New fork springs for Marzocchi 38mm forks

W

whitedog

Full member
Evening chaps,,

Im in need of some new fork springs.. Can anyone recommend a uk supplier
I tried Hagon as they do stock a spring for this fork type, but from their response email it sounds
as if they are not confident it will be adequate for my bike, which i thought strange.. Anyway, if
anyone knows of another supplier whom they would recommend, i'd be obliged

regards

Dave
 
I have Hagon's in my 81 Jota front forks
lot larger diameter then standard
work great
but don't know the number offhand, sorry
 
I got some original Marzoc ones from Wolfgang...just make sure you get the right length ...unless you want to mess around with more spacers etc
Nick7
 
laverdakeith said:
  Hi David, I have a couple of new sets of OEM springs, PM for details if interested.

     Keith
Click to expand...

If you choose not to go down the OEM route, which might be the simplest, I too use Racetech on a non std bike.
I bought them mail order from PDQ in Slough.
PT number FRSP S3234 085    Prepare to do some work as they are completely different to the originals, wider, shorter with longer preload spacers, I think around ?85

085 denotes the Spring rate, single rate spring probably heavier than the original progressive. You can chose heavier 090 or lighter 080 but you only get one crack at it for your cash !  ;)
 
the 085 is a 0.85kg spring rate
stock springs are a heavy single rate low performance item
the race techs have fewer coils and are much lighter
if you go with modern springs they will displace less oil and
the oil volume required will not be the same as the factory recommended amount
the race tech springs are 31.7mm OD and 340mmlong
you'll need to make longer preload spacers
retail in america is $110 a pair
the available rates are .80kg to 1.0 kg in .05kg increments
there is a spring rate calculator here:
http://old.racetech.com/evalving/SpringRateCalculation/dirtspring.asp?brand=Laverda&yr=78-82&ml=Jota%201000&formuse=form1&SpringType=Fork&bikeid=400
cheers,
scott
 
jotacorsa said:
the race techs have fewer coils and are much lighter
cheers, scott
Click to expand...

Hi Scott, only half right there - [using 0.9kg/mm as a reference] there is little weight difference between the Racetech and OEM springs - although the Racetech is shorter with less coils, it has a greater outside diameter and uses just about the same amount of steel.

I will try and find my weight measurements and post them, but they are definitely close, I remember clearly because I was disappointed in this respect when the RT springs arrived.  :(

Paul H
 
.... and RT 0.9kg/mm are too stiff, at least for me, I like a soft compliant ride. Rob, did you ever try the 0.8, or, are you still on 0.85? Would be interested in your findings if so.

P
 
I have the .9 spring in my 3C,it was to soft for me at my weight,120kg.It needed a stupid amount of preload to get the sag right,scary doing up the caps for fear of a  crossthread.Fast foreward 10 years and they have sagged enough to put the cap on much easier now,handily as I have blown a fork seal to fix.
They didn't have Laverda on the spring selector at the Racetec site till recently,only Maz forked Bevel Ducatis.
 
As Vince says there is a spring rate calculator on the Racetech site (http://www.racetech.com/index.aspx):

http://old.racetech.com/evalving/SpringRateCalculation/dirtspring.asp?brand=Laverda&yr=78-82&ml=Jota%201000&formuse=form1&SpringType=Fork&bikeid=400

Put in your weight, don't get confused by imperial and metric choices, see what answer you get.

I would be a little bit wary of universal calculations as there are always lots of individual considerations for a particular rider/bike combination, I guess this is why suspension specialists can make a living.

Cheers,

bazzee
 
Wow !! brilliant response, many thanks gents..
Gone through the spring calculator you kindly provided..
and will seek out some OE items..

regards

Dave..
 
Vince said:
I have the .9 spring in my 3C,it was to soft for me at my weight,120kg.It needed a stupid amount of preload to get the sag right,scary doing up the caps for fear of a  crossthread.Fast foreward 10 years and they have sagged enough to put the cap on much easier now,handily as I have blown a fork seal to fix.
They didn't have Laverda on the spring selector at the Racetec site till recently,only Maz forked Bevel Ducatis.
Click to expand...

Shit I must be fat? I'm running Racetech 1.0's

Oh but they're a bit too stiff though.

Root
 
Paul H said:
.... and RT 0.9kg/mm are too stiff, at least for me, I like a soft compliant ride. Rob, did you ever try the 0.8, or, are you still on 0.85? Would be interested in your findings if so.

P
Click to expand...

Hi Paul

I'm still on the 0.85 springs, I have a habit of not changing something if it :
a/ costs me lots of money
b/doesn't make me faster

I am adjusting to them with a lighter oil and think they will probably stay now. I might be jacking the rear end up a little which will steepen the forks, so that would affect the spring rating positively ?

Me and my bike only weigh 285/290 kgs now with full riding gear and a bit of fuel, so dont feel bad  :D
 
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