anti diving remove

[gilou]

hi i started checking my bike, one first problem i have to make an order to buy new brakes durit ; will i have to buy some for the anti diving system ( i saw that it was not a good system , can we remove it i'd choose this solution if it's possible , more easy than buy a new fork)

[fj11.5]

Can be removed ,not sure if u can buy block off plates for the fork legs or have them made, is possible to change fork lowers if u plan on upgrading the front wheel

[moparman70]

I always just shut it off for the most part by turning the knobs at the end all the way closed

[gilou]

so is it possible to put plugs instead of the small hoses coming from the brake ?
what oil do you use ?

[FJmonkey]

hi i started checking my bike, one first problem i have to make an order to buy new brakes durit ; will i have to buy some for the anti diving system ( i saw that it was not a good system , can we remove it i'd choose this solution if it's possible , more easy than buy a new fork)

You can get Block-Off plates, or make them. They need to have a channel from one port to the other to prevent fluid lock (effectively have solid forks). If you are good at fabricating parts with O-Ring seals or other kinds of seals, then you will be set. Otherwise consider upgrading to 89 or newer forks and get a wider front wheel to boot.

[Flying Scotsman]

Changed my seals on my 85 and they work great now.Anti dive still installed.They were bad.Just did my 90 and they work great now too.Seals are cheap and new forks not so much so its worth rebulding IMO.

[flips]

Hi there.
I know that most would disagree....but my 2c worth...
I actually like the anti dive setup...but only since rebuilding the forks with a  heavier than recommended blend of fork oil (a 50/50 mix off 10 & 15w ),progressive fork springs,s/steel brake lines,an fjr1300 master cylinder (got one for the clutch as well ,works well),and a grippy tyre ( I like the metzeler lasertech).After some adjustment of the anti dive unit I can grab a handfull of brakes get a slight chirp from the front tyre and pull up very well with still enough feel in the lever (not possible with the standard master cylinder) for good control.
I have no doubt that the later model brakes are superior though.I also have a 98 thunderace,but its a bird of a different feather.
Cheers
Jeff.P

[gilou]

hi i started checking my bike, one first problem i have to make an order to buy new brakes durit ; will i have to buy some for the anti diving system ( i saw that it was not a good system , can we remove it i'd choose this solution if it's possible , more easy than buy a new fork)

You can get Block-Off plates, or make them. They need to have a channel from one port to the other to prevent fluid lock (effectively have solid forks). If you are good at fabricating parts with O-Ring seals or other kinds of seals, then you will be set. Otherwise consider upgrading to 89 or newer forks and get a wider front wheel to boot.

hi fjmonkey the idea was to keep the aluminium body without the parts inside , more easy for me than build block off plates; do you think it's a good idea ?  


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[SlowOldGuy]

How do you intend on sealing that top part?  The anti-dive plunger sealed it originally.  It is not meant for pressure, see that little weep hole?  It is there because water could leak into that area.  If you leave it open, that area will be subjected to a lot of fork oil pressure and will probably leak like crazy. 

I forgot what the internals look like, but can you grind off the tapered part of the plunger (that has been removed) so fork oil flows past it readily, but it will still seal the body of the A/D unit?

That may be confusing.  Ask more questions if you need to.

DavidR.

[rktmanfj]

Otherwise consider upgrading to 89 or newer forks and get a wider front wheel to boot.

FWIW, The stock 89 & up wheels are also 3".

Randy T
Indy

[FJmonkey]

hi fjmonkey the idea was to keep the aluminium body without the parts inside , more easy for me than build block off plates; do you think it's a good idea ?

San_Dimas Mike put block off plates on his 86' forks. They were way over engineered, but they worked. I have some 89 forks from Simi_Ed so no Anti-Dive for me, plus 3" wide front. I don't know enough on the internals to help you. I think if you have the bits apart you can drill a hole somewhere and kill the system. The block off plates means you can remove some un-sprung weight as a bonus. 

[RichBaker]

Otherwise consider upgrading to 89 or newer forks and get a wider front wheel to boot.

FWIW, The stock 89 & up wheels are also 3".

Randy T
Indy

But 17" vs 16"......

[FJmonkey]

Otherwise consider upgrading to 89 or newer forks and get a wider front wheel to boot.

FWIW, The stock 89 & up wheels are also 3".
Randy T
Indy

But 17" vs 16"......

Oh Yeah, and the 17" wheel to boot, better rubber on the road and all that. Though I have good rubber with the Avon's AV46 front for the last few years. I have a spare if I move to 17" quick enough.

[gilou]

How do you intend on sealing that top part?  The anti-dive plunger sealed it originally.  It is not meant for pressure, see that little weep hole?  It is there because water could leak into that area.  If you leave it open, that area will be subjected to a lot of fork oil pressure and will probably leak like crazy. 

I forgot what the internals look like, but can you grind off the tapered part of the plunger (that has been removed) so fork oil flows past it readily, but it will still seal the body of the A/D unit?

That may be confusing.  Ask more questions if you need to.

DavidR.

you ,are right i saw the small hole , it can be sealed with the rubber part

[gilou]

in europe you have to be careful  with the law for exemple if you change wheels or tyres in case of accident the insurance doesn't works