Bump stop

tom3c75 said:
The stop plate on Cbertozz?s bike looks like a Ceriani type plate that has had additional material welded to the stops.
Click to expand...

Exactly right Tom. It's a Ceriani-style plate modified to work with a Marzocchi lower triple clamp. But the modification dosn't appear to have been done particularly well. It looks as if the tags welded onto the stop plate only just make contact with the lugs on the Marzo triple clamp. I reckon the minimal contact area has likely chewed the edges of the alloy lugs away enough for the stop not to be effective.

Carlo. It's easily fixed by removing the stop plate from under the steering head and building up the stop tags in both height and thickness. Another job for your friendly welder.

You can work out how thick the lugs need to be by sticking a knob of plasticine on them. Squirt a bit of WD40 on the triple clamp so it won't stick to the plasticine, then turn the steering to where you want it to stop each side. It'll squish the plasticine to where the stops need to be. It may be different each side. You can work out how high the tags need to be by looking at the overlap (or lack of it) when they contact the triple clamp. You want the maximum area contact you can get. Once you have it figured out, take that info to your welder.
 
First off, the lock stop should be solidly mounted.

Yes, different items for Ceriani and Marzocchi forks, but both can be modded to work with the other.  Lav welding was never very pretty, so a lot of factory brackets look like they're home-made. :D

As long as they're not bent/mangled, the stock stops work quite well, no real need for any additions.  Usually just a matter of consulting the parts book to see what's needed to fit it as intended.

piet
 
Exhuming this thread rather than start a new one as a lot is still relevant.

Just wanted to confirm that the stop plate (yes I have bought a new ceriani type one) is hard mounted to the frame, from below the frame, with a thick washer between the plate and the frame? (I can just about see it one of the earlier pics here). The reason I ask is that the plate seems to sit to at slightly wrong angle when flat with bottom of steering head. Have checked my parts book and no diagram that I can see.

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I have found steering stop plates pretty poorly fitting, some needing a washer to sit square under the triple clamp. I just got a new one after my slipoff at Karlskoga last year and had to file the hole for the steering stem to prevent it working as a steering damper. It?s a Ceriani one, I drilled and tapped holes and screwed down alloy blocks to suit the Marzo clamps I use.
 
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