Rear Shocks Air Balancing - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 19 (permalink) Old 05-17-2009, 10:46 AM Thread Starter
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Rear Shocks Air Balancing

I know that Progressive has a kit to allow to you fill both rear shocks at the same time with air also allowing you to have equal air pressures. The price seems a little high to me. Was wondering if anyone has got the parts seperatly and did it. I know I just need to replace the shocks period, but I can't swing it right now.
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post #2 of 19 (permalink) Old 05-17-2009, 11:58 AM
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I bought the kit over 3 years ago and I am very satisfied with it. Like you said it is a little pricey. I tried myself to find something that would work but could not find anything. I think you would have to have your own machine shop, or know somebody that works in one.

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post #3 of 19 (permalink) Old 05-17-2009, 01:40 PM
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23 bucks is a high price?

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You can buy the various fittings form one of several companies that makes air fittings for air driven components, but you will likely end up spending about the same money when it all adds up.

I didn't put one on my Vulcan cause I thought the way the tubes stuck out and looked were kinda cheezey, but I did have a simular kit on the air shocks on my 76 El Camino SS...which worked well...and on the front forks of my RD400.

My thoughts were adding more fittings to the system would just add more places to develop leaks, as the hoses could get caught or kicked by a passenger getting on/off the bike.

But 23 bucks is a fair price.



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Last edited by Knifemaker; 05-17-2009 at 01:44 PM.
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post #4 of 19 (permalink) Old 05-17-2009, 02:27 PM Thread Starter
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it seems pricey considering what it is. seems like there were would be parts for cheaper.
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post #5 of 19 (permalink) Old 05-17-2009, 03:02 PM
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To me the biggest problem is airing them up without putting too much in, and then losing it all when you remove the hand pump. There's a hand pump in the J&P cycles catalog that has a built in guage and an inline check valve that supposedly keeps you from having either problem for around $50. IMO that would be a better buy cause you need a good hand pump anyway for this and then you could match the pressure in both sides without adding other fittings/hoses. Again, just my opinion!

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post #6 of 19 (permalink) Old 05-17-2009, 03:10 PM
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You could probably fab one up with some scrap air pumps and some vinyl hose. One nozzle for each shock, a T connector, and a valve cut off a bicycle tire.

Or look on Ebay for a bicycle shock fork. They're small, have gauges and should go for around $15-20.

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post #7 of 19 (permalink) Old 05-17-2009, 04:41 PM
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I'm very apprehensive about these types of systems that allow you to fill more than one shock (or tire) at the same time because they don't always deliver equal pressure to all shocks (or tires). Many things can affect the distribution of air into something, such as weight, resistence, rust, lubrication, etc.. If you are only measuring the air pressure at the pump, you don't know for sure that there is equal pressure in both shocks. I put nitrogen in all 4 car tires on several vehicles. The dealer deflated/inflated all 4 tires together and measured the air pressure at the pump. I drove off thinking all was well, but my vehicle pulled a bit to one side. So I checked the pressure in all 4 tires and one tire was WAY OFF. I made them due it again and check all tire pressures, same thing. So they did just the one tire by itself after that. I think you're better off doing one shock at a time or rigging something up that includes a gauge for each shock.

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post #8 of 19 (permalink) Old 06-14-2009, 08:11 PM
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I dont have a hand pump, I do have a cigarette lighter powered tire inflator that takes forever to fill up even a front lawnmower tire. do you think a couple quick shots with it would be too much for the shocks?

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post #9 of 19 (permalink) Old 06-14-2009, 09:08 PM
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Quote:
Originally Posted by rubyrick View Post
I'm very apprehensive about these types of systems that allow you to fill more than one shock (or tire) at the same time because they don't always deliver equal pressure to all shocks ......


Actualy that is the very advantage of the system. I am not familar with whatever micky mouse device your guys filled your tires with, but I do know that if you take a tube and connect it between two seperate air chambers, the air pressure in each chamber will be exactly the same as the other. This is simple physics and kinda impossible to argue with.

The problem with our air shocks is the volume of air they hold is so small, so attempting to put the exact amount of air in each one is a bit troublesome.
Having a tube that connects between them with one schrader valve to add the air makes it pretty foolproof.

I would guess that in some garage where they use a multiple tire filling tool like you describe, it would be prone to wear, folks stepping on it and other misuses. A clear plastic tube you install new on your bike , actualy use infrequently and have controll of would likely not have these factors to contend with and should work as advertised.

I had such a system on my front of my race bike and it performed flawlessly. The simple physics of it meant that I had the EXACT amount of pressure in each fork, and that is almost impossible to achive with seperate fill valves.

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post #10 of 19 (permalink) Old 06-14-2009, 09:31 PM
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Two ways that I know to get close to the same amount of air is; 1) use and air tank fill tank to what pressure you want and air up one shock and repeat for the other. 2) use a pressure regulator on the compressor and set as dessired pressure and air up shocks.

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