Author Topic: CB750F1 Project  (Read 20422 times)

Offline mick

  • SOHC Master
  • Posts: 1474
    • View Profile
Re: CB750F1 Project
« Reply #15 on: November 14, 2014, 09:31:36 PM »
it looks like grease out of a grease gun , think the engines fit for a boat anchor  ;) cheers mick.

Offline LesterPiglet

  • SOHC Pro
  • Posts: 986
  • 1977 CB550F2
    • View Profile
Re: CB750F1 Project
« Reply #16 on: November 14, 2014, 09:41:20 PM »
That head damage wasn't caused by rings as it extends beyond the bore. My guess is it was caused by a twat.
'Then' and 'than' are completely different words and have completely different meanings. Same with 'of' and 'have'. Set and sit. There, their and they're. Set/sit. Bought/brought FFS. Bloody Americans.


Les Ross. Certified by a Professional

Offline martin_uk

  • SOHC Expert
  • Posts: 435
    • View Profile
Re: CB750F1 Project
« Reply #17 on: November 14, 2014, 11:06:43 PM »
That head damage wasn't caused by rings as it extends beyond the bore. My guess is it was caused by a twat.

Just the effect of water in combustion chamber over an extended period of time.
1977 CB750F1
1977 CB750f1 836
1978 CB750F1
1975 CB500K1

Triumph Street Triple 675R
Ducati 800 Icon Scrambler
Triumph 3TA
AJS 350 mod16
BSA BantamD1
Honda C90zz
Honda CB500X
BSA WD B40 350

Offline martin_uk

  • SOHC Expert
  • Posts: 435
    • View Profile
Re: CB750F1 Project
« Reply #18 on: November 14, 2014, 11:08:08 PM »

2014_0425cb750B40025 by nitram2010, on Flickr

What in the hell is that thing?  Is that a worm?  You must have very different worms on your side of the pond.
I think that someone thought that squirting grease in there would help to un seize ::)
1977 CB750F1
1977 CB750f1 836
1978 CB750F1
1975 CB500K1

Triumph Street Triple 675R
Ducati 800 Icon Scrambler
Triumph 3TA
AJS 350 mod16
BSA BantamD1
Honda C90zz
Honda CB500X
BSA WD B40 350

Offline matthewmosse

  • SOHC Master
  • Posts: 2161
    • View Profile
Re: CB750F1 Project
« Reply #19 on: November 15, 2014, 07:59:48 AM »
That head damage wasn't caused by rings as it extends beyond the bore. My guess is it was caused by a twat.
on mine, the rings had smashed their way out of the top of the piston somehow and gotten trapped between the piston and head causing similar dammage, then someone had poped the head off, removed the debris. I went one further and replaced the pisteons but ran a head with very similar dammage. Water doesn't do that to a head, I had an engine where all the cultch casing had literally corroded away, gearbox totally shot, somehow the head was immaculate once a few kilos of thick clay mud were removed from inside the rocker cover. I still think it sensible to source a replacement engine though I have thashed a few years commuting out of 550s with parts that rough.
Got a 500/4 with rust and a sidecar and loadsa bits. nice and original and been round the clock

Offline UK Pete

  • SOHC Jedi
  • Posts: 2696
    • View Profile
Re: CB750F1 Project
« Reply #20 on: November 15, 2014, 12:49:36 PM »
Ok martin here are the pictures as promised , the engine seems to be complete, but is totally stripped, this is how i bought it, it was stripped as it needs reconditioning, probably rebore and the usual things like cam chain and tensioners etc
Some of the outer covers are no good , the altenator cover has damage, and the sump plug hole has been welded up

The F1 exhaust is about as good as you will find for a second hand one, very solid , the side that you see is still quite bright but far from perfect, the rear where it does not get cleaned has fine surface corrosion but solid no holes , tiny crack where it clamps up, but very usable

Here is the link to the pictures the price is £300 for the lot 
http://s924.photobucket.com/user/UK-Pete/library/392%20engine%20and%20%20F1%20exhaust

Offline martin_uk

  • SOHC Expert
  • Posts: 435
    • View Profile
Re: CB750F1 Project
« Reply #21 on: November 15, 2014, 02:42:35 PM »
Ok martin here are the pictures as promised , the engine seems to be complete, but is totally stripped, this is how i bought it, it was stripped as it needs reconditioning, probably rebore and the usual things like cam chain and tensioners etc
Some of the outer covers are no good , the altenator cover has damage, and the sump plug hole has been welded up

The F1 exhaust is about as good as you will find for a second hand one, very solid , the side that you see is still quite bright but far from perfect, the rear where it does not get cleaned has fine surface corrosion but solid no holes , tiny crack where it clamps up, but very usable

Here is the link to the pictures the price is £300 for the lot 
http://s924.photobucket.com/user/UK-Pete/library/392%20engine%20and%20%20F1%20exhaust

Thanks Pete, really appreciate your help.

I can collect today if you are available, will call to arrange.

Can I make a final decision on silencer when I see.

Thanks again.
1977 CB750F1
1977 CB750f1 836
1978 CB750F1
1975 CB500K1

Triumph Street Triple 675R
Ducati 800 Icon Scrambler
Triumph 3TA
AJS 350 mod16
BSA BantamD1
Honda C90zz
Honda CB500X
BSA WD B40 350

Offline martin_uk

  • SOHC Expert
  • Posts: 435
    • View Profile
Re: CB750F1 Project
« Reply #22 on: November 16, 2014, 04:42:59 PM »
Thanks to Pete, now have another engine to play with :D
1977 CB750F1
1977 CB750f1 836
1978 CB750F1
1975 CB500K1

Triumph Street Triple 675R
Ducati 800 Icon Scrambler
Triumph 3TA
AJS 350 mod16
BSA BantamD1
Honda C90zz
Honda CB500X
BSA WD B40 350

Offline martin_uk

  • SOHC Expert
  • Posts: 435
    • View Profile
Re: CB750F1 Project
« Reply #23 on: November 16, 2014, 04:47:32 PM »
Here is the bike as I received it.

2014_0418cb750B40003 by nitram2010, on Flickr

Doesnt look too bad, but I wanted to get rid of all the rust, so completely stripped
1977 CB750F1
1977 CB750f1 836
1978 CB750F1
1975 CB500K1

Triumph Street Triple 675R
Ducati 800 Icon Scrambler
Triumph 3TA
AJS 350 mod16
BSA BantamD1
Honda C90zz
Honda CB500X
BSA WD B40 350

Offline martin_uk

  • SOHC Expert
  • Posts: 435
    • View Profile
Re: CB750F1 Project
« Reply #24 on: November 16, 2014, 04:50:08 PM »
Carbs are pretty grungy

2014_0420cb750B40005 by nitram2010, on Flickr

2014_0420cb750B40001 by nitram2010, on Flickr

1977 CB750F1
1977 CB750f1 836
1978 CB750F1
1975 CB500K1

Triumph Street Triple 675R
Ducati 800 Icon Scrambler
Triumph 3TA
AJS 350 mod16
BSA BantamD1
Honda C90zz
Honda CB500X
BSA WD B40 350

Offline martin_uk

  • SOHC Expert
  • Posts: 435
    • View Profile
Re: CB750F1 Project
« Reply #25 on: November 16, 2014, 04:55:50 PM »
I wont have to use this engine after all :o

2014_0404BM0012 by nitram2010, on Flickr
1977 CB750F1
1977 CB750f1 836
1978 CB750F1
1975 CB500K1

Triumph Street Triple 675R
Ducati 800 Icon Scrambler
Triumph 3TA
AJS 350 mod16
BSA BantamD1
Honda C90zz
Honda CB500X
BSA WD B40 350

Offline Trigger

  • Grogu
  • *
  • Posts: 8434
  • Engines built on reputation, not advertising.
    • View Profile
Re: CB750F1 Project
« Reply #26 on: November 16, 2014, 04:59:53 PM »
Not a bad looking bike. Those carbs will clean up.
Have a rear brake peddle for one of those on fleabay.
« Last Edit: November 16, 2014, 05:02:52 PM by Trigger »

Offline SteveD CB500K0

  • Administrator
  • SOHC Jedi
  • Posts: 4442
  • Ride on the Steel Breeze...
    • View Profile
    • Steve's Blog
Re: CB750F1 Project
« Reply #27 on: November 16, 2014, 05:51:28 PM »
Keep it yellow. I do like that colour on the F1.
2022 Tiger Sport 660
1971 CB500K0

Offline Trigger

  • Grogu
  • *
  • Posts: 8434
  • Engines built on reputation, not advertising.
    • View Profile
Re: CB750F1 Project
« Reply #28 on: November 16, 2014, 06:37:26 PM »
I am with you on this one Steve. Yellow is the best colour on the F1.

Offline UK Pete

  • SOHC Jedi
  • Posts: 2696
    • View Profile
Re: CB750F1 Project
« Reply #29 on: November 16, 2014, 06:44:27 PM »
Great to meet you martin , hope the bits are useful , btw looks like trigger also has the rear master cylinder your after on ebay
Oh yes yellow is really nice on the f1, does anyone know if the f1 is Sulpher Yellow, or parakeet yellow?
pete

 

SimplePortal 2.3.5 © 2008-2012, SimplePortal