Author Topic: starter motor reconditioning  (Read 1206 times)

0 Members and 1 Guest are viewing this topic.

Offline _mark

  • Enthusiast
  • **
  • Posts: 183
starter motor reconditioning
« on: June 13, 2021, 07:04:09 AM »
Hi guys. The power cable that goes to the starter motor is in very bad state. Anyone tried to change it ?
I don't know how to fix the end to the casing...



Thanks and Regards.




Online 69cb750

  • Expert
  • ****
  • Posts: 1,229
Re: starter motor reconditioning
« Reply #1 on: June 13, 2021, 08:53:44 AM »
Normal, nothing wrong.

Offline fantino

  • Hot Shot
  • ***
  • Posts: 321
Re: starter motor reconditioning
« Reply #2 on: June 13, 2021, 07:15:44 PM »
My cable was very frayed and in tough shape overall, so I desoldered the connection when I rebuilt my starter and put in a stud bolt instead. I’m running new 6Ga flexible welding cable with a crimp ring terminal for the hookup.


Offline Alan F.

  • We remember the Night Rider, and we know who you are.
  • Really Old Timer ...
  • *******
  • Posts: 7,351
Re: starter motor reconditioning
« Reply #3 on: June 13, 2021, 07:19:31 PM »
That's cool Fantino, I'm glad to hear that's a possibility for these starters.
Thanks!

Offline _mark

  • Enthusiast
  • **
  • Posts: 183
Re: starter motor reconditioning
« Reply #4 on: June 13, 2021, 11:09:20 PM »
My cable was very frayed and in tough shape overall, so I desoldered the connection when I rebuilt my starter and put in a stud bolt instead. I’m running new 6Ga flexible welding cable with a crimp ring terminal for the hookup.


Thanks. Did you mantained the old isolating ring around the stud ? or you replaced it with something else? how did you managed to block the stud from internal side if the space is so inner? Thanks

Offline fantino

  • Hot Shot
  • ***
  • Posts: 321
Re: starter motor reconditioning
« Reply #5 on: June 14, 2021, 01:02:54 AM »
I kept the phenolic insulator. After the solder and old wire is removed, the spacer can split into two pieces with a flange on the either side (if I recall correctly…). The internal field coil connection is an integral copper ring terminal that fits a 1/4” or 6mm bolt. I used a low head hex socket bolt and shaved a little off the head for adequate clearance, then a thin nut on the outside to clamp everything together. A button head may also work.

I had to replace the stud with a longer one than shown in that pic, it didn’t have quite enough thread engagement with the cable ring terminal installed.
« Last Edit: June 14, 2021, 01:10:23 AM by fantino »

Offline _mark

  • Enthusiast
  • **
  • Posts: 183
Re: starter motor reconditioning
« Reply #6 on: June 22, 2021, 10:02:02 AM »
Thanks. I did  it.

Offline grcamna2

  • Not a
  • Really Old Timer ...
  • *******
  • Posts: 15,181
  • I love to restore & travel. Keep'em Going Strong !
Re: starter motor reconditioning
« Reply #7 on: June 22, 2021, 10:45:53 AM »
That's an excellent fix  :)
75' CB400F/'bunch o' parts' & 81' CB125S modded to a 'CB200S'
  I love the small ones too !
Do your BEST...nobody can take that away from you.

Offline Alan F.

  • We remember the Night Rider, and we know who you are.
  • Really Old Timer ...
  • *******
  • Posts: 7,351
Re: starter motor reconditioning
« Reply #8 on: June 22, 2021, 06:41:08 PM »
Looks good _Mark, anything to add to what Fantino said?

Offline _mark

  • Enthusiast
  • **
  • Posts: 183
Re: starter motor reconditioning
« Reply #9 on: June 23, 2021, 08:17:17 AM »
Looks good _Mark, anything to add to what Fantino said?
Well.. the cable removal and stud installation was done not by me but by an artisan..
I had many troubles to build the cable because no one is anymore building tailored cables.
There is to find a good quality 16 mm2 flexible black cable for batteries... (you can find in boat shops or car electrian workshops or online under "16mm2 battery cable"),  then there are two choices for the type of terminals : terminal lugs or open barrel terminals (this last type is like the old one).
I wasn't able to find if open barrel terminals still exists for 16mm2 cable and D6 hole.
I opted for terminal lugs .
It is important to find the correct lug M6/16mm2 and use the correct tool to crimp to wire, otherwise larger lugs or improperly squeezed lugs will bring troubles because the space to pass the cable is narrow.
to cover the terminal I used an additional 32411-230-000 honda gum cover that is already used on the breaker side of the cable.
The lug on the motor must be bent a little (30° circa). Lenght of the cable is around 650 mm.
It is also possible to buy such cable in yamiya shop:
https://www.yamiya750.com/index.php?main_page=product_info&cPath=246_21_250_59&products_id=3666

but I didn't because I'm in Europe and there is a lot to pay for custom, delivery and a lot to wait.


« Last Edit: June 23, 2021, 08:28:30 AM by _mark »

Offline grcamna2

  • Not a
  • Really Old Timer ...
  • *******
  • Posts: 15,181
  • I love to restore & travel. Keep'em Going Strong !
Re: starter motor reconditioning
« Reply #10 on: June 23, 2021, 11:40:26 AM »
_mark,do you have enough clearance between the threaded stud which comes out of the starter/cable and your engine cases ?
75' CB400F/'bunch o' parts' & 81' CB125S modded to a 'CB200S'
  I love the small ones too !
Do your BEST...nobody can take that away from you.

Offline PeWe

  • Really Old Timer ...
  • *******
  • Posts: 15,595
  • Bike almost back to the 70's 2015
Re: starter motor reconditioning
« Reply #11 on: June 23, 2021, 12:25:31 PM »
I think the stud will aim to the rectangular opening for wires, starter 12V and oil pressure sensor.

My CB750 K6 has a CB900 -81 starter with stud connection in same direction as CB750 stock.

I was lucky to find a 16mm2 battery ground wire 600mm long with crimped ears that I could just bolt on, exact lenght.
 I verified that stud and ear to motor did not get in contact with case.
Stock CB750 on top

CB900 with stud.

« Last Edit: June 23, 2021, 12:43:44 PM by PeWe »
CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline _mark

  • Enthusiast
  • **
  • Posts: 183
Re: starter motor reconditioning
« Reply #12 on: June 23, 2021, 01:03:54 PM »
_mark,do you have enough clearance between the threaded stud which comes out of the starter/cable and your engine cases ?
yes, there is a rectangular opening for the wires as you can see in the picture. So no any risk for clashing in the case.

Offline Maltboy

  • Pitter-patter, let's git at 'er!
  • Hot Shot
  • ***
  • Posts: 270
  • Making stupid mistakes since 1959
Re: starter motor reconditioning
« Reply #13 on: June 23, 2021, 03:33:45 PM »
What was the reason for bending the stud?  Just curious.

Offline _mark

  • Enthusiast
  • **
  • Posts: 183
Re: starter motor reconditioning
« Reply #14 on: June 23, 2021, 05:41:06 PM »
What was the reason for bending the stud?  Just curious.
I didn t bent any stud. I bent a little the tail of the lug because of the position of the cavity and because the cable must do a U turn .