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April 30th, 2017, 02:19 PM   #1
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Fs570 clutch losing pressure

Hi all, my first post on here, I've just picked up a fs570 2011. First ride out today and the clutch seems to keep losing pressure can pump it back up by cycling the lever a good few times but then it loses pressure again. Can anyone help, hoping it's a simple fix, where should I start,

thanks in advance


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April 30th, 2017, 04:08 PM   #2
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Some slave cylinder can leak. My FE570 does. sounds like maybe yours is one of then. Bleed it with oil mineral and keep an eye on it. I have to check It every 6 months. Or you replace the slave cylinder.
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May 1st, 2017, 12:39 AM   #3
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Thanks rainerioI will check today and have a look today as I haven't touched anything yet I'll top it up any bleed it see if I get any improvement

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May 1st, 2017, 10:59 AM   #4
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You need to replace the o ring that seals slave piston. Happened to me. Think that engine heat caused it. This motor produces lots of heat. Intake boot also may start cracking due to heat.
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May 1st, 2017, 02:45 PM   #5
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Fe390vt Can I get the part number from You for that O-ring
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May 1st, 2017, 03:18 PM   #6
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Thanks fe390vt I will order some and let you know how I get on

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May 2nd, 2017, 01:00 AM   #7
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Piston seal i should have said, as there is also an o ring that seats the slave cylinder to motor. Think it may be the same seal as brake piston as I believe i used a spare from brake. Dont have part no. Kind off a pain to get the new seal in if i remember correctly. You may want to buy a couple spares in case it rips.
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May 5th, 2017, 02:23 PM   #8
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I took off the master cylinder cap, the level was low in there, so I went and bought some mineral oil, topped it up and it has been fine ever since, I gave Midwest a call and explained to them what had happened and they said just closely monitor the level in the MC. im not sure whether to order the piston seal or a new slave
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May 5th, 2017, 02:40 PM   #9
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+ 1 on the slave cyl. O rings. Not hard to replace. Sorry, don't have a PN, I bought 5 from someone who bought 100. If it starts leaking again (I think it will) and you can't find a replacement send me a message.
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May 5th, 2017, 03:44 PM   #10
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How about size of O-ring. You know something like 60mm OD x 2mm thick it has to made by someone. Thanks and I have to fill it about every 6 months and it's going to take a crap some day and have to replace it.

Last edited by Rainerio; May 5th, 2017 at 03:46 PM.
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