Bleeding clutch!!!!

[Nigkat]

Having problems getting the clutch on my project working.

It's a mk 2 bandit 12 and I'm using a kwak zzr 1400 radial master cylinder. It's marked as 3/4. Is this big enough as I get very little movement on the clutch actuation pin less than 10mm.

Been bleeding it with no bubbles, pushed the cylinder back and it doesn't seem to get any better just enough to turn the wheel whilst it's in gear with clutch pulled in but with a lot of drag.

Engine been stood for quite a while so could the plates be sticking causing the drag?

Getting pretty fed up just pumping fluid through.

[banoffee]

Daft question but is the rod long enough / corrosion free so it moves ok?

[Dezza]

3/4 inch is 19mm, which is massive for a clutch m/c. Maybe check up to confirm on the size If the engine has been stood the clutch plates may have stuck together with old oil so I think you have answered your own question as to where to go first!

[Oilyspanner]

As Dezza says, that's a big m.c., standard's a 14mm I think, shouldn't make much odds though. Check the  slave cylinder, could be corroded or have a leaky seal.

[johnr]

if the slave cylinder seal is goosed, its as likely to pull air in as it is to push fluid out, so you could sit all day bleeding it and never get it clear.

[Captain Chaos]

17 hours ago, Nigkat said:

just enough to turn the wheel whilst it's in gear with clutch pulled in but with a lot of drag.

seems normal to me

[Nigkat]

Thanks, yeah the slave cylinder has a new seal, so all good there.

Good to know that the master cylinder is up to the job.

I moved the cover over 5mm to clear offset sprocket and made up a new rod 5mm longer so free and clean.

Looking like it's ok then.

Probably get it all running, need to sort carbs out first and see if it frees up.

Cheers .

[mikeyd]

Had the EXACT same problem on the same master, and I had to dissasemble the master cylinder and clean it.  Found a sort of jelly around the piston from sitting also the fluid return hole is very small and that needs special attention. After that - problem gone! Great master to use for racing by the way, clutch action is like butter.

[Nigkat]

On 1/9/2020 at 6:41 PM, mikeyd said:

Had the EXACT same problem on the same master, and I had to dissasemble the master cylinder and clean it.  Found a sort of jelly around the piston from sitting also the fluid return hole is very small and that needs special attention. After that - problem gone! Great master to use for racing by the way, clutch action is like butter.

Cheers, good to hear.

I've bought a master cylinder repair kit, so should sort it.