Rear Shock' oil change - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 42 (permalink) Old 02-06-2009, 07:29 AM Thread Starter
 
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Rear Shock' oil change

I've just spoken to Kawasaki Germany about the rear shocks and that oil came out of the air valves. No problem. It is possible to change the oil filling
in the rear shocks.

1. Screw of the valves
2. Turn the shocks upside down and drain off the oil.
3. Put fresh oil into the shocks through the opening where normally the airvalve is.
4. Screw on the air valve

Viscosity: SAE 5W (Forkoil is just fine)
Quantity: 142 +- 2,5 ccm
Air chamber: 88 ccm

I will take 10W20 Forkoil to optimize the damping.
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post #2 of 42 (permalink) Old 02-06-2009, 11:04 PM
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After seeing a couple of posts on this, I figured I'd post a link to this page:

http://faq.ninja250.org/wiki/ZX600_shock_oil_change

And here's another, same concept:

http://www.ldrider.ca/techpages/rearshockoilchange.htm


Yes, I know, it's not a Vulcan shock, but the principles are exactly the same. I did not have a syringe for inserting the new fluid so I used a straw (can't remember if it was a coffee stirrer or a wd-40 spray straw) and a container with a very small pouring lip (came with my iron). Worked beautifully.

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post #3 of 42 (permalink) Old 02-07-2009, 08:40 AM Thread Starter
 
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O.K done.

All you need is this:



1. Screw off the air valve
2. Srew the syringe-tip where the air valve was
3. Put the Damper upside-down
4. Press air into the damper several times an let the oil drain into the syringe
5. When no more oil drains out, the damper is empty
6. Put fresh oil into the syringe
7. Srew on the syringe again an put the oil into the damper. Just pump a little and let the air come out of the damper, then press again, so that the air goes into the syringe

I've used a 7.5 W Forkoil. This shoulb be 50 % heavier than the original 5 W.
Filling 142 - 145 ccm
Ready.

Last edited by T.o.m; 02-07-2009 at 08:43 AM.
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post #4 of 42 (permalink) Old 02-07-2009, 09:39 AM
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I get used syringes from my vet for such applications. Also come in handy when adding water to batteries (not everyone has MF) or any application when you need precise dispensing.

I'm keepin' all the left over parts. I'm gonna use 'em to build another bike!
_____________________________________________
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1989 VN750 acquired December, 2008, 6,711 miles
Currently 23,298 miles

Old Blue
2001 Honda CMX250 Rebel acquired July, 2008

1987 VN750 project bike, acquired August, 2009, 33,000 miles and balancer sticking out of the case, currently awaiting attention and parts
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post #5 of 42 (permalink) Old 02-07-2009, 10:33 AM
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Quote:
All you need is this:
Next time I change the shock oil I must get me one of those! Would have saved a lot of work!

I think it would have other good use as well, for instance diluting pesticide/herbicide.
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post #6 of 42 (permalink) Old 02-07-2009, 02:34 PM
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I `ve got a fairly large one from a vet friend, that I plan on using as a vacumn source for the fuel petcock when needed for carb maintenance, etc.

Gordon

1991 VN 750 -"Cosmic Lady" or "Bad Girl"?
Purchased May 16, 2008
Approx.19,300km (12,000 miles)

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TOP TEN THINGS A NEW RIDER/OWNER SHOULD DO. Click on link.
https://www.vn750.com/forum/11-vn750-general-discussion/9127-top-ten-items-you-would-suggest-new-owner-do-his-new-ride.html
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post #7 of 42 (permalink) Old 03-30-2009, 01:14 AM
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So in the write up from the ninja 250 page they said something about changing the spring. Now can we do just that on ours?
In that write up they are using a ninja600 shock to convert the 250 to a better shock and lower and allow for 2-up adjustability.
Is it that important on ours to change the shock oil?
How much does it hold?
And which weight to go with?

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Last edited by Jace Bror; 03-30-2009 at 08:46 AM.
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post #8 of 42 (permalink) Old 03-30-2009, 09:55 AM
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The reasoning behind swapping the shock from a ZX6 onto the Ninja 250 is that the stock shock is only *barely* adequate if you weigh like 120 lbs. The reason for the oil swap is the age of hte shocks being swapped in. The ones that fit are close to 20 years old, and you rarely know how many miles were on the bike it came off of.

I don't know that you could change the springs on the VN, I mean it can probably be done, but you would need some serious tools specific to doing it, so the cost/benefit is prety lopsided. Changing the oil in the shock is a good idea of you have a lot of miles on the bike or want to "freshen up" the rear a little. Of course, how many of us are sensitive enough to be able to tell the difference if the changes are only subtle?

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post #9 of 42 (permalink) Old 03-30-2009, 11:10 AM
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I used to own a 250. It wasn't that bad, even with 2 people. I did think about doing this mod when I had the bike.
I understand about changing the oil. I have about 9k on my bike but it is a 2000 so the oil is old. what weight of oil would be better though? And how much? Cuz the write up is for a different shock.

Last edited by Jace Bror; 03-30-2009 at 11:27 AM.
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post #10 of 42 (permalink) Old 03-30-2009, 12:06 PM
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When I rebuilt my zx6 shock I used Kyaba racing shock oil. No weight was listed on the package, but it seemed fine for my needs. Some people have used fork oil. Your localdealer should have some in various weights - it just happened that the dealer where I was when I remebered I needed it ony had the racing type (small dealer).

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