billy sugger Posted July 9, 2022 Share Posted July 9, 2022 Hi knowledgeable people, I have a fork oil issue and I'm stumped as to which is correct. My Haynes manual states fork oil required as 457cc,+/-2.5cc, or a oil level check with spring removed and leg fully compressed at 149mm. My issue, I put in 71/2 60ml syringes full (7x6 =42) in the fork, but the level is showing 105mm, so higher up than stated level, so I'm confused. PS oil is Motul 10W medium Quote Link to comment Share on other sites More sharing options...
Mississippi Bullfrog Posted July 10, 2022 Share Posted July 10, 2022 Just checking, how did you drain the old oil, and you measure what came out? Unless you dismantled the forks you rarely get all of the old oil out. 2 Quote Link to comment Share on other sites More sharing options...
billy sugger Posted July 10, 2022 Author Share Posted July 10, 2022 Fork was completely dismantled and cleaned, it had been leaking quite badly so had lost some but did not measure what came out. All I can say is I used almost a litre bottle when I last changed them in 2020, then the bike sat unused for a year due to not being able to afford insurance. Now it's done I've lost the sag I had after front end braking. After diving the forks would rebound, only to drop maybe 2", now they don't Quote Link to comment Share on other sites More sharing options...
husoi Posted July 11, 2022 Share Posted July 11, 2022 Have you action the forks several times to remove all the air from the inner tube? 2 Quote Link to comment Share on other sites More sharing options...
billy sugger Posted July 11, 2022 Author Share Posted July 11, 2022 4 hours ago, husoi said: Have you action the forks several times to remove all the air from the inner tube? Yes mate, it's a new stantion so maybe the hole layout at the bottom is not exactly the same as the old one and is giving a false reading. Anyway I have put the correct amount in so have gone by that 1 Quote Link to comment Share on other sites More sharing options...
Stu Posted July 11, 2022 Share Posted July 11, 2022 I have always being told to forget the amount you put in but to concentrate on the air gap This was by a couple of specialists as I was having the same issue on an old bike Just ensure you have pumped the damping rod to bleed the air out and also move the stantion up and down too 2 Quote Link to comment Share on other sites More sharing options...
billy sugger Posted July 11, 2022 Author Share Posted July 11, 2022 Ha Ha, Stu, I gave it a damn good pumping, but it did not appear to make a difference. I haven't noticed any steering issues so I guess it was OK or has settled down once back together 1 Quote Link to comment Share on other sites More sharing options...
linuxrob Posted July 11, 2022 Share Posted July 11, 2022 Air gap is the best way, i use a syringe and a tube the right length down the fork and suck out oil till right level. 2 Quote Link to comment Share on other sites More sharing options...
Stu Posted July 11, 2022 Share Posted July 11, 2022 1 hour ago, linuxrob said: Love the fork tube holder 4 Quote Link to comment Share on other sites More sharing options...
jedibiker Posted July 19, 2022 Share Posted July 19, 2022 I always go to the level not the oil quantity. the air gap is the most important factor Quote Link to comment Share on other sites More sharing options...
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