bleeding clutch fj1200

[skikman]

hi all.lost all pressure on clutch and was getting bubbles in master cylinder.it was suggested that it was more than likely the slave seals so i replaced them.with the master cleaned and empty i tried to back bleed from nipple with syringe.i could only push so much in then it would start seeping out off nipple threads[pushing hard].no fluid in master.i tried then the filling master and pumping,releasing nipple and so on[no pressure]then i tried sucking out through nipple.was just getting air and fluid[none from master] when i pump master now im not getting bubbles.im confused. yamaha fj1200

[Pete.]

Sounds like the master cylinder reservoir return port might be blocked. Could be just a knackered master cylinder. I'd forget the slave seals and overhaul the master. Faulty slave seals would probably leak oil a the caliper.
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a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good

[davebike]

The FJ clutch is hard you may be able to get it sorted by bleeding the master cylinder first
Remove the hose connection Put lot cloth and plastic bags under the connection put your thumb or finger over the hole in the master cylinder ware a rubber glove if got assertiveness skin
Work the leaver slowly until l fluid comes out around you finger
Refit the hose and try again

In the trade I use a vacuum system to pull fluid though or a low pressure 4/8psi power system to push it either will do this in moments
____________________
Dave
NC750Xdct + others at work !
davebike1@gmail.com

[skikman]

[Fizzer Thou]

I replaced the slave cylinder seals because the outer seal had distorted from exposure to the chain lube flung at it.

https://i666.photobucket.com/albums/vv23/WiNot_Rhencullen/Workshop/Picture069.jpg
https://i666.photobucket.com/albums/vv23/WiNot_Rhencullen/Workshop/Picture072.jpg

At the same time I stripped and cleaned the master cylinder,just to be on the safe side.If the outer seal of the piston arrangement is sound,then there should be little or no corrosion or scoring of the bore.Some say use a hone to clean up the bore,but if it is clean then just replace the seals as a kit.Try and use a genuine kit from Yamaha,as they do not cost much and the quality is assured,as against some pattern parts from chinkyland.Make sure that the push rod is clean and straight by rolling it on a sheet of glass or window.Clean any corrosion off with emery cloth and use fresh engine oil when you reinstall it,not grease.

If you wanted to ascertain if it is the master cylinder or not that is causing the problem,use the front brake master cylinder.It will only cost a few crush washers,which,if they are copper,can be reannealed and reused.

I use a master cylinder from a ZXR750R on my Exup,together with a braided steel hose,which helps to make the uprated clutch very light.

https://i666.photobucket.com/albums/vv23/WiNot_Rhencullen/Workshop/Picture028.jpg
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Just talk bikes.What else is there?

Always have a 'Plan B'

[temeluchus]

Bleed the system with the slave cylinder unbolted from the engine and the slave piston clamped with a g clamp. Far quicker and easier than trying to bleed it with the slave in situ.
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Some shite cruiser. Now with guns and FREEDOM!

[Fizzer Thou]

I cannot say that I have ever had a problem bleeding my clutch,even when the new clutch hose was installed.If anything it is easier than bleeding the front brakes
____________________
Just talk bikes.What else is there?

Always have a 'Plan B'

[temeluchus]

[temeluchus]

Actually could your clutch line have melted or rusted through? Have you pulled the line out to check?

This happened on one of my bikes yonks ago.
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Some shite cruiser. Now with guns and FREEDOM!