« previous next »
Pages: [1]   Go Down

Author Topic: Early 750 cylinder??  (Read 842 times)

0 Members and 1 Guest are viewing this topic.

Offline cbr954

  • Hot Shot
  • ***
  • Posts: 402
Early 750 cylinder??
« on: November 02, 2014, 12:54:16 pm »
This cylinder block is sleeved and bore for 1000cc.  What I am curious about is the shape of the holes next to the timing chain tunnel, all of my other cylinders have rounder holes where these are a straight rectangular shape.  The casting is also very rough compared to any of my other cylinders.  I also have a RC engineering cylinder head which is very rough and has the non removable oil restrictors.  I am just curious as to how early this cylinder is.
Logged
03 CBR954RR, 72 750 chopper(970cc
F2 head), 2017 CRF450R, 2001 CR250R, 72 CB500, 79 XR250, 04 CRF50,70's soon to be rebuilt cb750 drag bike.

Offline Old Scrambler

  • My CB750K3 has been in 39 States & 5 Provinces
  • Old Timer
  • ******
  • Posts: 3,802
Re: Early 750 cylinder??
« Reply #1 on: November 02, 2014, 01:01:57 pm »
Looks like old-factory versus the new factory in mid-'70. Wide cam-chain tower and no threaded bolt-hole between the 2-3 exhaust ports.
Logged
Dennis in Wisconsin
'64 Triumph Cub & '74 Honda CB750 Bonneville Salt Flats AMA Record Holder (6)
CB750 Classic Bonneville Racer thread - http://forums.sohc4.net/index.php/topic,135473.0.html
'63 CL72 Project(s)
'66 CL77 Red
'67 Triumph T100C
'73 750K3 Owned since New
'77 750F2 Cafe Project
2020 ROYAL ENFIELD Himalayan

Offline 754

  • Really Old Timer ...
  • *******
  • Posts: 29,058
Re: Early 750 cylinder??
« Reply #2 on: November 02, 2014, 01:05:01 pm »
Early, not sure how long they used them but check for the thread up top.
Logged
Maker of the WELDLESS 750 Frame Kit
dodogas99@gmail.com
Kelowna B.C.       Canada

My next bike will be a ..ANFOB.....

It's All part of the ADVENTURE...

73 836cc.. Green, had it for 3 decades!!
Lost quite a few CB 750's along the way

Offline Big Jay

  • Expert
  • ****
  • Posts: 1,252
    • CBRzone
Re: Early 750 cylinder??
« Reply #3 on: November 05, 2014, 11:52:12 pm »
If the sleeved protrude into those two places, you should seal them up from the bottom.
Logged
Pages: [1]   Go Up
« previous next »