« previous next »
Pages: [1]   Go Down

Author Topic: 392 Cylinder Head ID  (Read 1079 times)

0 Members and 1 Guest are viewing this topic.

Offline david 750f

  • Expert
  • ****
  • Posts: 827
  • 1976 CB750F
392 Cylinder Head ID
« on: February 08, 2018, 08:25:35 AM »
Anyone ever seen a 75/76 CB750F head that is marked X7?
I'm the second owner of the bike (over 20 years) and the original owner swears the head was never changed. Could he be mistaken?
Bike is a 76 CB750F, build date of Feb 76.

Logged
1976 CB 750F

Offline Don R

  • My Sandcast is a
  • Really Old Timer ...
  • *******
  • Posts: 20,258
  • Saver of unloved motorcycles.
Re: 392 Cylinder Head ID
« Reply #1 on: February 08, 2018, 09:24:28 AM »
 Are those Kibblewhite retainers?
Logged
No matter how many times you paint over a shadow, it's still there.
 CEO at the no kill motorcycle shop.
 You don't need a weatherman to know which way the wind blows.

Offline Jerry Rxman Griffin aka MuthaF'er

  • This MuthaF'er is getting to be a
  • Really Old Timer ...
  • *******
  • Posts: 14,938
  • Bought her new 4/75
Re: 392 Cylinder Head ID
« Reply #2 on: February 08, 2018, 01:14:08 PM »
Yes they are! And 5mm valve stems???

Flip it over and show us the chambers. THAT will be the difference regardless of the numbers. Most -392 heads have 392 near that 7 and I've seen them in 2 different fonts/styles.

Also what do the ports look like? Also measure the size of the intake heads.

The K7/K8 also used the same head.
Logged
As of today 3/13/2012 my original owner 75 CB750F has made it through 3 wives, er EX-wives. Free at last.  ;-)

Offline david 750f

  • Expert
  • ****
  • Posts: 827
  • 1976 CB750F
Re: 392 Cylinder Head ID
« Reply #3 on: February 09, 2018, 07:54:52 AM »
Don R,
Kibblewhite titanium retainers and springs. I had a leaky "puck" and its turned into a full performance engine re-build..

Jerry i know you like pictures so here they are.. No 5mm valves though.


Logged
1976 CB 750F

Offline Don R

  • My Sandcast is a
  • Really Old Timer ...
  • *******
  • Posts: 20,258
  • Saver of unloved motorcycles.
Re: 392 Cylinder Head ID
« Reply #4 on: February 09, 2018, 09:41:36 AM »
 Very nice. It's funny how those pucks lead to more rebuilding.
Logged
No matter how many times you paint over a shadow, it's still there.
 CEO at the no kill motorcycle shop.
 You don't need a weatherman to know which way the wind blows.

Offline PeWe

  • Really Old Timer ...
  • *******
  • Posts: 15,772
  • Bike almost back to the 70's 2015
Re: 392 Cylinder Head ID
« Reply #5 on: February 09, 2018, 10:08:24 AM »
A nice domino effect can start to occur! ;)
If giving the engine stronger rods, strong brain whispering will start to give those rods something to work with increasing the displacement to the other side of the 1000 :)
Logged
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 Jerry Rxman Griffin aka MuthaF'er

  • This MuthaF'er is getting to be a
  • Really Old Timer ...
  • *******
  • Posts: 14,938
  • Bought her new 4/75
Re: 392 Cylinder Head ID
« Reply #6 on: February 09, 2018, 01:43:16 PM »
Porting and -392 chambers. Nice head.

Now I want to know who did the head?
Logged
As of today 3/13/2012 my original owner 75 CB750F has made it through 3 wives, er EX-wives. Free at last.  ;-)

Offline sixthwisconsin

  • With an 1855 Springfield, I'm a
  • Hot Shot
  • ***
  • Posts: 553
Re: 392 Cylinder Head ID
« Reply #7 on: February 09, 2018, 06:26:15 PM »
Interesting...
Made me look back to how mine was marked.
While clearly 392, mine has 5X after that. Yours is X7 with no 392.
Not sure what it means.

Logged

Offline HondaMan

  • Someone took this pic of me before I became a
  • Really Old Timer ...
  • *******
  • Posts: 14,063
  • ...not my choice, I was nicknamed...
    • Getting 'em Back on the Road
Re: 392 Cylinder Head ID
« Reply #8 on: February 09, 2018, 09:20:22 PM »
I just sent one out with "X 7" on it, next to the "392". It was for another F0 bike.
Logged
See SOHC4shop@gmail.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 website: www.SOHC4shop.com

Offline scottly

  • Global Moderator
  • Really Old Timer ...
  • *****
  • Posts: 16,446
  • Humboldt, AZ
Re: 392 Cylinder Head ID
« Reply #9 on: February 09, 2018, 09:21:32 PM »
I have a K7 head with no 392 marking..
Logged
Don't fix it if it ain't broke!
Helmets save brains. Always wear one and ride like everyone is trying to kill you....
Pages: [1]   Go Up
« previous next »