FZR400 Forks

[HellHound228]

Question what is their capacity? A fellow forum member is kind enough to sell me his but has to drain them to ship them. I don't want to overfill or underfill them. I dont want to ruin the forks that I'm getting from gogofizzypow and have to buy another set.

[apsolus]

well you cant damage the forks by overfilling them by alittle, to much thou and you can blow seals and stuff

[thatkid]

Check the manual for the exact specs but I believe it's with the spring in and the tube fully compressed you measure from the top of the leg to something around 3" down and that's where it should come to. That's for a 600 give or take. 400 should be the same.

[apsolus]

i just did my 1000 forks and it called for 14 ounces. and i wasnt really worried about being slightly off. they work like a charm i guess fork filling isnt a black art like everyone makes it out to be

[thatkid]

Some excellent reads on forks/suspension tuning

http://www.saltmine.org.uk/kgb/suspension.html

http://www.saltmine.org.uk/fzr/fork.html

I duno who that bloke is but he knows his stuff, scroll down

One of the sharp eyed workers at my mate's work shop , Tony, he of the welding skills fame, spotted that the magneto cover was not only scratched but cracked from the PO fall prior to its arrival by me....................

That undercoat was rubbed down to a perfect finish and i then sprayed it with "Rover Gunmetal" car paint which it turned out to be a darker silver than the Yamaha version of Silver on the bike. I must admit that if I had not JUST changed the oil I would have been tempted to do the Peanut cover and the Clutch cover to match and had a rather tasty two tone silver bike. But alas I was not about to do that so I went out and bought the "Peugeot Aluminium" car paint which is as close as Dammit to the Yamaha Version

I bought some and it is

According to this thread (FZR600) the springs should be removed. viewtopic.php?f=8&t=208

Hold the fork upright and with it fully compressed and no collar or spring installed fill it with fork oil to 3.98 inches from the top of the fork through the cap bolt opening. Be sure to fully extend and compress the fork a few times do distribute the oil. There are many different types of oil people have used. Automatic transmission fluid, engine oil, and different weights of fork oil have been used. Yamaha recommends 10 weight fork oil. It will take about 15 ounces per fork. Yamaha sells fork oil in 16 ounce cans. You will need two cans which costs about $12.

Mal.

[dobr24]

I just did my 400 forks and the oil level I used was 120mm from the top of the fork tube with no springs and fork fully compressed.

[Fzrmike33]

Just did my 400 forks, 120mm from top 4" 3/4, with no springs in them, and fully compressed, but if you have emulators leave them in. 1 quart of fork oil just does the job for both forks.

[pefrey]

What the two posts above mine said. 1 quart is enough and fill them each to 120mm (I did 110 mm in mine but this is not big difference) from the top while fully compressed, no springs or emulators.

[Fzrmike33]

Hmmm no emulators in ????????? i left mine in, the thread on how to do this doesnt really exsplain if your suppose to leave the emulators in ??????

[yamaha_george]

Hmmm no emulators in ????????? i left mine in, the thread on how to do this doesnt really exsplain if your suppose to leave the emulators in ??????

Suggest you read the links provided previously.

Now comes the tricky bit which is to put the inner tube down as far as it goes and set the oil height. Now i normally pour until I can see oil at about 1.5" below the top of the inner tube and use a vet's syringe with a piece of clear hose instead of a needle (mate's use a turkey baster (thanksgiving turkeys get a new baster I hope)) the length of the hose is cut to the required air gap {in this case 120mm} Push the plunger right down and insert into the oil and draw up the oil until you see continuous bubbles:-}

With the oil level set, drop in the PD valves with the screw heads upwards. They tend to sink somewhat slowly. You then insert your new spring slowly and place the original self centering washer on top of the spring. Pull up the inner tube gently.

I do try to make my explanations idiot proof as I often have to refer back to them and i do know what an idiot I can be :-}

[gibson1]

The manuel says 14oz

[yamaha_george]

I would remind the Brethren that fork oil level measurements are GUIDE LINES only not set in stone which is why several posts earlier there is a link to front suspension tuning.

This just so you get it right for you ! whether you be a little dude of 140lbs or a big guy at 340lbs