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Author Topic: Fork oil mixture  (Read 2311 times)

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Offline Hush

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Fork oil mixture
« on: January 13, 2009, 03:28:15 AM »
Hey guys, gals'n geniuses.
I'm rebuilding a bike and the book reccomends using a 50/50 mixture of fork oil and 19w/40 engine oil?
This seems to me to be something akin to witchcraft!
Surely I would be better using just fork oil.....right?
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I think the thing I most like about motorcycling is the speed at which my brain must process information at to avoid the numb skulls who are eating pies, playing the ukulele, applying make-up etc in the comfort of their airconditioned armchairs as they make random attempts to kill me!!!!!!!

Offline SteveD CB500F

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Re: Fork oil mixture
« Reply #1 on: January 13, 2009, 04:57:34 AM »
Which book is that?

Fork oil for forks!
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Offline Soos

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Re: Fork oil mixture
« Reply #2 on: January 13, 2009, 05:12:23 AM »
Really?

My cb650 manual states ATF fluid may be substituted in place of fork oil.
(and thats what I use BTW)



l8r




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KingCustomCycles.com

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Re: Fork oil mixture
« Reply #3 on: January 13, 2009, 05:13:03 AM »
I use 10w30 with a dash of marvel mystery oil to reduce corrosion and thin viscosity.  I have also used ATF with good results.  I could just go to my local Honda dealer and pony up the cash for "approved" slick stuff and rest better at night.  Most of my bikes arrived at my door with a combination of metal wear particles and dirt, held in a suspension of water and sludge for the last 25 years.  What do I know though..... ;)
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Offline HondaMan

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Re: Fork oil mixture
« Reply #4 on: January 13, 2009, 05:13:47 AM »
That 19w/40 oil must be worth a fortune!  ;D
Maybe that's what the old fish oil used to be....

My favorite is the teflon-laced oils. Moly would also be good, but holds water more. 10w oil is sufficient, unless the load is over 200 lbs and the speeds are high, then a multi-weight is a little better. Don't use 10w40 unless you have strong forearms though: the shocks get mighty stiff in the mornings with the real wide-range oils.

Slick-ier is better, makes the forks respond over small bumps easier, once is spreads around inside the seals and parts. ATF is the right viscosity, but kinda 'sticky' in sliding parts (it's made for rotating parts, mostly).
« Last Edit: January 13, 2009, 05:19:16 AM by HondaMan »
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Offline SteveD CB500F

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Re: Fork oil mixture
« Reply #5 on: January 13, 2009, 05:17:29 AM »
Quote from: KingCustomCycles.com on January 13, 2009, 05:13:03 AM
I use 10w30 with a dash of marvel mystery oil to reduce corrosion and thin viscosity.

I know nothing...   which is why I moderate and don't make a fool of myself by trying to answer tech questions...

But. (you knew that was coming, right?)

Forks don't get hot so why use a multigrade?

If you want to thin viscosity, don't you use a thinner oil (like 15W for example?)

OMG!
I think I may have just started another "oil" thread...  ;D
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Offline HondaMan

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Re: Fork oil mixture
« Reply #6 on: January 13, 2009, 05:20:17 AM »
Quote from: SteveD CB500F on January 13, 2009, 05:17:29 AM
Quote from: KingCustomCycles.com on January 13, 2009, 05:13:03 AM
I use 10w30 with a dash of marvel mystery oil to reduce corrosion and thin viscosity.

I know nothing...   which is why I moderate and don't make a fool of myself by trying to answer tech questions...

But. (you knew that was coming, right?)

Forks don't get hot so why use a multigrade?

If you want to thin viscosity, don't you use a thinner oil (like 15W for example?)

OMG!
I think I may have just started another "oil" thread...  ;D

Oh, no! Someone pull out that fuse! Quick!  :o
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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 Jonesy

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Re: Fork oil mixture
« Reply #7 on: January 13, 2009, 05:20:28 AM »
According to the Haynes CB750 Repair manual, The earlier-style forks on the CB750 (with the replaceable bushings) use 10W-40, whereas the later design specified ATF per the owner's manual.

I have a K1 owners manual... I might look up what it recommends for "early" forks...
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KingCustomCycles.com

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Re: Fork oil mixture
« Reply #8 on: January 13, 2009, 05:21:28 AM »
Quote from: SteveD CB500F on January 13, 2009, 05:17:29 AM
Quote from: KingCustomCycles.com on January 13, 2009, 05:13:03 AM
I use 10w30 with a dash of marvel mystery oil to reduce corrosion and thin viscosity.

I know nothing...   which is why I moderate and don't make a fool of myself by trying to answer tech questions...

But. (you knew that was coming, right?)

Forks don't get hot so why use a multigrade?

If you want to thin viscosity, don't you use a thinner oil (like 15W for example?)

OMG!
I think I may have just started another "oil" thread...  ;D

Cause 10w30 is what my Tercel uses and I have a case on hand. I am a fool daily, I finally got used to it.  Not bad for an aeronautical professor huh?   ;D
« Last Edit: January 13, 2009, 05:23:12 AM by KingCustomCycles.com »
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bikerdave47

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Re: Fork oil mixture
« Reply #9 on: January 13, 2009, 06:49:30 AM »
As original purchaser of a K2, manual calls for 7 oz. of 10w30 per fork...
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Offline hcritz

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Re: Fork oil mixture
« Reply #10 on: January 13, 2009, 07:20:27 AM »
Another Oil Thread...Ewwwwwww!
I've done the same as some of you...a witche's brew of ATF and Marvels with a splash of PFTE (slick 50 or generic version) in my k7.
The Teflon really does help the stiction and give a smoother ride.
Hey Mark!
How are things in CO???

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Offline Jonesy

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Re: Fork oil mixture
« Reply #11 on: January 13, 2009, 12:07:39 PM »
Quote from: bikerdave47 on January 13, 2009, 06:49:30 AM
As original purchaser of a K2, manual calls for 7 oz. of 10w30 per fork...

10W-30.. I was close. Thanks for verifying.
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"Every time I start thinking the world is all bad, then I start seeing people out there having a good time on motorcycles; it makes me take another look." -Steve McQueen

Offline Hush

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Re: Fork oil mixture
« Reply #12 on: January 13, 2009, 12:53:12 PM »
Er yeah sorry guys you know I meant 10w/40 eh?
Typing in the dark at midnight will cause such erronious statements to occur.
The bike is an 82 Suzuki but the manual I have is a Haynes and yes it states a 50/50 mixture of 10w/40 and fork oil.
I'm confused now as to what to use?
It took me 2 weeks to figure out that 160cc was same as 160mls and that (according to Google) is a coffee cup full!
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I think the thing I most like about motorcycling is the speed at which my brain must process information at to avoid the numb skulls who are eating pies, playing the ukulele, applying make-up etc in the comfort of their airconditioned armchairs as they make random attempts to kill me!!!!!!!

Offline cbr-eric

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Re: Fork oil mixture
« Reply #13 on: January 13, 2009, 03:55:11 PM »
I actually had REALLY good luck with actual fork oil, spectro I think, in my other bikes.  with the change the front end actually seemed noticeably smoother. could just have been the fresh fluid, or the fact I went a little thinner than what was called for (5w instead of 10w)  but either way, it doesnt cost that much and does seem really smooth :)
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Offline HondaMan

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Re: Fork oil mixture
« Reply #14 on: January 13, 2009, 06:14:55 PM »
Quote from: hcritz on January 13, 2009, 07:20:27 AM
Hey Mark!
How are things in CO???

Hi, "H"!
I'm freezing parts of my anatomy off, and I wore out my snow shovel (does that mean winter is over now, no more snow?). I can't uncover any of the Hondaman Specials in back, because their tarps are all frozen to the patio. So, I'm rebuilding swingarms, at least when I can get the garage up to 40 degr-r-res or better.

How's it in Winter WondeRiderland? (I'm SO jealous...)
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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 Hush

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Re: Fork oil mixture
« Reply #15 on: January 14, 2009, 02:41:58 AM »
Are you saying it's cold HM? I had to go buy another fan just so I could sleep here in NZ, 30 degrees plus and Jan aint our hotest month!!
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I think the thing I most like about motorcycling is the speed at which my brain must process information at to avoid the numb skulls who are eating pies, playing the ukulele, applying make-up etc in the comfort of their airconditioned armchairs as they make random attempts to kill me!!!!!!!
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