fork oil - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 27 (permalink) Old 04-22-2015, 01:31 AM Thread Starter
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fork oil

Is there any other type/ weight oil to use for the forks? None of the bike shops around me have 10w20 and I can't find any on amazon or ebay or walmart....they sell all other types but this one. I'm replacing my oil seals in case someone was wondering.
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post #2 of 27 (permalink) Old 04-22-2015, 02:40 AM
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Quite a few people have used Automatic transmission fluid with good results.

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post #3 of 27 (permalink) Old 04-22-2015, 07:21 AM
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Yep X2 on the atf. I have several sets of forks filled with the stuff and never had a problem.

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post #4 of 27 (permalink) Old 04-22-2015, 07:35 AM
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10w20 fork oil? How's that work?

Hard to believe none of the shops carry fork oil.....

I suggest straight 10w or 15w oil. 20w is kinda thick for our forks...

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Last edited by Knifemaker; 04-22-2015 at 07:40 AM.
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post #5 of 27 (permalink) Old 04-22-2015, 08:14 AM Thread Starter
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The manual for the bike says to use 10w20....I know it's an off type. All the shops carry different weights but that kind. I would try the trans fluid but that stuff isn't cheap. Most likely will pick up some of the 10W or 15w oil. Not sure what difference it makes though. Isn't the oil only in there to keep the spring and shafts lubed?
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post #6 of 27 (permalink) Old 04-22-2015, 08:45 AM
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Quote:
Originally Posted by ridgegilt View Post
The manual for the bike says to use 10w20....I know it's an off type. All the shops carry different weights but that kind. I would try the trans fluid but that stuff isn't cheap. Most likely will pick up some of the 10W or 15w oil. Not sure what difference it makes though. Isn't the oil only in there to keep the spring and shafts lubed?
I believe you'll find atf to be cheaper than fork oil. Not really the point though, it acts as a lubricant for sure but the oils most important function in forks is to flow through tiny holes in the dampening rods at a reduced rate of flow in order to dampen the front forks and let them serve as a spring/ shock, combo.. Are you sure you didn't misread the specs. Could it have said 10w,20w? Meaning either of the two. I've never seen multi viscosity fork oil..




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post #7 of 27 (permalink) Old 04-22-2015, 10:19 AM
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From what I've read....Kawasaki references 10w20 fork oil in MANY of their various manuals and, at one time, sold it. But they no longer do.

Some places do make "duel viscosity" fork oil. Pretty hard to find it seems......Unless you're in the UK:

http://www.getgeared.co.uk/PROCYCLE_Fork_Oil_SAE_10W-20

Do note that "weight" as far as fork oils go seems to be a very non standardized thing. One company's 10w might be exactly like another companies 15w. Here's a link to a chart showing the vast differences in what's on the bottle and what the actual tested viscocity is:

http://mahonkin.com/~milktree/motorcycles/fork-oil.html


That's why for 40 years I only use Bel-Ray fork oil....not that they are more accurate, but I know how they behave and can thus have a better reference point to start with.

Multi viscocity fork oil does make a bit of sense...as single weight oils viscocity would change as they heat up, a well engineered multivis would behave the same ....from when you started out on a cold morning and then ended on a hot day riding a bumpy road. The forks do in fact heat up from use, just not sure on a normal street bike if that tempature increase would make that big of a difference......

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Last edited by Knifemaker; 04-22-2015 at 10:32 AM.
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post #8 of 27 (permalink) Old 04-22-2015, 10:23 AM Thread Starter
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I copied the section of the manual. What do you think? Am I misreading it?

https://docs.google.com/file/d/0Bwkr...p=docslist_api
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post #9 of 27 (permalink) Old 04-22-2015, 11:15 AM
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Quote:
Originally Posted by ridgegilt View Post
I copied the section of the manual. What do you think? Am I misreading it?

https://docs.google.com/file/d/0Bwkr...p=docslist_api
No you're not. As I said you'll see this in many manuals by Kawasaki. Same question has been asked on most of their forums for many of their bikes.

I'd suggest if you are taking the forks apart to use something in the range of BelRay 10w oil, (see chart I posted) and I strongly recommend installing a set of Progressive fork springs....

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post #10 of 27 (permalink) Old 04-22-2015, 11:43 AM
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I agree 20w is a little thing for our forks.. got it in mine now, and will be changing to 10 next time I do workn on them

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