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Dirt Bike Mods & Maintenance
Changing oil on 05 YZ125 Kayaba forks
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[QUOTE="osheen, post: 883315, member: 17476"] 1. I use Maxima 5wt.(85/150) I was a little thrown off by the "S1" spec too. 2. Yes, you have to take the fork completely apart. You really don't need to separate the inner & outer tubes though unless you are changing seals. You will need the special wrenches. The wrench areas are 8 sided, not 6 like a normal wrench so you pretty much have to buy the tools. It's hard to improvise anything else. 3. I know Race Tech and Pro Circus recommend adding the spacers. I made my own on a lathe at about 7mm in length. I put them on top of the spring like the manual shows. Race Tech's website says to put them on the bottom. (That's where to put them on the old stlye forks but with the new design they need to go on top.) 4. You are correct. They specify an amount but you just need to be sure that the oil level is above the step when pushing the base valve into cartridge. I think the more oil the better (because it will help to bleed more air out) but then it becomes real hard to compress the base valve into cartridge. After you get it together hold it upright and stroke it a few times just a couple inches. Next lay it on it's side with one hole facing up and finger over bottom hole, completely bottom out the damping rod and it will bleed the air out. When damping rod is fully extended it won't really want to top out. It kinda wants to pull back in a little and feels like there is a bit of air still in it if you pull on it. (which there probably is). That's as good as it gets, so I've been told. 5. Yes you have to use a volume measurement. There really isn't any way to measure height because the spring and cartridge get in the way. Also the oil level is really low because there isn't much in there compared to old fork. The outer oil only lubes the bushings and seals and takes up air space. Be sure that the fork is completely drained the best you can before filling again. Unless the forks are completely disassembled and reassembled dry, there will still be a few cc of oil trapped inside. They call for something like 245cc of oil. I wouldn't doubt that there is still 20cc of oil still in there unless you take it apart. I wouldn't worry about it too much, just be consistent in how you do it and you can alter the amount to suit your needs. 6. I don't have a whole lot of time on mine but I've been told the outer oil gets dirty a lot sooner than the inner oil. Myself, I plan on changing it about every 6-8 rides. I know some guys that go all year without ever changing it. I'd just keep an eye on it's condition over time and change it when your concious tells you to. I hope this all helps. Get yourself the tools and just go for it. Follow the manual. It all becomes a lot more clear when the parts are in your hands. One other thing, be prepared to make a big mess. You'll have oil all over the place. Way more messy than the old forks. [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Changing oil on 05 YZ125 Kayaba forks
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