Air pressure for rear shocks - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 11 (permalink) Old 01-04-2008, 12:07 PM Thread Starter
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Air pressure for rear shocks

Once and for all... I've heard so may diffferent numbers floating around for the correct air pressure for the rear shocks. Please, what's the proper formula for figuring this out? It's not listed in the owners manual or the Klymer book.It only says not to exceed 71 psi. I know to use the correct pump for the job but I'm a little confused about the amount of air. HELP!

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post #2 of 11 (permalink) Old 01-04-2008, 01:37 PM
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I remember reading somewhere (maybe here) that you add 1 pound of pressure for 10 pounds of body weight per shock. I have my rear shocks set at 20 pounds but hopefully I can lower that before to long.

Last edited by Jim8208; 01-04-2008 at 02:53 PM.
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post #3 of 11 (permalink) Old 01-04-2008, 02:50 PM
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You can download a copy of the service manual if you don't already have one. I don't have mine handy right now...

'92 Vn750

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post #4 of 11 (permalink) Old 01-04-2008, 03:23 PM
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Yes, the Knifemaker formula is add 10% of total load in pounds to each shock...

e.g. ..If your weight 180 lbs (with gear) and put 20 lbs of crap in your saddlebag, that equals 200lbs total load-10% of that is 20 , so put 20 psi in each shock. DO NOT USE A GAS STATION HOSE OR ANY BIG COMPRESSOR TO FILL THE SHOCK. a bicycle hand pump works fine..
You may have to check the pressure a few times to see if you are losing any air when you check it with your gauge. The shock is small and can lose alot of psi this way, I had to fill it 6lbs over what I wanted because I was letting it out with my gauge.

Regardless of what the manual says, I would not put more than 50 psi in the shock.

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post #5 of 11 (permalink) Old 01-04-2008, 06:36 PM
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Has anyone installed a crossover tube connecting both shocks to balance the air pressure? I have a scrap 750 Spectre that has that set up on it and would like to do the same after I hear some feedback from you all.

DT

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post #6 of 11 (permalink) Old 01-04-2008, 07:14 PM
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Quote:
Originally Posted by dirtrack650 View Post
Has anyone installed a crossover tube connecting both shocks to balance the air pressure?
Sounds like a good idea. I don't see why it wouldn't work.


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post #7 of 11 (permalink) Old 01-04-2008, 07:38 PM
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Mine feel like they have 100 lbs in them.


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post #8 of 11 (permalink) Old 01-04-2008, 07:57 PM
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Quote:
Originally Posted by dirtrack650 View Post
Has anyone installed a crossover tube connecting both shocks to balance the air pressure? I have a scrap 750 Spectre that has that set up on it and would like to do the same after I hear some feedback from you all.

DT
You could use one of those set ups that the truck driver use to connect two tires stems together. This way they have easy access to the stem and air up both tires at one time.
Also one can incorporate an air gauge in line to it.

02 honda sabre 1100
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post #9 of 11 (permalink) Old 01-04-2008, 08:29 PM
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Quote:
Originally Posted by dirtrack650 View Post
Has anyone installed a crossover tube connecting both shocks to balance the air pressure? I have a scrap 750 Spectre that has that set up on it and would like to do the same after I hear some feedback from you all.

DT

Yes, it has been done. (I had it done to my front forks on another bike)
Progressive even sells an inexpensive kit to do this. ( a clear air line goes from each shock to a central block with a schrader valve for filling.)
Never got aronnd to doing it on my Vulcan, but part of the problem was the top of the shocks take up some space and adding a elbow and a hose to each one would just have it sticking out even more and there ain't alot of room there to begin with. So, I just bought diffrent shocks instead.
You still have to use the same reccomended pressures (20lbs of air is 20lbs of air even if split between the shocks).
I had air shocks on my El Camino that worked the same way...one of the "bolts" to the rear licence plate was really a schrader valve for filling.
The Vuclans rear shocks are , to say it nicely, crap, so replacing them is the better route...

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post #10 of 11 (permalink) Old 01-05-2008, 12:14 AM
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Quote:
Originally Posted by Scoop View Post
Mine feel like they have 100 lbs in them.

am i the only 1 that caught that??? lol

1990 Kawasaki Vulcan 750

.... slightly modified
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