Adjusting Rear Shocks - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Wheels, Suspension and Brakes
Everything to do with wheels, tires,
suspension, forks and brakes

 
LinkBack Thread Tools Display Modes
post #1 of 5 (permalink) Old 03-24-2009, 10:34 PM Thread Starter
Love My Baby
 
rubyrick's Avatar
 
Join Date: Jun 2008
Location: Hollywood, Florida
Posts: 1,165
iTrader: (1)
   
Adjusting Rear Shocks

Want to adjust my rear shocks to 20 PSI before taking a long ride (400 miles round trip) with a passenger and some light luggage. Trouble is, all I've got is a regular bicycle pump and tire gauge. Pretty sure I'm supposed to use a shock pump and gauge, but does it REALLY MATTER ALL THAT MUCH?

If it does, I'll have to go to AutoZone or Pep Boys and buy a shock pump with a built-in gauge. Is it worth it?

Will 20 PSI make a big difference, or should I go for more? It's at atmospheric pressure now, and I'll have a touch over 300 lbs total weight, including me, my passenger and some luggage.

Rubyrick

MY BABY...
'05 VN750
16,000 miles +
Kawi tank bib
Kawi rear rack
Small windshield
DEKA M/F battery
VN750.com Grill Cover
LED license plate frame
Clear Alternatives LED brake light
Cortech mini tank bag on rear rack
Pirelli MT66 Tires: 110 front / 150 rear
Splines lubed when tires installed at 10,650 miles
Splines lubed again at 14,400 with stubby valve stem install

Place your mouse on the X below and drag to the O

X
Even though you can't see Him, GOD is there! O
rubyrick is offline  
Sponsored Links
Advertisement
 
post #2 of 5 (permalink) Old 03-24-2009, 11:34 PM
Members who have donated towards server costs
 
denny6006's Avatar
 
Join Date: Mar 2009
Location: InezKY pop.600
Posts: 5,236
iTrader: (9)
     
Garage
twenty psi sounds to me like it will make a pretty big difference,and if you are careful I think about any kind of hand pump will do,just don't stick an air hose on it,you probably won't be able to control it,unless you have a low pressure regulator that will turn down to th pressures you are looking,Like say for an airbrush or paint gun,the han pump is the easiest to control though an you already own one,always a plus,Denny P.S. Amen to the last part of your signature




If you see it on my bike I did it
VROC#30324
92 vn750(sold)
Current ride 05 1500 Classic FI
lovin' the new scoot



Quote:
"When all is said and done,usually more is said than done" UNK
Click on one x and drag to the other to read between them.

Psalm 40:1...
XI waited patiently for the Lord; and he turned unto me, and heard my cry. X
denny6006 is offline  
post #3 of 5 (permalink) Old 03-25-2009, 01:11 AM
The Professor
 
lance328's Avatar
 
Join Date: Feb 2008
Location: BUFORD, GEORGIA
Posts: 3,147
iTrader: (15)
   
Quote:
Originally Posted by rubyrick View Post
Want to adjust my rear shocks to 20 PSI before taking a long ride (400 miles round trip) with a passenger and some light luggage. Trouble is, all I've got is a regular bicycle pump and tire gauge. Pretty sure I'm supposed to use a shock pump and gauge, but does it REALLY MATTER ALL THAT MUCH?

If it does, I'll have to go to AutoZone or Pep Boys and buy a shock pump with a built-in gauge. Is it worth it?

Will 20 PSI make a big difference, or should I go for more? It's at atmospheric pressure now, and I'll have a touch over 300 lbs total weight, including me, my passenger and some luggage.
Proper air setting is 10 percent of rider and carry on weight, I.E 300 lbs. = 30 psi. in shocks, set rebound dampening setting at 3.


85 VN700 "Old Yella"

REBUILT ENGINE
CUSTOM PAINT
VANCE & HINES CRUZERS
EAR SHAVED AND RE-JETTED W/K&N'S
DUNLOP ELITE K591 FRONT & REAR
VOLTMETER
SYNTHETIC BRAKE FLUID
SYNTHETIC OIL & GEAR LUBE
PLEXISTAR 2 WINDSHIELD
SPLINES LUBED
ACCT'S GREASED W/TOC SPRINGS
COASTERD
LEATHER SADDLE BAGS
LEATHER TOOL AND ROLL BAG
PICKUP COILS GAPPED AT .018"
NGK CAP, WIRES, IRIDUMS
BARNETT FRICTION PLATES & SPRINGS
CUSTOM GRIPS, MIRRORS, LEVERS
ORIGINAL STATOR & R/R 14.5v
DEKA MF AGM ETX15L

Best Auto/Moto Insurance | Motorcycle Protection Today | FREE Trade-In Quote
lance328 is offline  
 
post #4 of 5 (permalink) Old 03-27-2009, 10:11 PM
Old Fart
 
Knifemaker's Avatar
 
Join Date: Jun 2004
Location: Catawissa, MO
Posts: 11,644
iTrader: (4)
     
Garage
A bicycle pump is fine, you just do not want to use a high pressure air hose like they have at a garage.

The real problem is the shock is so small it is hard as hell to get the amount of air you want in the shock...because when you remove your pressure gauge to check it, it loses quite a bit of air.

My solution was to fill it abit over what I wanted and then take readings to check how much air I lost yanking my gauge off.

For instance, say I wanted 25 psi in each shock. I filled it with around 40 lbs of air and then took readings with the gauge. First check showed 35 psi, but when checked again it showed 28 psi due to the loss of air removing the pressure gauge. Another check now showed 21 psi, the next about 14...so, I could see that each time I checked the pressure with my gauge I lost about 7 psi just taking the gauge off.

So, I filled the shock with near 40-50 psi and then checked the pressure again, but stopped when the gauge said I had 32 psi. Because I knew I lost about 7 psi taking the gauge off, and that meant I now would have 25 lbs in the shock.

And yes, most go by "Knifemakers Rule" and add up the total amount of weight going on the bike -passenger , piliot and luggage. and use 10% of that figure for the amount of air in each shock in psi. Those adding hard cases should weigh the luggage empty along with the needed mounting hardware and remember to add that to the figure also.

And do not go by your weight stepping on that bathroom scale getting out of the shower. Put on all your gear, boots to helmet and weigh yourself then.



KM

If You Are Not Sure If I Am Joking or Not....I AM !!Photos:
http://www.flickr.com/photos/knifemaker1954/sets/

Last edited by Knifemaker; 03-27-2009 at 10:17 PM.
Knifemaker is offline  
post #5 of 5 (permalink) Old 03-29-2009, 10:59 PM Thread Starter
Love My Baby
 
rubyrick's Avatar
 
Join Date: Jun 2008
Location: Hollywood, Florida
Posts: 1,165
iTrader: (1)
   
Thanks guys. But I had to go and AutoZone and PepBoys both didn't have a shock pump, so I took off without adjusting the shocks. Just put the dampeners on 4. The ride was okay but probably would have been a bit nicer with some air in the shocks. I'm going to my bicycle shop Monday, they have a shock pump for a mountain bike that has a built-in gauge and a quick release that won't loose much air. Then I'll play with it a bit like knivemaker said, just to get to know how much air pressure is lost when disconnecting.

Thanks...

Rubyrick

MY BABY...
'05 VN750
16,000 miles +
Kawi tank bib
Kawi rear rack
Small windshield
DEKA M/F battery
VN750.com Grill Cover
LED license plate frame
Clear Alternatives LED brake light
Cortech mini tank bag on rear rack
Pirelli MT66 Tires: 110 front / 150 rear
Splines lubed when tires installed at 10,650 miles
Splines lubed again at 14,400 with stubby valve stem install

Place your mouse on the X below and drag to the O

X
Even though you can't see Him, GOD is there! O
rubyrick is offline  
Sponsored Links
Advertisement
 
Reply

Bookmarks

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

Once registered, your User Name"cannot be changed". We can make exceptions within 7 days, but after that, it is set in stone.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome