Helping out a soft front suspension - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 5 (permalink) Old 01-24-2008, 01:46 AM Thread Starter
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Helping out a soft front suspension

So the 750 doesn't have air up front and progressive springs can be spendy for some people's budgets. Has anyone here put VW valve springs in their fork tubes to boost a sagging front end? The was a Wing trick for the older models before they got air.

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post #2 of 5 (permalink) Old 01-24-2008, 04:11 PM
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You can try heavier oil and/or more preload..never heard of using VW springs..seems like you'd need alot of valve springs to replace the stock length...and if you just mean putting them on top of the stock spring...that would be the same as adding more preload.

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post #3 of 5 (permalink) Old 01-24-2008, 05:23 PM Thread Starter
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I saw the idea in my clymer 75-82 wing repair book. I like the rebound of our forks with 10-20wt fork oil, but at 250 lbs, my front end is down a bit. I did a thread earlier this year about putting air forks on a 750 but that ran into a dead end. If preloaded, will they bottom out sooner? I think the idea of adding the valve spring on top of the stock spring is to create a poor man's progressive.

Has anyone changed the oil in their rear shocks to improve their worth, or do we replace them?

Ideas please...

95 VN750 (eBay)31k+
GL1100 front fender
OEM engine guard
OEM high back rest
'V-Twin' HWY pegs
Black 750 Spectre handlebars
SunPro Volt Meter (Amazon)
Maier bug shield (JCW)
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
Silverstar headlight
Rotella T6
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post #4 of 5 (permalink) Old 01-24-2008, 08:25 PM
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Quote:
Originally Posted by dirtrack650 View Post
....... If preloaded, will they bottom out sooner? .....Has anyone changed the oil in their rear shocks to improve their worth, or do we replace them?
Addiing preload will do the opposite, make the forks harder to "bottom out"
I installed the Progressive springs, and they require you to cut down the stock spacer as they are longer springs. Progressive reccomended cutting the spacers to 7". A few others , along with myself.... left them a bit longer @ 7-1/4 to 7-1/2 "...providing more preload. You can retain the stock springs and simply add say, an inch of the proper sized washers on top of each spring to preload them.
This will effectivly make them a bit harder to compress. There of course is a limit on how much preload you can use, as you would not want to have the spring compress till it is completely bound before you reached the limit of available fork travel.
If the valve springs are stiffer than the fork springs, you are in essence just adding preload to the stock spring. If they are lighter weight than the stock fork springs, you are not accomplishing anything except adding the comprressed height of the valve spring as a preload.
If your really want to make the forks a bit stiffer, add the washers as outlined above.


Most that do not like the stock rear shocks simply replace them, but there have been a few that have replaced the oil in them. It did not make them any better however...

KM

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post #5 of 5 (permalink) Old 01-25-2008, 12:56 PM Thread Starter
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Thanks KM. My best bet would be to drop some of my own tonnage ;-)

95 VN750 (eBay)31k+
GL1100 front fender
OEM engine guard
OEM high back rest
'V-Twin' HWY pegs
Black 750 Spectre handlebars
SunPro Volt Meter (Amazon)
Maier bug shield (JCW)
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
Silverstar headlight
Rotella T6
dirtrack650 is offline  
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