Author Topic: Is this an exhaust from a cb750 F on my K8?  (Read 1141 times)

0 Members and 1 Guest are viewing this topic.

Offline 78whiteorbs

  • Expert
  • ****
  • Posts: 1,418
Is this an exhaust from a cb750 F on my K8?
« on: June 14, 2013, 01:45:13 PM »
started out with a brake problem then noticed something very obvious ( can you see it?lol)
well I am wondering why this was done ... I looked from the top and it looks like it may have been done to clear the exhaust. Why I haven't a clue unless it was a different muffler mated to a cb750 F 4-1 header slapped on my K8. Any how I am trying to rectify this situation and any help is greatly appreciated.







« Last Edit: June 14, 2013, 01:47:21 PM by 78whiteorbs »

Offline LesterPiglet

  • Old Timer
  • ******
  • Posts: 4,046
  • 1977 CB550F2
Re: Is this an exhaust from a cb750 F on my K8?
« Reply #1 on: June 14, 2013, 01:52:22 PM »
It's certainly not an F silencer.
Maybe an F brake pedal will sort it.
'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. Draw and drawer. Could care less/couldn't care less. Bought/brought FFS.


Les Ross.            Certified by a Professional

Offline flybox1

  • My wife thinks I'm a
  • Really Old Timer ...
  • *******
  • Posts: 14,301
Re: Is this an exhaust from a cb750 F on my K8?
« Reply #2 on: June 14, 2013, 01:55:50 PM »
should be no need for that mod.  the proper lever should angle out on its own to be in front of the foot peg.
and it wont interfere with the exhaust.

'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mineā€¦"

Offline Bankerdanny

  • Eventually I will be old enough in reality to be
  • Really Old Timer ...
  • *******
  • Posts: 7,625
  • Endeavor to persevere
Re: Is this an exhaust from a cb750 F on my K8?
« Reply #3 on: June 14, 2013, 03:31:31 PM »
I don't think the factory exhaust on any of the F bikes requires removal to get at the oil filter. I know the 400 and 550F's don't.

A quick search reveals that the 750F pipes do block the filter housing, so yes, that appears to be a factory 750F header, but an aftermarket muffler.
« Last Edit: June 14, 2013, 03:34:09 PM by Bankerdanny »
"The problem with quotes on the Internet is that you never know if they're true" - Abraham Lincoln

Current: '76 CB750F. Previous:  '75 CB550F, 2007 Yamaha Vino 125 Scooter, '75 Harley FXE Superglide, '77 GL1000, '77 CB550k, '68 Suzuki K10 80, '68 Yamaha YR2, '69 BMW R69S, '71 Honda SL175, '02 Royal Enfield Bullet 500, '89 Yamaha FJ1200

bollingball

  • Guest
Re: Is this an exhaust from a cb750 F on my K8?
« Reply #4 on: June 14, 2013, 04:51:17 PM »
First off you will need a K brake pedal. Then when you go to slide it on you should see why the hack job was done. Probably a clearance issue with that fat muffler. Notice the arm does not line up with the missing adjustment bolt. You either need the oem 4 into 4 $$$$ or a 4 into 2 that is what I have on mine. Made for the 77-78K. The price is so high for the oem it makes the 4 into 2 look like a good option and they sound pretty damn good mine has a good deep mellow sound to it. I have never been a fan of the 4 into 1 system on any bike. Also if you keep that air box the carbs if stock will be fine.

Ken

Offline lucky

  • Really Old Timer ...
  • *******
  • Posts: 6,717
Re: Is this an exhaust from a cb750 F on my K8?
« Reply #5 on: June 14, 2013, 06:01:39 PM »
started out with a brake problem then noticed something very obvious ( can you see it?lol)
well I am wondering why this was done ... I looked from the top and it looks like it may have been done to clear the exhaust. Why I haven't a clue unless it was a different muffler mated to a cb750 F 4-1 header slapped on my K8. Any how I am trying to rectify this situation and any help is greatly appreciated.
Photos omitted for space reasons.



No that is not from a Honda F model.

Offline BeSeeingYou

  • Old Timer
  • ******
  • Posts: 3,913
Re: Is this an exhaust from a cb750 F on my K8?
« Reply #6 on: June 14, 2013, 09:12:19 PM »
The header is from an F but the muffler is not.  It looks like you can't get the filter off without removing the header but you can.  The brake pedal pivot is positioned differently between the K and F bikes and the K bike pedal will not work without some type of modification or possibly hanging the exhaust a bit lower.  Could also try an F pedal.  It has been done so maybe someone with first hand info can chime in.  On the middle pic the stock F muffler is hanging lower than it would on an F bike to give room to clear the passenger footpeg and give the pedal some clearance.  If you are keeping the F header I think the existing solution is not that bad, just needs to be cleaned up a bit/paint, PC, or chromed.  You can see how high the pedal is positioned on the K bike.

76F header
K bike with F exhaust
76F brake pedal
« Last Edit: June 14, 2013, 09:26:37 PM by srust58 »

Offline bytio

  • Enthusiast
  • **
  • Posts: 145
Re: Is this an exhaust from a cb750 F on my K8?
« Reply #7 on: June 15, 2013, 01:59:24 PM »
The down pipes are from the CB750 F1

Offline bytio

  • Enthusiast
  • **
  • Posts: 145
Re: Is this an exhaust from a cb750 F on my K8?
« Reply #8 on: June 15, 2013, 01:59:58 PM »
The down pipes are from the CB750 F1

bollingball

  • Guest
Re: Is this an exhaust from a cb750 F on my K8?
« Reply #9 on: June 15, 2013, 02:09:53 PM »
Do you have two post going on about the same thing or close to it??
Ken

Offline 78whiteorbs

  • Expert
  • ****
  • Posts: 1,418
Re: Is this an exhaust from a cb750 F on my K8?
« Reply #10 on: June 15, 2013, 03:45:37 PM »
This was in regards to the exhaust and the other was inregards to the brakes. But yes they are related I just thought it would be sensible to keep the topics seperate rather than one run on post covering multiple subjects