Anti dive forks VF750

[Deano41]

Hi there
I'm after some help Regarding my recently purchased VF750,
When I brake the front end dives to the left! As you can imagine this is quite disturbing.
As far as I can figure out the anti dive system is based in the left hand fork leg, my guess is that this is not activating causing the dive to the left
If anyone else has experienced this and has a solution it would be much appreciated
Cheers

[Robby]

Classic motorcycle mechanics magazine has covered anti-dive a few times. The general consensus is that it can be fairly tricky to make it work again. Expect to spend some money on hard to obtain gaskets and seals, and maybe have some fun shimming things.

Does it have anti-dive units on both fork legs? It could be that the anti-dive is working, but one leg just has no oil left in it.

If you want to fix it properly, the solution is going to be a full rebuild of both fork legs including anti-dive units. There used to be kits available to blank off the anti-dive, which were popular.

[moonzoomer]

Does your model have air assisted suspension, is there any air in the forks?

[Deano41]

As far as I'm aware the anti dive system only in the left hand for leg, the right leg just follows the action of the the left, this is why I think the anti dive is faulty because of the pull/dive to the left, but I think your right a full for rebuild could be in order

[Deano41]

Not sure about the air ill check it out tomorrow,
Before I even start pulling them apart ill check the air and oil levels
I'm hoping its one of these ... A quick fix haha

[moonzoomer]

[stirlinggaz]

hi,
i had these anti+dive forks on my 1986 vfr700 .
were useless when i got the bike and equally useless after i had them servced.
they seem to use some sort of ball bearing with a couple of seals.
used to make a helluva bang when going over potholes, which amused me.
was advised to ditch them / i did, still have the originals in my garage,
cheers,
G

[RhynoCZ]

Hi, I had it on GPz550, the best thing to do is to take it off. I experienced what's it like a few times but then it got crappy and it started to be a bit unpredictable/dangerous. If I still had the bike, I'd put there some plugs instead of the antidive thing and put progressive springs into forks. I've actually never talked to anyone who'd liked the antidive system.

It is not worth the money nor your time trying to fix it.
____________________
'87 Honda XBR 500, '96 Kawasaki ZX7R P1, '90 Honda CB-1, '88 Kawasaki GPz550, MZ 150 ETZ
'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor

[moonzoomer]

[Pete.]

I'd have the cam covers off and inspect the camshafts before spending too much money. Even if it isn't rattling not the cams could be well down the road to ruin.
____________________
a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good

[Kickstart]

Hi

The Honda anti dive system was about the only production one that didn't have a lousy reputation. The caliper hinged a bit, pushing on a piston in the fork.

Is that the system on your VF?

However, the forks should move pretty much together (there are plenty of forks around with one doing the springing and one the damping, or compression damping in one and rebound damping in the other). Check that the wheel spindle is secure, that the front mudguard / fork brace is in place, not rusted and secure (if it just has an aftermarket mudguard with no fork brace then I would expect that to be the problem). And check that the forks are not twisted in the yokes.

All the best

Keith
____________________
Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[moonzoomer]

[Deano41]

Thanks guys for you help with this, I have got to the bottom of it the left hand leg had the incorrect amount of oil and the shrader valve core used to pump the fork up was faulty so a simple empty and re-fill of oil, new valve core, pump to the correct preasure and she's good to go .... Happy days .. Well it was! Whilst I had the front end off i decided to sort out the intermittent neutral light issue, I had the fuse cover off hoping it was a faulty fuse, I replaced one fuse switched the ignition on and bam one of the other keys touched the stearer and wiped everything out ... I know FM luck .. Has anyone else been this stupid (I doubt it) if so ha be I just blown the fuses or is it worse?
Again thanks for your help in advance