fork seals/oil

After riding this past weekend i decided its time to change my fork seals. Ive cleaned them a few times with a fealer guage but now they leak every ride. My question is, how hard is it to change the seals? do i need any special tools? also what kind of fork oil should i use, and where/how much should i add to it. Thanks for your help

You are asking questions that are in the factory service manual. Do you have it?

If you don't, you really DO need it to change the seals properly.

My advice is to get the factory manual, read up on the seal change, then do a search here on TT. There are several very good write ups on it -including motoman393's description of installation of race tech equipment. He has a nice description of what tools are required. The link is

The things you need are - 14mm hex socket to remove the base valve, a cartridge holder, and a seal driver. You can get the 14mm hex from a Napa , the cartridge holder and seal driver from Scotts (or you can make them - see motoman's web site).

[ April 21, 2002: Message edited by: skthom2320 ]

[ April 21, 2002: Message edited by: skthom2320 ]

thanks for the input. I ordered the manual tonight, hopefully it will be here soon, this is the first major thing that ive had to do on this bike so far, and i dont want to mess is up just tearing in to it, after looking at all the tips i think i can do it fairly easily as long as i take my time. thanks again

Check you PMs.

You don't have to remove the base valve to replace your fork seals!

It's very simple: Take the forks off the bike. Use a 19 mm wrench to remove the cap bolt. Use a thin 17 mm wrench to remove the assembly that holds the spring in. Remove the spring and drain the oil out. Now flip the forks upside down and remove the snap ring with a little flat-bladed screwdriver. It should come out easily. Now pull the forks apart. They come apart easily, too. You should replace the oil seal, front fork piston and slide metal on each fork. The piston and slide metal are teflon-coated and that coating sometimes wears off. You might find that you don't need them, but if you do need them, you'll probably have to order them and then wait to put the forks back together. I'd rather have them and not need them than need them and not have them. All 3 parts (seal, piston, metal) should cost you about $30 for each side. Put it all back together in reverse order. I don't have a fork seal driver, so I just use a big, fat, flat bladed screwdriver. (That's certainly not the best method, but it worked.)

I use Bel-Ray 10 weight fork oil. Don't know if that's the best--I think they come stock with 5 weight oil.

I didn't answer your question about oil. You should have found a ton of advice in your search, but I used Enzo's KYB 01 oil with my stock boingers - much cheaper than the Yamaha 01!

I had my suspension done since then and now use Motorex 7.5 wt.

Regarding removal of the base valve, you might not have to remove it to replace the seals, but you should remove it so that it can be cleaned properly.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now