Honda CB750 Sandcast

Bringing 1983 / 2005 back to live

Sgt.Pinback · 353 · 103218

Sgt.Pinback

  • Hero Member
  • *****
    • Posts: 695
    • View Profile
As said above I have no use for the "HM300".

I bought them a few years ago for my diecast but then realized she will need "HMCB750" pipes as being a German spec. bike.
Found those in the meantime.

Cheers, Uli (Leonberg, Germany)


Sgt.Pinback

  • Hero Member
  • *****
    • Posts: 695
    • View Profile
Took out the wire harness. Its the old -0400 type

Bevore going to the bigger tasks......will try to rescue this one and clean it first.

How may I restore those black (platic?) sheaths?

« Last Edit: August 10, 2017, 01:40:45 am by Sgt.Pinback »
Cheers, Uli (Leonberg, Germany)


Steve Swan

  • Hero Member
  • *****
    • Posts: 2705
    • View Profile
    • cb750sandcastonly.com
if i did not say it already, the fit of Yamiya "no.no" exhaust leaves as much or even more to be desired as oem HM300's.    i just fitted a set of Yamiya "no.no" to a K1, the connecting pipes at rear of exhaust do not align well at all.  oem or repro, "alignment" varies from set to set.  this last set of Yamiya's, the connecting pipes were off by half the diameter of the connecting pipe.  "no.no's a really wrong part for the K1 application, but considering what prices are being demanded for oem HM's v.s. repro "no.no's," my going with "no.no's" is a no brainer for me.

as for getting the best possible alignment of these pipes, i have found leaving the exhaust loose at the spigots, tightening  the passenger pillion bolts first, then the spigot bolts helps somewhat.


Steve Swan

  • Hero Member
  • *****
    • Posts: 2705
    • View Profile
    • cb750sandcastonly.com
Didn't Ash or Mark find the black wrapping to recover the harness ?

and, after you have harness apart, run the wires through an ultrasonic bath.  you'll be pleasantly surprised how clear and more supple the terminal overs become !


Sgt.Pinback

  • Hero Member
  • *****
    • Posts: 695
    • View Profile
Thatīs what I did, Steve.

Here is the result:

« Last Edit: August 10, 2017, 01:41:59 am by Sgt.Pinback »
Cheers, Uli (Leonberg, Germany)


Sgt.Pinback

  • Hero Member
  • *****
    • Posts: 695
    • View Profile
I think I will go for this one, 20mm diameter.
Thats slightly more but would give me a little more space to fiddle the cables.

http://www.ebay.de/itm/METERWARE-PVC-Isolierschlauch-Bougierrohr-fur-Kabelbaum-ca-20mm-/121992398202?hash=item1c6750457a:g:4PsAAOxy7nNTVjLF

Cheers, Uli (Leonberg, Germany)


Sgt.Pinback

  • Hero Member
  • *****
    • Posts: 695
    • View Profile
Roughly cleaned front brake.

Good news: correct Tokico 1 caliper with "8" between front fins and the extra fin on the back, short neck brake hoses.

Bad news: brake hoses are porose and the bleeder as well as the brake line are stuck in the caliper. No wonder after sitting that long.

Bought myself a 10/12 brake-line wrench, sprayed WD40.... maybe have to fix them on the fork again to get them out.

+ heat?


« Last Edit: August 10, 2017, 01:43:39 am by Sgt.Pinback »
Cheers, Uli (Leonberg, Germany)


Steve Swan

  • Hero Member
  • *****
    • Posts: 2705
    • View Profile
    • cb750sandcastonly.com

kp

  • Administrator
  • Hero Member
  • *****
    • Posts: 1806
    • View Profile
Heat the fitting area and get it HOT using LPG. The fitting will then be easily removed Try not to undo the fitting cold as this will damage the alloy
And yes, I have these hoses and are an EXACT match Email me if you want them KP
Yabba Dabba KP


Sgt.Pinback

  • Hero Member
  • *****
    • Posts: 695
    • View Profile
Heat the fitting area and get it HOT using LPG. The fitting will then be easily removed Try not to undo the fitting cold as this will damage the alloy
And yes, I have these hoses and are an EXACT match Email me if you want them KP

Thank you for the info.

Email to you sent.

LPG = ? Will a heating gun give sufficient heat?
Cheers, Uli (Leonberg, Germany)


kp

  • Administrator
  • Hero Member
  • *****
    • Posts: 1806
    • View Profile
Liquid Petroleum Gas
Butane/propane is another name  commonly used although they are slightly different You can use a gas stove burner This will work
The aluminium and steel expand at different rates so the tight bond should be broken with heat
Yabba Dabba KP


Sgt.Pinback

  • Hero Member
  • *****
    • Posts: 695
    • View Profile
Thanks for info.

Got parcel today and managed to fiddle the cables through the sheath.
« Last Edit: August 10, 2017, 01:49:15 am by Sgt.Pinback »
Cheers, Uli (Leonberg, Germany)


Sgt.Pinback

  • Hero Member
  • *****
    • Posts: 695
    • View Profile
Finished cleaning the carbs. I love the Xmas present of my wife, a nice little ultrasonic cleaner.
Didn't want to make them too shine and tried to keep the original finish.

Good news, I found nice replica 5mm cables. Bad news, the upper connection to grip is bigger than genuine throttle cable. Single cable is longer, the 4 cables are shorter. No idea it this can work, I assume the 4 cables are too short to fix properly.

What would you do, regarding the upper connection?

« Last Edit: August 10, 2017, 01:51:32 am by Sgt.Pinback »
Cheers, Uli (Leonberg, Germany)


Sgt.Pinback

  • Hero Member
  • *****
    • Posts: 695
    • View Profile
Here (the one the left) is the ignition switch the bike came with.

Obviously not a recessed one, but different to the other switches I have. "OFF" is upside down, the thread is longer, the ring is different.
The one on the right say "ignition", I guess this is a later one (K2 ?)

Is this a KO switch and if so, had all SC the recessed one, when did they change ?

« Last Edit: August 10, 2017, 01:53:20 am by Sgt.Pinback »
Cheers, Uli (Leonberg, Germany)


Steve Swan

  • Hero Member
  • *****
    • Posts: 2705
    • View Profile
    • cb750sandcastonly.com
"What would you do, regarding the upper connection?"

find the correct throttle tube.  or modify the throttle tube you have.  the throttle tube is made of white plastic.