Jump to content


Photo

Marzzochi Forks


  • Please log in to reply
10 replies to this topic

#1 b40rt

b40rt

    Advanced Member

  • Members
  • PipPipPip
  • 4,099 posts
  • Location:Edinburgh
  • Club:Foot.....Dalmellington.

Posted 09 July 2011 - 12:31 PM

What is considered the best set up for these forks ?

At present running 220ml of TQF (approx7w)and works OK, but open to suggestions.

I weigh about 13 stones.

The fork caps have a screw at the bottom, presumably to release pressure but seized solid at present, don't remember them having this, is it a modification ?

Thanks

Ross
Never argue with stupid people, they will drag you down to their level and then beat you with experience. Mark Twain


Ads By Google User is online

Ads By Google
  • Ad Bots


Don't want these Ads? Why not help support TC and sign up as a Trials Central Supporter?

#2 schweizmeister

schweizmeister

    Member

  • Site Supporter
  • 47 posts
  • Location:Mid Lothian
  • Bike:240 Fantic, TZ250
  • Club:Melville, SCRMC

Posted 11 July 2011 - 06:59 PM

I was watching your forks yesterday after we were talking and the rebound looked a little slow and 'lazy'. It might be worth fitting new springs.

#3 b40rt

b40rt

    Advanced Member

  • Members
  • PipPipPip
  • 4,099 posts
  • Location:Edinburgh
  • Club:Foot.....Dalmellington.

Posted 11 July 2011 - 07:37 PM

I was watching your forks yesterday after we were talking and the rebound looked a little slow and 'lazy'. It might be worth fitting new springs.


Thanks Brian

Will try and get a pair.

Ross
Never argue with stupid people, they will drag you down to their level and then beat you with experience. Mark Twain

#4 woody

woody

    Advanced Member

  • Site Supporter
  • 3,479 posts
  • Location:Birmingham UK

Posted 11 July 2011 - 08:19 PM

I have no idea whether ATF is suitable for forks or not but I would only use proper fork oil in them.

220 is probably the maximum you'd want, I usually start with 200cc of 10w and take it from there, adding another 10 if they feel like they are close to bottoming or topping but 200 usually is enough for me - but obviously all forks differ in their behaviour, even when they are identical in terms of components.

You could try WES progressive springs which you can get through BVM. At least you will know they are new and have not sagged, then it is just a case of playing with preload. A friend has some in his 240 Fantic and the forks are very good.

Or you could fit Magical front fork springs. No need to buy the caps with adjustable preload or the internal spacers as well, they are nice to have, not essential. You can make your own spacers.

With the WES or Magicals you would have new springs which would eliminate the springs from any performance issues.

#5 b40rt

b40rt

    Advanced Member

  • Members
  • PipPipPip
  • 4,099 posts
  • Location:Edinburgh
  • Club:Foot.....Dalmellington.

Posted 11 July 2011 - 10:01 PM

Thanks Woody, have sent an inquiry to BVM.

The springs have certainly lost a bit of life as it required little effort to put the caps back on.

There is a spacer fitted of approx 50mm in each leg,from memory I think that was standard ?(plus a 2p piece in one of them!)

Do you know anything about a pressure release screw in the bottom of the allan key recess ?

Thanks

Ross

Edited by B40RT, 11 July 2011 - 10:02 PM.

Never argue with stupid people, they will drag you down to their level and then beat you with experience. Mark Twain

#6 woody

woody

    Advanced Member

  • Site Supporter
  • 3,479 posts
  • Location:Birmingham UK

Posted 12 July 2011 - 12:32 AM

Do you know anything about a pressure release screw in the bottom of the allan key recess ?

Thanks

Ross


Not really as they differ from fork to fork. They are either a screw that you undo to bleed pressure build up in the forks. Or, they are a valve which is supposed to do that for you and let air, but not oil, out through a pin hole in the fork cap - in my experience this latter type, usually on Betor forks (Ossa, Bultaco) either block up or let oil out as well giving you an oil jet wash in the face every time the forks compress until finally they are empty. I always block the hole off and can't say that I've ever had a problem with forks pressurising.

#7 b40rt

b40rt

    Advanced Member

  • Members
  • PipPipPip
  • 4,099 posts
  • Location:Edinburgh
  • Club:Foot.....Dalmellington.

Posted 13 July 2011 - 10:07 PM

Not really as they differ from fork to fork. They are either a screw that you undo to bleed pressure build up in the forks. Or, they are a valve which is supposed to do that for you and let air, but not oil, out through a pin hole in the fork cap - in my experience this latter type, usually on Betor forks (Ossa, Bultaco) either block up or let oil out as well giving you an oil jet wash in the face every time the forks compress until finally they are empty. I always block the hole off and can't say that I've ever had a problem with forks pressurising.


Thanks Woody

The forks on my Aprilia do pressurize, to the extent that they will continue to leak sitting on a stand.

Not a problem with the Marzocci's I have to agree.

Ross
Never argue with stupid people, they will drag you down to their level and then beat you with experience. Mark Twain

#8 b40rt

b40rt

    Advanced Member

  • Members
  • PipPipPip
  • 4,099 posts
  • Location:Edinburgh
  • Club:Foot.....Dalmellington.

Posted 08 September 2011 - 09:17 PM

I got a new pair of fork springs from In Motion Bultaco as no one else seemed able to supply, and they were half the price.
Tried them with 200ml of oil but although much better, were topping out occasionally. Went back to 220 and cant fault them.
Surprised just how much better they are.
Thanks for the help / suggestions.

Ross
Never argue with stupid people, they will drag you down to their level and then beat you with experience. Mark Twain

#9 reginald

reginald

    Advanced Member

  • Members
  • PipPipPip
  • 146 posts
  • Location:Childers Queensland Australia
  • Bike:2 x SWM TL 320 1982;
  • Club:Rocky trials club; Central Qld.

Posted 10 September 2011 - 01:18 AM

Hi Ross any idea of the spring rates for those?
I have betor forks on both my TL320s and one pair has those little hex screws in the caps. The others have nothing.

I run straight atf oil but only cause of convenience of supply. Was going to try 5wt because as a C grader we don't big hits and the more supple the boingers the easier is to get grip I reckon.

Edited by Reginald, 10 September 2011 - 01:28 AM.


#10 b40rt

b40rt

    Advanced Member

  • Members
  • PipPipPip
  • 4,099 posts
  • Location:Edinburgh
  • Club:Foot.....Dalmellington.

Posted 10 September 2011 - 09:30 AM

Hi Reginald
In Motion could give you the rate I'm sure, your tall so them being to hard would'nt be a problem.
The springs are not specific to Marzzocci I don't think, just 35mm forks.
I'm also using ATF for the same reason, and according to a chart I saw should equate to approx 7wt,
though ambient temp must place a part so you should be fine, I find them very supple.


Ross
Never argue with stupid people, they will drag you down to their level and then beat you with experience. Mark Twain


Ads By Google User is online

Ads By Google
  • Ad Bots


Don't want these Ads? Why not help support TC and sign up as a Trials Central Supporter?

#11 reginald

reginald

    Advanced Member

  • Members
  • PipPipPip
  • 146 posts
  • Location:Childers Queensland Australia
  • Bike:2 x SWM TL 320 1982;
  • Club:Rocky trials club; Central Qld.

Posted 17 September 2011 - 08:19 AM

Cool thanks. I might stick to the ATF.




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users