Question about 1988 Ducati 851 Strada (Tricolore)

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Fork seals My son has an 1990 851 with Marzocchi forks. We replaced the fork seals a few months ago. He has put a hundred miles on the bike and blew out the right fork seal. this is the one with the rebound adjustment ( only on the right side). Question - What are the air valves for on the forks? What pressure should be put in? Why would the fork seals blow after a hundred miles? Is the pressure buildingup in the forks? Why only on the right side? Must have something to do with the rebound adjustment? This is not the first fork seals we have done. We have two race bikes and have never had this problem. We are not fimilar with these forks and would appreciate any help with this problem. The tubes are not scratched. We are not talking about a weeping seal we are talking about a puddle on the floor. Thanks

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ZERO air pressure on these forks those air valves are to get rid of any built up pressure in the tubes. I also have a 1990 851 love it! What weight of oil are you running and how much are you putting in?,,

Posted on Nov 10, 2008


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How do I change front fork seals on 1998 suzuki savage

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There are severall answers to this question (with videos) if you use a search engine for "rebuild marzocchi xc fork". You can get creative with the search terms.

As far as parts availability is concerned, scour the web (search engines again) or eBay.

Maybe hit the marzocchi site, register and ask them or search for documentation.

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If you know the year of the fork you can pull an owners manual from the Marzocchi website. They keep a running inventory of all their manuals in PDF, this will also help to diagnose the problem and let you know what you will need to overhaul.

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This is most likely not the answer you are looking for, but I would highly recommend taking these into a bike shop that has experience with the Marzocchi's. These are fairly complicated and require some speciality tools, and extremely easy to do damage that will be an expensive fix later.

First red flag is that the rebound screw does not move. A fork overhaul is probably in order, replace the seals and oil, check all the screws too make sure they are not stripped, adjust the air pressure, and so on. The bonus is a shop that can perform this overhaul, will also be happy to show you how to maintain the fork and how to adjust everything properly, and if you don't have a fork pump, sell you that as well. Trust me, these can be challenging without knowing exactly what you are doing, I am highly trained and I still have issues now and then with Suspension Forks.

I have included a video with a Marzocchi tech guy explaining a slightly newer version of your fork, Yours is basically the same.

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