UK Monster Owners Club Forum » .: Technical :. » Engines, Clutch, Gears » Hydraulic Clutch Fluid Issue

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Old 30-04-2020, 02:59 PM   #1
Ron1000
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Hydraulic Clutch Fluid Issue

Anybody any had issues with losing clutch fluid?

My reservoir seems to be losing fluid at a very slow rate. No drips or that on the ground I'm wondering if it's leaking into the engine somehow? or maybe leaking round the cap?

Weird one.

Any advice is appreciated.

Thanks guys
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Old 30-04-2020, 03:05 PM   #2
350TSS
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Sounds like the slave leaking into the area close to the drive sprocket. If you wet lube your chain then the fluid would get"lost" with the general crud around there.
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Old 30-04-2020, 03:07 PM   #3
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Whats the fix for that? new seal?
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Old 30-04-2020, 03:07 PM   #4
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I'm talking tiny amounts. It's been topped up twice in 15 months
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Old 30-04-2020, 03:23 PM   #5
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I’ve also had a high mileage (75k+) master cylinder seal fail, i could see a very faint splatter on the left side of the tank.
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Old 30-04-2020, 03:46 PM   #6
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I had it on my Evo, I lost almost a reservoir full on a 300 mile day trip. I didn't notice til I got home, cleaned the bike and took the reservoir socks off and thought oh poo. I swapped the clutch slave to an Oberon but not really ridden it since due to the current climate so can't report much. The clutch slave looked pretty pants but didn't investigate just binned it
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Old 30-04-2020, 03:53 PM   #7
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Quote:
Originally Posted by 350TSS View Post
Sounds like the slave leaking into the area close to the drive sprocket. If you wet lube your chain then the fluid would get"lost" with the general crud around there.
Agreed I had this on my 916, leaked fluid was 'lost' in the chain lube/crud.

I replaced it with an aftermarket slave that reduced the pull and is still working fine 20 years later but you could probably just replace the seal to fix it.
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Old 30-04-2020, 03:53 PM   #8
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Clutch slave easy to change?
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Old 30-04-2020, 03:56 PM   #9
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Whats the fix for that? new seal?
I don't think the oem slave is servicable although I suppose if you found a suitable driver to engage with the big star, you could open it up. But then you'd have to source precisely the right o-ring to fit the cylinder (as it's not listed as a Ducati spare part).

Better, I think, use it as an excuse to upgrade to an Oberon or similar.
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Old 30-04-2020, 03:58 PM   #10
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Clutch slave easy to change?
Very easy. 20 minutes including bleeding wouldn't be unrealistic.
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Old 30-04-2020, 04:02 PM   #11
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Yeah took me longer to turn the bike around than do the job with all the chains and locks to take off
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Old 30-04-2020, 04:03 PM   #12
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Slave is easy to swap out just remember the hidden bolt under the sprocket cover usually covered in chain lube goop.
You could remove the clutch slave clean up and leave it outside the bike to see if there is a leak.
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Old 30-04-2020, 04:17 PM   #13
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Slave is easy to swap out just remember the hidden bolt under the sprocket cover usually covered in chain lube goop.
Not a problem for the Evo as it's just the three external screws that hold the slave in place. If I remember correctly, you won't even need to remove the sprocket cover.
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Old 30-04-2020, 04:17 PM   #14
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Quote:
Originally Posted by rollo22 View Post
Slave is easy to swap out just remember the hidden bolt under the sprocket cover usually covered in chain lube goop.
You could remove the clutch slave clean up and leave it outside the bike to see if there is a leak.
I’ll do this tonight and see how it goes over the next two / three days. I’ll get back with an update.

Thanks again guys. Top forum, top knowledge.
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Old 30-04-2020, 04:24 PM   #15
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You might find this helpful, Ron. And be careful not to lose the anti-rotation pin from the pushrod when you remove the cylinder.



Don't forget to use new copper crush washers if you've disconnected the banjo.
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