Ceriani Fork Yokes for a Triple

pf1

pf1

Hero member
Location
Portsmouth UK
I've just bought a set of Ceriani forks and dimensionally they seem to be correct but much to my surprise the stanchions and steering stem are parallel. The yokes aren't Marzocchi as far as I can see but the top yoke is flat with raised mounts for the bars. Does anybody have any idea what I have got? Did Laverda supply triples with this set up at any time?
 
Don't think they are SFC, no orange paint anywhere. The guy I bought them off posted some pictures on here a while ago, Phil Todd reckoned they were late gold Jota fitment but I thought they also had the offset.

Early Ceriani forks for Jota

Hi All, I've got a nice used set of Ceriani forks for sale. These are the early ones with the brake mounts on the outside. These forks are in good used condition one fork stanchion could do with replacing but could also be cleaned up. Happy to refurbish them at cost. I'm looking for a...
laverdaforum.com laverdaforum.com
 
If they're those in the pic, not SFC probably.
Orange is only paint. I inherited a set of SFC clamps last summer without knowing what they were. No orange paint.
Nowdays, 80% of Laverdas are orange.

Paul
 
Pat
They are the flat Ceriani yokes as fitted for a short period to 78' Jota's before the changeover to Marzocchis. Also known as flat Ducati yokes. I have these yokes fitted to three of my triples. They make the bike handle far better than the usual standard Ceriani yokes..
Alan.
 
It's true that the non-parallel TCs give more trail - but the consensus seems to be that they feel 'weird' compared to the parallel type. That's probably due to the unusual geometry 'arc' they produce when the bars are rotated.

I tend to agree and personally prefer the parallel universe.
 
Yes and that was the bike that Dave Msomeone did 240kph on when testing it stability would help that that speed on public roads
 
Take it you're talking about Cerriani 38's and not 35's forks. Either way there's a lot of valve dampeners and progressive springs which I recommend.

Factory Cerriani fork valves and springs are rather HARSH as they will deplete your tires and tax your durability to the limit ;o)
 
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helicopterjim said:
Apparently that would be the exact opposite. The SFC triple clamps gave less trail ergo less stability but quicker steering.

The non-parallel triple clamps as used on the triples increased trail ergo they added stability.

Jim
Click to expand...

That's the conventional wisdom, but it's not necessarily true. Any motorcycle frame will have a sweet spot where the optimum trail should be. If you go too far either way it can get unstable.

Too much trail can actually decrease stability because it over-compensates for any steering disturbances. It's what's known in the engineering world as a positive feedback loop with excessive gain.

If the front wheel is kicked off-line by a bump in the road, excessive trail can flick it back too much, so it goes over-centre and the trail chucks it back the other way, so you end up with an oscillation. The oscillation frequency will vary with road speed. If it's close to the resonant frequency of the system, it can turn into a tank-slapper.

en.wikipedia.org

Positive feedback - Wikipedia

en.wikipedia.org en.wikipedia.org
 
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