Differences

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--- fork_seal_replacement [2008/10/11 18:28] – 75.111.219.156
+++ fork_seal_replacement [2020/10/19 11:50] (current) – external edit 127.0.0.1
@@ Line 118: / Line 118: @@
 Then slide on the dust cap and tap into place with hammer.
-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.
+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.
+===== Technical note by Y-G =====
+ ATF is about 10wt BUT whilst it is designed to resist foaming & high temperatures unless you are about 140lbs or less it is not "thick" enough to give much damping.
+Motor oil does not have enough anti-foaming agents in it and will allow the shocks to "fade" ie will absorb may be the first dozen or so highway joints but will allow the fork to "bottom" out & cause the bike to "jar" the riders arms & cause fatigue very quickly.
+Any good synthetic oil intended for fork oil use is fine , my personal favourite is Bel-Ray simply because I know I can mix oil wt's to get say 17.5wt rather than off the shelf 15wt or 20wt. Other makes are just as good my friends tell me but hey that is just me .
+=====  =====
+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.
 After filling to the proper height, fully extend the fork and insert the spring with the spring seat on the top, and then the collar, and then screw on the cap bolt. It will be had to get the cap bolt started but take your time.