« previous next »
Pages: [1]   Go Down

Author Topic: type of fork oil, and how much do i use?  (Read 1245 times)

0 Members and 1 Guest are viewing this topic.

Offline 75 super sport

  • Hot Shot
  • ***
  • Posts: 263
type of fork oil, and how much do i use?
« on: May 08, 2015, 12:34:38 PM »
I have a 1975 cb750f. Looking to replace the existing fork oil. Just wondering what types of fluids can be used, and how much do I put in? Is there a way to measure how much Ok I currently have in there? Thanks guys!
Logged
"Smoke em if ya got em"

Offline greenjeans

  • Industrial strengthed dreamer.
  • Old Timer
  • ******
  • Posts: 2,962
  • 1972 CB750K2
Re: type of fork oil, and how much do i use?
« Reply #1 on: May 08, 2015, 03:34:45 PM »
You can use ATF (automatic transmission fluid)  I believe 5-6 oz.   I have old measuring cups that I measure it into and a small funnel.  The small nut at the bottom of the fork can be used to drain.  Take the top nut off to fill. 
Logged
Yep, I'm the kid that figured out how to put things back together...eventually.

Offline Stev-o

  • Ain't no
  • Really Old Timer ...
  • *******
  • Posts: 34,355
  • Central Texas
Re: type of fork oil, and how much do i use?
« Reply #2 on: May 08, 2015, 04:03:16 PM »
+1 ATF.  Or go buy expensive Fork oil at the bike shop.
Logged
'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline 75 super sport

  • Hot Shot
  • ***
  • Posts: 263
Re: type of fork oil, and how much do i use?
« Reply #3 on: May 08, 2015, 04:44:08 PM »
What about rotella 15w?
Logged
"Smoke em if ya got em"

Offline edwardmorris

  • Youngish
  • Old Timer
  • ******
  • Posts: 3,142
  • Do not cause harm, nor respond to harm with harm.
Re: type of fork oil, and how much do i use?
« Reply #4 on: May 08, 2015, 06:03:45 PM »
I'm told ATF has a lot of detergent, a diesel based 10w30 is better. I went with Rotella, but they don't sell it in 1Qts  >:( had to buy a gallon. How much to use depends on the springs, need to go by manufacturer.
Logged

Offline ofreen

  • Old Timer
  • ******
  • Posts: 4,029
Re: type of fork oil, and how much do i use?
« Reply #5 on: May 08, 2015, 07:22:15 PM »
1 bottle of fork oil will do both forks.  6 - 6 1/2 oz, depending on your preference for how it feels.  I use PJ1 7 1/2 wgt in my '75 750F.  I used ATF years ago, but found the fork had noticeably less stiction with the PJ fork oil.  These primitive forks need all the help they can get.  I tried 10 wgt once but found the action to be harsh.  7 1/2 is a close approximation to ATF viscosity.
Logged
Greg
'75 CB750F

"I would rather have questions I cannot answer than answers I cannot question." - Dr. Wei-Hock Soon

Offline CycleRanger

  • No comment about being an
  • Really Old Timer ...
  • *******
  • Posts: 5,442
  • Central Texas Shop Manual Advocate
Re: type of fork oil, and how much do i use?
« Reply #6 on: May 08, 2015, 09:27:34 PM »
Logged
Do you have a copy of the Honda Shop Manual or Parts List for your bike? Get one here:
https://www.honda4fun.com/materiale/documentazione-tecnica
CB750K5        '79 XL250s     CL350K3
CB750K3        '76 XS650      '76 CJ360T

Offline 70CB750

  • Labor omnia vincit improbus.
  • Really Old Timer ...
  • *******
  • Posts: 14,805
  • Northern Virginia
Re: type of fork oil, and how much do i use?
« Reply #7 on: May 09, 2015, 12:26:07 AM »
I used ATF first than with short forks 15W40 and nowI run 7W Bel Ray
Logged
Prokop
_______________
Pure Gas - find ethanol free gas station near you

I love it when parts come together.

Dorothy - my CB750
CB750K3F - The Red
Sidecar


CB900C

2006 KLR650

Offline ekpent

  • Really Old Timer ...
  • *******
  • Posts: 13,512
  • To many bikes-but lookin' for more
Re: type of fork oil, and how much do i use?
« Reply #8 on: May 09, 2015, 05:39:10 AM »
Be sure to do that on the center stand. If you remove both of the top caps of the forks on the side stand your in for a big surprise like a collapsing front end  ;)
Logged

Offline jacobsd8195

  • Full Member
  • *
  • Posts: 15
Re: type of fork oil, and how much do i use?
« Reply #9 on: May 09, 2015, 01:27:14 PM »
Quote from: ekpent on May 09, 2015, 05:39:10 AM
Be sure to do that on the center stand. If you remove both of the top caps of the forks on the side stand your in for a big surprise like a collapsing front end  ;)

Yep, I found out this the hard way... I also have a nice pattern on the garage wall from the fork oil spraying out during the collapse. A memorable learning experience!
Logged
Pages: [1]   Go Up
« previous next »