Sounds like your front wheel is out of balance.
Seriously i can't work out the logic in using ATF-F in front forks.It's great in certain bike clutch's,but front forks need the slipperiest lube you can buy.It's all about reducing friction on seals and bushes.Using an oil with high friction will only create bounce by resisting movement until a point is reached,and this energy will release all of a sudden.Hard on the wrists.My bet is this is the cause.
I had the same problem early on...With 200ml the level was too low.I cured both by putting in 240 - 250 ml.
Seriously i can't work out the logic in using ATF-F in front forks.It's great in certain bike clutch's,but front forks need the slipperiest lube you can buy. My bet is this is the cause.
ATF is the snake oil of choice for bikers.
That is very interesting. I was under the impression 200mm was tip top tight but I didn't check. OK... very good to know.OK. Well this is a VERY easy thing for me to try. I did just put the ATF in this Spring so you may be on to something. It seemed like guy have been using ATF in their forks forever so I figured "old bike design - old bike logic," but maybe that's not serving me best in this case. I've heard people use 5w, 10w, and 15w fork oil so maybe I'll start in the middle at 10.Haha. Awesome.Ok... thanks guys. Good stuff. Appreciate the info.Boggy:I only offer the 240ml trick because that's what I found on my bike. I have been around long enough to not be surprised when I find that components don't match up with manufacturing runs. A 1/4" dowel from Ace Hardware is an inexpensive checking tool.Good luck.PaulBoggy