Author Topic: Delkevic Exhaust Question  (Read 1053 times)

0 Members and 2 Guests are viewing this topic.

Offline zekd

  • Full Member
  • *
  • Posts: 69
  • the "b" team
Delkevic Exhaust Question
« on: December 17, 2019, 10:44:24 PM »
Looking to grab a new stainless steel exhaust system.  I have a 1972 CB750 but really like the look of their model that is designed for a 78-80 CB750.  Do you think that one will fit my 1972?  I feel like the headers are all the same.  Thx!

Offline PeWe

  • Really Old Timer ...
  • *******
  • Posts: 15,571
  • Bike almost back to the 70's 2015
Re: Delkevic Exhaust Question
« Reply #1 on: December 18, 2019, 03:02:19 AM »
78-80 CB750 is the twin cam right?

I used a Russ Collins 4-1 made for K7 many years ago. Had to fabricate brackets for rear mount and pegs. see photo

I think this bike on the video use a later system for twin cam CB750. Vance&Hines SS2R Carbon.
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 kerryb

  • Not a very
  • Expert
  • ****
  • Posts: 1,150
  • 78 750k 74 cb550k, '83GL1100 FXSTC, 1979 Wilmac
Re: Delkevic Exhaust Question
« Reply #2 on: December 18, 2019, 06:51:39 AM »
The last year of the sohc750 was 1978. 
If someone made an exhaust that fits the dohc motors as well as the sohc motors, that means the spacing of the exhaust ports on the heads didn't change...

do 69-76 exhausts also fit 77-78 heads? (If you also change the spigots)

learn something new every day!
intrigued by the wail...seduced by the scream.

Offline Don R

  • My Sandcast is a
  • Really Old Timer ...
  • *******
  • Posts: 19,911
  • Saver of unloved motorcycles.
Re: Delkevic Exhaust Question
« Reply #3 on: December 18, 2019, 09:31:58 AM »
 Drag racers are using the V/H cb750/cb1100 twin cam headers. They require a little tweaking at the rear mount but I have one on a K2 bike. 
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: 15,571
  • Bike almost back to the 70's 2015
Re: Delkevic Exhaust Question
« Reply #4 on: December 18, 2019, 10:17:19 AM »
The bike on Dyno is a racer bike. Classic racing.
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: 14,912
  • Bought her new 4/75
Re: Delkevic Exhaust Question
« Reply #5 on: December 18, 2019, 11:41:40 AM »
Looking to grab a new stainless steel exhaust system.  I have a 1972 CB750 but really like the look of their model that is designed for a 78-80 CB750.  Do you think that one will fit my 1972?  I feel like the headers are all the same.  Thx!

Surely they have one listed for a 72?? and could it be that much different than the SOHC? AFAIK??? the headers are the same for the SOHC and there are 2 diffent mufflers which may have different mounts for different 750 models (excluding the DOHC). Not so sure about the collector being a single model? 
As of today 3/13/2012 my original owner 75 CB750F has made it through 3 wives, er EX-wives. Free at last.  ;-)