FZRSupport: the FZROnline Archive

While I’m having problems with my electrical system I’ve decided to change out my fork oil. I’m looking for the fastest and easiest way. I was reading on lawrance’s FZR page, and read up on his fork oil change. I noticed he sucked the oil out with a shop vac. Why? Isn’t this what the fork drain screw is for?
Am I going to blow out a fork seal with 30w oil?

30w would be way to heavy. 10w is stock, and I put in 15w.

I took my forks legs off the the bike because I also changed the springs and my forks don't have the drain plugs on the bottom. You can change the oil by sucking it out and using the drain plugs if you have them so there would be no need to take forks off unless you are changing a seal or something else.

10w is stock and the springs are less than adequate either way to be honest. 30w is fine and won't blow the seals. That's what I was running in the forks on the 92 FZR 600 I used own. Another member owns it now and unless he's changed it out that's what is still in there.

You can run either oil but would be safer to use what is recommended per service manual.

sweekster wrote:30w is fine and won't blow the seals. .

Really? I would never have thunk it.

slayermd wrote:

sweekster wrote:30w is fine and won't blow the seals. .

Really? I would never have thunk it.

Yep. Rode the bike like that for almost 2 years with no issues before I sold it. Felt pretty stable too. I wouldn't go any higher than 30w though. You as well upgrade to more stout springs at that point.

I got 20w its all they had. only took me about an hour or so.
when I got the tops off and looked down in the tubes they where only about half full, taking a closer look the fork seals looked pretty new, so Im thinking they didnt fill them up all the way, and the oil looked pretty clean. ( dont see any leaks)

this is a 100% sock at how stiff it made it, Im kinda glade they didnt have the 30w. I strongly suggest any body with a spungy front end to do your fork oil, I should have dont it a long time ago.

bucket wrote:I got 20w its all they had. only took me about an hour or so.
when I got the tops off and looked down in the tubes they where only about half full, taking a closer look the fork seals looked pretty new, so Im thinking they didnt fill them up all the way, and the oil looked pretty clean. ( dont see any leaks)

this is a 100% sock at how stiff it made it, Im kinda glade they didnt have the 30w. I strongly suggest any body with a spungy front end to do your fork oil, I should have dont it a long time ago.

You didn't FILL THEM ALL THE WAY UP did you??

With the fork legs extended they will only be about 1/2 way full.

If you need 20 or 30wt oil you need to do something about the damping..either get emulators or weld up and re-drill the damping rods with smaller holes.

I did what this guy did.its in maintenace tords the bottom.
http://roundaboutscooters.com/fzr/

left about 4 in. at the top.

bucket wrote:I did what this guy did.its in maintenace tords the bottom.
http://roundaboutscooters.com/fzr/

left about 4 in. at the top.

Gotcha. Cool. I was gonna say, when the airspace gets used up by fork travel, the seals go 'bloooeey!'

To start with none would get you hydraulic locked forks with the first good bump blowing the seals right in your face