SOURCE: level of oil in front forks
not sure about newer models but the old models take 280 ml in each fork
SOURCE: how do i dismantle front forks to replace the oil seals
You just needed to.... remove front wheel, support bike on something, undo retaining bolts on forks, tap out fork legs from the top, using a soft mallet. Take out fork seals with a seal pick, (halfords) Replace old seal with new seals, in reverse order) sliding over the fork leg, tapping into place. Then put replace forks etc in reverse order (from dissassembly). Hope this helps
SOURCE: 99 CBR 900 Front fork seals
If the seal has been cracked by the cold weather it should be replaced. For someone mechanicly inclined and with the proper tools this is not a hard job. For the novice it can be one of those times you could have sent it to the shop and spent less time and money, and gotten better results....
As to a seal conditioner, the seals today are generally made of synthetic material. No "conditioner" will work. If the seal is made of rubber you have a 90% chance that a product called 'MARVEL MYSTERY OIL' will solve the problem. This prouduct was created in 1917 and marketed in 1923. Google the product name for more hystory and uses today. Basicly, the oil causes rubber to swell. This tightens seals and thus fixes the problem. Most any good auto parts store has this stuff on the shelf. By the way, if the bike was purchased new, wouldn't this be a warranty repair?
SOURCE: Need to change fork seals on xr400
http://www.carlsalter.com/motorcycle-manuals.asp
free pdf service manual here
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