too much fork oil
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Road Master
Joined: Sep 2008
Posts: 799
Likes: 8
From: central Il
too much fork oil
Changed my fork oil because I had a seep on the top nut because I didn't change the washer last year when I installed the race tech so I didn't know how much I lost, I put in 11.1 like the book says and on my ride it clunked real loud, like it was bottoming out but it responded good on the bounce while sitting still and handled nice, but when hitting a large bump or approach on a driveway sounded and felt like hell, well I drained it back out and noticed more came out than I put in, got about 12.1 a side so I didn't let it drain long enough. I thought I used SE heavy last year But I don't know for sure I didn't write it down, would that cause the severe bottoming out sound if its filled a ounce too much or do I need heaver oil. race tech says to use 15 w that they no longer have and SE heavy I thought was 15 but cant find out for sure what weight is is
Grand HDF Member
Joined: Jan 2012
Posts: 4,445
Likes: 2,823
From: Oklahoma
I had the same problem after my fork service, I sucked out a little at a time from the top and the false bottoming went away. If I read the manual correctly, the level it gives is for the fluid level before the springs are re-installed. Pretty useless for those of us just changing fluid. Going for as thorough a drain as possible and just replace the same amount that came out is the best way for the shade tree job.
Moderator
Joined: Oct 2012
Posts: 107,687
Likes: 20,116
From: Ft. Worth, TX
It is really simple to measure the fork oil height as in your service manual. Get one of these tools:
http://www.motorcycle-superstore.com...WT.MC_ID=10010
As you found out too much oil and you get hydraulic lock, too little and it bottoms out. Fork oil height is something that must be correct.
http://www.motorcycle-superstore.com...WT.MC_ID=10010
As you found out too much oil and you get hydraulic lock, too little and it bottoms out. Fork oil height is something that must be correct.
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