Fork leg air pressure? - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 4 (permalink) Old 08-02-2010, 10:25 AM Thread Starter
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Fork leg air pressure?

The front end of the 1990 VN750 I just bought seems exceedingly soft. My technical manual says that if I unscrew the caps at the top of the fork legs, a schraeder valve will allow me to add some pressure to the chamber of each leg. I unscrewed the caps at the top of the legs, but... no valve! There's something that looks like a valve (it's threaded), but there's no hole, no pin; in short, it's not a valve. Anybody know if I can get more stiffness in there without changing the springs? Thanks!
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post #2 of 4 (permalink) Old 08-02-2010, 11:53 AM
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I believe only the first few years had the fork valve. Heavier weight oil might stiffen it up some. Is it possible that some of the oil in there has leaked out?

I'm keepin' all the left over parts. I'm gonna use 'em to build another bike!
"Black Beauty"
1989 VN750 acquired December, 2008, 6,711 miles
Currently 23,298 miles

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2001 Honda CMX250 Rebel acquired July, 2008

1987 VN750 project bike, acquired August, 2009, 33,000 miles and balancer sticking out of the case, currently awaiting attention and parts
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post #3 of 4 (permalink) Old 08-02-2010, 01:28 PM Thread Starter
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Quite possible. I will check/change the oil and see how it feels. Was hoping there was some secret spot on the fork where I could adjust the stiffness and rebound (like on my mountain bike). If that doesn't work out, I guess there are new springs in my future...
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post #4 of 4 (permalink) Old 08-02-2010, 11:15 PM
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I think the fork tube air valve was only used for about the first three years, `85-87'
Heavier fork oil will only slow the rebound, not give you stiffer springs.

I think I read a thread a while back about putting a different spacer in the top of the tubes to stiffen up the springs.
If I can find the link, I will post it.


1991 VN 750 -"Cosmic Lady" or "Bad Girl"?
Purchased May 16, 2008
Approx.19,300km (12,000 miles)

H-D windshield
Relocated R/R
MF-AGM battery
Fiamm Freeway Blaster horns
F&S luggage rack and engine guard
Kury Offset Hiway pegs
July 13, 2016, Riding on the DARKSIDE now, Classic Radial 165/80-15


Last edited by OlHossCanada; 08-02-2010 at 11:22 PM.
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