fork oil
Well, I know for the 83-85 200x forks require 7 ounces standard. I always put a few more ounces in to make them stiffer. Some people dont recommend putting more than recommended in, but I havent had any problems. It does help to make it better though. I used a 10 weight Bel Ray Fork oil. If you have a heavier oil, I dont know what would happen. I would keep it standard if you have a heavier oil.
If your forks are 350x, I have no idea how much to put in. I dont think they are a lot bigger that 200x, but you better find out to be sure. Im sure someone on the site should know.
Hope I was of some help to you.
THE 80's RAGE! Currently owns:
81, 85 Yamaha Tri Moto 125
83 Yamaha Tri Moto 200 x2
82,83 Yamaha Tri Moto 175 project
85 Yamaha Tri Z 250
84 Kawasaki Tecate 250
84 Honda ATC 70
85 Honda ATC 350X
84 Honda ATC 250R
(2) 84 Honda ATC 200x
82, 83 Honda ATC 185s
81 ATC 200
Lots of other parts and bikes