Youcan use conduit or pvc pipe. Then I used 30 weight fork oil. Yes, 30 weight! I can't remember now but I put in more than what the manual listed for the amount. Then I adjusted the shock preload to match the front. It made a world of difference but was still not enough dampening (pogo stick). On the 03 I used 20 weight oil and the stock
Buy2 quarts of 5W fork oil, you'll need just a little over 1 for the whole job. The RT page suggest 370ml in the outer fork tubes so a somewhat accurate measuring cup/ratio-rite is needed but ideally a graduated cylinder should be used as only a 5-10ml change will affect the progression rate in the last 1/3rd of the fork's travel. 2013Kawasaki KX450F Highlights: New Kayaba Pneumatic Spring Fork (PSF) replaces the main fork springs with compressed air to reduce weight, provide PostedMarch 8, 2012. the 08 oil level is 135mm from the top as I recall. remove springs, collapse fork, add oil. older bikes had oil at either 170 or 190 depending (slight change in about 96). What works the best on Gen one bikes is oil at 165-175. I stick with 10 wt (ATF). 5-15 psi air to trim.TheKayaba Air-Oil-Separate (AOS) fork has a new Diamond-Like Carbon (DLC) coating on the outer surface of the inner fork tubes offers a 15 percent reduction in stiction from ‘08 KX450F when the fork is exposed to lateral forces that would usually hamper slide action. The result is improved fork response, especially during cornering.
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