, I was nicknamed...
    • Getting 'em Back on the Road
Re: K5 Controls?
« Reply #7 on: May 23, 2012, 11:16:14 AM »
Quote from: Stev-o on May 23, 2012, 06:30:28 AM
HM - my K4 has the on/off headlight switch on the right control.  Thought that was stock?

The K4 built in the Old Factory had the ON-OFF switch on the right side, while the K3-K6 of the New Factory came with no ON-OFF switch at all. That's why we find both types today, and the wiring harnesses are the same: the New Factory bikes often have little White, Orange, Yellow, or Blue collars on Black, Brown, or Black-White wires to indicate the way they were patched together. You'll see these in the headlight buckets if you work on enough of them. ;)
Logged
See SOHC4shop.com for info about the gadgets I make for these bikes.

The demons are repulsed when a man does good. Use that.
Blood is thicker than water, but motor oil is thicker yet...so, don't mess with my SOHC4, or I might have to hurt you.
Hondaman's creed: "Bikers are family. Treat them accordingly."

Link to Hondaman Ignition: http://forums.sohc4.net/index.php?topic=67543.0

Link to My CB750 Book: https://www.lulu.com/search?adult_audience_rating=00&page=1&pageSize=10&q=my+cb750+book
Link to My CB500/CB550 Book: https://www.lulu.com/search?sortBy=RELEVANCE&page=1&q=my+cb550+book&pageSize=10&adult_audience_rating=00
Link to website: https://sohc4shop.com/  (Note: no longer at www.SOHC4shop.com, moved off WWW. in 2024).

Offline Stev-o

  • Ain't no
  • Really Old Timer ...
  • *******
  • Posts: 35,228
  • Central Texas
Re: K5 Controls?
« Reply #8 on: May 23, 2012, 03:34:40 PM »
Quote from: HondaMan on May 23, 2012, 11:16:14 AM
Quote from: Stev-o on May 23, 2012, 06:30:28 AM
HM - my K4 has the on/off headlight switch on the right control.  Thought that was stock?

The K4 built in the Old Factory had the ON-OFF switch on the right side, while the K3-K6 of the New Factory came with no ON-OFF switch at all. That's why we find both types today, and the wiring harnesses are the same: the New Factory bikes often have little White, Orange, Yellow, or Blue collars on Black, Brown, or Black-White wires to indicate the way they were patched together. You'll see these in the headlight buckets if you work on enough of them. ;)

Interesting.  Thx for the info.
Logged
'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline bikerbart

  • Master
  • *****
  • Posts: 1,578
Re: K5 Controls?
« Reply #9 on: May 23, 2012, 08:32:41 PM »
speaking of,I have a 72cb750,but my right control is toast,I have another control in my parts box that is nice,not corroded,but it has only the on/off kill switch,start button and thats about it.Can I use it??The wires that are common are the 2 blacks,Bl/wh,yel/red.I can make it work right??
Logged
its better to regret something you have done,than something you havent.Except playing with explosives.

Offline HondaMan

  • Someone took this pic of me before I became a
  • Really Old Timer ...
  • *******
  • Posts: 15,428
  • ...not my choice, I was nicknamed...
    • Getting 'em Back on the Road
Re: K5 Controls?
« Reply #10 on: May 23, 2012, 11:04:41 PM »
Quote from: bikerbart on May 23, 2012, 08:32:41 PM
speaking of,I have a 72cb750,but my right control is toast,I have another control in my parts box that is nice,not corroded,but it has only the on/off kill switch,start button and thats about it.Can I use it??The wires that are common are the 2 blacks,Bl/wh,yel/red.I can make it work right??

Sure: that one is one of the late K4 and K5 types, most likely. If you install a small relay on the Yel/Red wire, it can drop out the headlight during START, which will help the battery. The START button in that one is more complex than the K2: you need to determine which of those BLACK wires is feeding it, and connect it to GREEN in the headlight instead of BLACK, to make the START solenoid turn on. Or, you can just follow the matching wire colors in the headlight, but reconnect the non-Yellow wire at the START solenoid to GREEN (under the seat is a spare GREEN) instead: either method will work fine. The KILL swithc is the same on both.way
Logged
See SOHC4shop.com for info about the gadgets I make for these bikes.

The demons are repulsed when a man does good. Use that.
Blood is thicker than water, but motor oil is thicker yet...so, don't mess with my SOHC4, or I might have to hurt you.
Hondaman's creed: "Bikers are family. Treat them accordingly."

Link to Hondaman Ignition: http://forums.sohc4.net/index.php?topic=67543.0

Link to My CB750 Book: https://www.lulu.com/search?adult_audience_rating=00&page=1&pageSize=10&q=my+cb750+book
Link to My CB500/CB550 Book: https://www.lulu.com/search?sortBy=RELEVANCE&page=1&q=my+cb550+book&pageSize=10&adult_audience_rating=00
Link to website: https://sohc4shop.com/  (Note: no longer at www.SOHC4shop.com, moved off WWW. in 2024).

Offline bikerbart

  • Master
  • *****
  • Posts: 1,578
Re: K5 Controls?
« Reply #11 on: May 24, 2012, 07:04:52 AM »
awesome Hman,thanks again.I love your book by the way,I'm sure its in there as well.sometimes having one explain it in laymans terms helps.Its too bad my original one is toast.
Logged
its better to regret something you have done,than something you havent.Except playing with explosives.

Offline HondaMan

  • Someone took this pic of me before I became a
  • Really Old Timer ...
  • *******
  • Posts: 15,428
  • ...not my choice, I was nicknamed...
    • Getting 'em Back on the Road
Re: K5 Controls?
« Reply #12 on: May 24, 2012, 09:19:39 PM »
Quote from: bikerbart on May 24, 2012, 07:04:52 AM
awesome Hman,thanks again.I love your book by the way,I'm sure its in there as well.sometimes having one explain it in laymans terms helps.Its too bad my original one is toast.

Take a look in the Electrical Section: it details how to do what I described above.
Logged
See SOHC4shop.com for info about the gadgets I make for these bikes.

The demons are repulsed when a man does good. Use that.
Blood is thicker than water, but motor oil is thicker yet...so, don't mess with my SOHC4, or I might have to hurt you.
Hondaman's creed: "Bikers are family. Treat them accordingly."

Link to Hondaman Ignition: http://forums.sohc4.net/index.php?topic=67543.0

Link to My CB750 Book: https://www.lulu.com/search?adult_audience_rating=00&page=1&pageSize=10&q=my+cb750+book
Link to My CB500/CB550 Book: https://www.lulu.com/search?sortBy=RELEVANCE&page=1&q=my+cb550+book&pageSize=10&adult_audience_rating=00
Link to website: https://sohc4shop.com/  (Note: no longer at www.SOHC4shop.com, moved off WWW. in 2024).

Offline sugarfinger

  • Full Member
  • *
  • Posts: 14
Re: K5 Controls?
« Reply #13 on: July 14, 2012, 12:53:40 PM »
Quote from: HondaMan on May 22, 2012, 09:30:50 PM
Technically speaking...you can make any year's controls work on any CB750. The only shortcoming is in one particular combination where you can't ever turn off the headlight (K4/5/6 right side w/o ON-OFF switch, and has 1-wire START button), but even this can be fixed up with one of my relay kits.  ;)

So here's an update:

I installed a new harness from CB750 Supply (I think) and a right control from what looks to be from a K6.  My original K5 right control was the one with the headlight on/off switch.  The new one only has the run/off/run and a start button.  I should also mention I have aftermarket turn signals and an aftermarket taillight.  To my knowledge, everything else is stock.

I'm not sure where to plug in the wires from the K6 switch. The switch has RED/YELLOW, BLK/WHT, 2 BLACK, and a BLK/RED.  I've tried different combos but I'm getting the same result:

When I turn the key, the starter motor immediately turns on.  If I hold the starter button in then turn the key, my main fuse blows. 

I've followed my Clymer manual for all of the other wiring.  I've inspected the ignition and fusebox and everything looks good.  I also cleaned the fuse clips.  I should also mention that the fuses I have are the correct amps (5, 7, 15) but they are longer than the originals.

Please let me know if I've left any critical information out... electrical is like black magic to me and I foolishly assumed it would be as easy as matching the colors up.  I wanna ride  :(

Any thoughts?
Logged
1975 CB750

Offline Really?

  • I've come to the conclusion that I AM a
  • Really Old Timer ...
  • *******
  • Posts: 5,303
K5 Controls?
« Reply #14 on: July 14, 2012, 01:24:41 PM »
I have an on/off switch on the K5. Maybe came from another bike. Love that switch!
Logged
I don't have a motorcycle, sold it ('85 Yamaha Venture Royale).  Haven't had a CB750 for over 40 years.

The Wife's Bike - 750K5
The Kid's Bike - 750K3

Offline DJ_AX

  • Expert
  • ****
  • Posts: 1,279
  • ?!
Re: K5 Controls?
« Reply #15 on: July 14, 2012, 02:29:08 PM »
Quote from: Really? on July 14, 2012, 01:24:41 PM
I have an on/off switch on the K5. Maybe came from another bike. Love that switch!
Mine too. :)
Logged
~ Vincent . . . '75 CB750 K5 . . . '97 BMW r1100rt . . . had; '75 CB550 K1 (sold) . . .  '73 CB350G (gifted) HELL YEAH!
Disclaimer: I could be wrong. :)

Offline sugarfinger

  • Full Member
  • *
  • Posts: 14
Re: K5 Controls?
« Reply #16 on: July 15, 2012, 02:31:50 PM »
I decided to rewire my K5 right hand control... The one with the headlamp on/off.  Everything on the bike appears to be wired corectly but I'm still having the same problem: when I turn the key to the first position, the starter starts cranking.

Anybody know what could be causing this?
Logged
1975 CB750
Pages: [1]   Go Up
« previous next »