Rear Shocks/Air - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 20 (permalink) Old 08-11-2011, 10:53 AM Thread Starter
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Rear Shocks/Air

I bought the bike at the end of last fall, and have put close to 1000 miles on it this summer. One thing I noticed, was that the suspension bottomed out very easily, and rode rough over bumps... especially with a passenger.

Then, I remembered that I had noticed Schrader (tire) valves on the shocks, so I decided to check their pressure. It was ZERO.

I didn't want to blow the shocks, so I decided not to use the big air compressor, but used a foot operated tire pump with a built-in gauge to air them up. I put 40psi in each, and now it rides like a dream! Even with a passenger!

Oh, I did NOT trust the gauge on the air pump, as some air leaks out when the clamp on tire chuck is removed. Instead, I used an electronic unit that just pushes against it, and doesn't leak hardly any air. The air pump would say 60psi before removing the chuck, but then lose down to 40psi when it was removed.

Just thought I'd share! Good Luck!

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post #2 of 20 (permalink) Old 08-11-2011, 11:05 AM
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I'm 250# and run 40-50 psi for comfort.

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post #3 of 20 (permalink) Old 08-11-2011, 11:08 AM
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Yep, but they are pretty darn good shocks, have you got the spring setting up to snuff for your load...??? There is a special shock pump that will not loose air and has its own gauge, you would probably need the one that goes to 60 PSI, (+/-$30)... If I remember right (CRS) I ran 30 PSI and my spring setting was the 2nd from firm (I weigh 225#), and when I took on a passenger (wife @ 150#) I would set the springs to the firmest setting... Man it hurts the ole spine when she bottoms out......
Have a good one...Old Dog...

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post #4 of 20 (permalink) Old 08-11-2011, 12:00 PM
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On the shock settings, which is the firmer? Number 1 or number 4? Had mine on 4 and she bottoms with me being the only passenger and I'm 220#. Gotta check the air pressure in a while to be sure it's holding. I had 40# in it last week and not too sure if they are holding the air.
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post #5 of 20 (permalink) Old 08-11-2011, 12:49 PM
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Many have found that theirs leak. The settings , 1-4 only adjust rebound dampening , so totally useless in keeping the shocks from bottoming out. 1 is "soft" and 4 would be "hard".

I personally could not tell any difference between 1 and 4.

I think the Max pressure for the shocks is 70psi. I would not go over 40...if you need to, you need stiffer shocks. I picked up a set of Progressive 412s, made a Huge difference....as you can't set preload on the stock ones they kinda suck.

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post #6 of 20 (permalink) Old 08-11-2011, 09:16 PM
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Mine ride pretty good on 4 (I'm 220lbs) but yeah they bottom out hard when you hit a large bump. Almost knocked the wind out of me a couple times. Havent tried to see if they hold air but I'm betting they don't

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post #7 of 20 (permalink) Old 08-11-2011, 09:30 PM
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I think KM above is right on the 4 settings, so I normally ran mine on 3 with 30 PSI...
And Devil Hwy, mine did good holding air, I would check them a couple of times a year and they seemed to hold good...
Have a good one...Old Dog...

Southern Central Tennessee.......
Now on the Dark Side......
Girl's Bike 09 Sporty xl 1200 Custom...33k + & clickin......
Sportster Owner/Rider since age 72...lol... Rider since Simplex...???
09-xl1200 "C" Vivid Black, Cast wheels w/19" Frt., SE-Stage 1+, X14iEDs...
MicroTach +, Higher wider H-bars, GPS Mt., Mustach bar Hwy. pegs...
Viking Shock cutout Saddlebags, Rear Mt. Signal Lt. Kit, Fork Brace...
RoadKing Air Shocks, Mustang Seat, Progressive Fork Springs...
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post #8 of 20 (permalink) Old 08-11-2011, 09:49 PM
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Quote:
Originally Posted by Knifemaker View Post
Many have found that theirs leak. The settings , 1-4 only adjust rebound dampening , so totally useless in keeping the shocks from bottoming out. 1 is "soft" and 4 would be "hard".

I personally could not tell any difference between 1 and 4.

I think the Max pressure for the shocks is 70psi. I would not go over 40...if you need to, you need stiffer shocks. I picked up a set of Progressive 412s, made a Huge difference....as you can't set preload on the stock ones they kinda suck.
KM is right about recommended pressure for the shocks.
From the Clymer manual, 0-43 psi is the usable range and 71 psi is maximum.
They also recommend for a rider weighing 150 lb to set the rebound damper on 2, and atmospheric pressure (0 psi).

I weigh ~ #300 and usually carried #20 lb of luggage tied to the seat or grandkids up to #100. I had the dampers set at 4 and ~40 psi in the shocks. That felt right to me, but I have very little other riding experience to compare it with.

Gordon

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post #9 of 20 (permalink) Old 08-12-2011, 11:07 AM
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The only time I notice any difference in firmness between 1 and 4 is with a passenger (probably something to do with more weight over the back end vs centered when solo), though I'm only 145# and the wife is 130#.

I put in 30 psi and it has held for two years, though I check at every oil change. I let the wife set the dials wherever she is comfortable, and it rides well.
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post #10 of 20 (permalink) Old 08-12-2011, 11:11 AM
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I've always wanted to build a crossover tube with one nipple. All my Hondas are built that way. Changing the damping fluid is a good idea for some of our older bikes.

95 VN750 (eBay)31k+
GL1100 front fender
OEM engine guard
OEM high back rest
'V-Twin' HWY pegs
Black 750 Spectre handlebars
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Bar Ends anti-vibe (JCW)
Emgo air filters
Tank bag-Eclipse
Tail bag-FroZone Cooler
Back Rest-Igloo 6 pak cooler
WalMart Saddle Bags
R/R Relocate
Dry Splines Lubed
AGM DieHard-Sears
Gutted Goat
Sporster XL Mufflers
LED's-stop,tail,turn,marker
Pickup coil mod to .45mm
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