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


Have a 2006 suzuki s40 formerly known as the Savage 650 one cylinder. I ordered parts and tools to change front fork seals from Suzuki and its been 6 months they are on backorder. I decided to go another route since I need my bike running to and fro work. I went on ebay and bought good used forks from a parted out 06 that had really low miles. Put these on and all is great. The forks were $150.00 but that is not bad considering I did not have to buy fork oil, seals, tools for the job. Just had to put that on. Right now there is a set for a very reasonable price. Good thing about the s40's or savages plenty of good used parts to fix and they are easy to work on. I did it so anyone can. If you have any further questions on this Suzuki let me know.

Jun 25, 2012 | 1998 Suzuki LS 650 Savage

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Leaking fork seal? Try this...


When forks start leaking, a large part of the time there is actually a peice of debris in the seal, not an actual damaged seal. Here is a way to clean the seals while still installed on the bike. If this doesn't work, you'll know that your seal is indeed damaged and needs replaced. If it does work, you can put a little more gas in the tank!

WIth the forks on the bike, use a flat screw driver to pry out the forks dust seal. Slide the dust seal back a ways and clean it thoroughly. There will usually be alot of gunk in there to get out. Spray it out with carb cleaner and dry with a paper towel inside and out. Now clean the recess that contains your fork seal thoroughly with carb cleaner and paper towel.

There are a few things that can be used to clean the actual fork seal. You can buy a special made piece of plastic from mc parts catalogs, use a very thin feeler gauge, or my favorite is a piece of camera film negative.

Whatever you're using, very gently insert it about 1/2 inch between the seal and the fork tube. Be careful not to damage the seal. Now, holding your cleaning tool snug against the fork leg, slide it around the fork tube while slowly pulling out to make sure the debris is pulled out of the seal instead of pushed in. As you work around the fork, your little "tool" should be gently sweeping between the seal and the fork tube, removing peices of sand and dirt. You may do this a few times if they are really dirty. Wipe everything clean and very dry and work the forks up and down to see if you've stopped the leak. If so, wipe everything down one more time, reinstall your dust seal, and your through!

If you are working on upside down forks, make sure the area at the bottom of the fork tube (next to the casting) is clean. Often times simply bottoming the suspension out can cram dirt from this area into your seals.


*Help me out. Rate me!

on Jun 12, 2010 | Motorcycles

1 Answer

Keep having leaking fork seals.have replaced seals and oil after every ride lately.(4)have tried two brands of seals last time disasembled whole of forks cleaned every part,shims everything and had...


G'day. A couple of suggestions-
Damage to the fork slider-chips or dings.
Too much oil in the fork on re-assembly can cause the seal to go.
Worn or loose fork bushes will flog the seal prematurely.
When you transport the bike-if you don't use a seal saver can pop the seals.

So let me help with these.

Be sure that the fork slider is not scored,dinged or damaged on th surface.

A good double check of the oil quantity is to ensure that when you have re-filled the tube with oil & primed it(worked the air out of it), the oil level should be 100 to 110 mm from the top of the leg to the oil with the fork fully compressed. If the level is less than this-drop it to 100mm.

To check the fork bushes-try pull on the front forks front to back(wobble) & feel for looseness in the bushes.

And finally-When you transport the bike-put a chock(I use an empty 5ltr oil container-but you can buy propper chocks from the bike shop) in-between the forks at top of the front wheel .
Now when you pull the front end down it will stop on the chock & stop the front forks being under excessive compression for extended periods-so it saves the fork springs from sacking out too.
I hope this proves helpfull.
Kind regards Andrew Porrelli

May 20, 2011 | Sherco 5.1i Motorcycles

1 Answer

If feels like a pogo stick sometimes and also wants the front end to wash out too and on the front forks i have a oil leak


Your front fork seal are bad and need to be replaced.
When you loose fork oil, your loosing suspension dampening and only riding on the springs.(POGO)

Replace both front fork seals and dust caps, and put same amount of fork fluid in both forks.

I bought my seals and caps for $30 on ebay, and then took my forks off my bike and took them to a shop and they charged me $75 to do the job.

You can take them the whole bike and they will charge $100 - $150 including parts to do the job.

Dec 12, 2010 | Yamaha YZ 250 Motorcycles

1 Answer

Weaping fork seals.


a trace is normal, to much is not. that probable is due to dryed out fork seal, as they ere not getting lubed due to inactivity. the air fittings are for ajustable damping. if you ride 2 up or yourself being heavy or you just want a firmer fork suspension. i don;t know the range for your bike. try asking the dealer.or just put in 5 lbs. and try. if the presure doesn't last then you have leaky seals......

Jul 21, 2009 | 1983 Suzuki Gs 550 L

2 Answers

2004 honda shadow 600 VLX leaking fork seal bike has 600 miles on it should I replace left and right if only right is leaking.


check first to see if the leaking fork has any rust pitting on the chrome,if it has and its a very small blemish then fettle it off first,and just replace the leaking seal,as the saying goes..if it aint broke dont fix it,if the seals had been in the forks for years and the bike not used then consider replacing both..

Jun 05, 2009 | 1986 Honda VT 1100 C

1 Answer

How do i dismantle front forks to replace the oil seals


You just needed to.... remove front wheel, support bike on something, undo retaining bolts on forks, tap out fork legs from the top, using a soft mallet. Take out fork seals with a seal pick, (halfords) Replace old seal with new seals, in reverse order) sliding over the fork leg, tapping into place. Then put replace forks etc in reverse order (from dissassembly). Hope this helps

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1 Answer

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