Diameter of clutch m/c

[GregD-UK]

Hi all,

Just spent five days up bonny scotland on the falco. Had a cracking time till sunday, when I lost the ability to change gear using the lever Pressure on the lever was next to nothing. A month before I went, replaced the seals on my MPL slave, serviced bike, new oil, filters, and replaced all oil in both brake and clutch lines. My question is, does anyone know the diameter of our m/c? I know brembo don't sell service kits for them. Also, KTM waived the liability to brembo and you can get service kits for there's. Which if I know the diamter I can order off them, from my local dealer. Before anyone asks, I rang AP and they know Fook all about anything, as usual

Cheers in advance men

[Dalemac]

Hi all,

Just spent five days up bonny scotland on the falco. Had a cracking time till sunday, when I lost the ability to change gear using the lever Pressure on the lever was next to nothing. A month before I went, replaced the seals on my MPL slave, serviced bike, new oil, filters, and replaced all oil in both brake and clutch lines. My question is, does anyone know the diameter of our m/c? I know brembo don't sell service kits for them. Also, KTM waived the liability to brembo and you can get service kits for there's. Which if I know the diamter I can order off them, from my local dealer. Before anyone asks, I rang AP and they know Fook all about anything, as usual

Cheers in advance men

Yes, AP know nothing, at all, about anything Brembo. Strange that, isn't it.

Sorry, can't help with the MC as i have never taken one apart.

[fatboy]

Every type of seal has an identifying number which relates to its size, type ect.
If you can find this number, take the seal to a specialist and they will advise you as to its availability.
The number will be on the 'flat' side of the seal, eg., not the lipped side and hopefully the number is visible

PS I bought a seal kit for the standard clutch m/cyl from Kickstart M/cycles in Port Talbot a few years ago, off the shelf so try them if you get stuck

[KitchenSync]

Mr Greg sir,

I just asked the same question - THEN did the search!!!

What did you find out? Mine is wet and letting in air which eventually accumulates resulting in no clutch whatsoever.

[GregD-UK]

Hi all,

Ended up buying complete left hand brembo lever complete. After further looking at it, my braided line runs down the left side of the engine. Can only assume cause it has less oil in it, after a few warm miles, the latent heat off the engine may change the viscosity of the oil, resulting in loss of clutch feel/power

May re-sight or align my clutch cable away from engine, or, even sleeve it!

[KitchenSync]

I don't think the circuit is closed like that... with the cap off I can see the first 10-15mm of lever action squirts a little fluid into the reservoir before the seal passes the feed and pressurises the line in which case thermal expansion wouldn't be a thing (and the engine doesn't get fluid as hot as a caliper does anyway).

My problem is in that little jet of fluid coming up into the reservoir during it's initial travel there are always tiny bubbles - pump it a few times and I end up with froth in the reservoir.

I don't think it is the clutch slave (although I've bought and oberon anyway) as the lever end of the MC with a damaged boot is permanently wet.

[fatboy]

It sounds like the piston seals are so worn fluid is washing back rather than being forced forward and air is finding its way in from somewhere.
I got bored of trying to find a rebuild kit so got a second hand one from an 08 Tuono that fits a Y plate falco.
One thing I did notice is the thin wire clips on the low pressure feed hose can cause the res end of the hose to flare out and leak fluid out and air in,
I got some mikalor type clips, solid band rather than thin wire strand

[KitchenSync]

Having fitted my fancy schmancy Oberon slave last night it made no difference whatsoever so I took a punt and pulled out the MC piston through the shredded dust seal.

It's 12mm u cup piston seal - looking a LOT like these from this place in the US http://www.theoringstore.com/index.php? ... &cPath=371

The front seal was ruined - that's where the air was getting in, and the rear seal was doing all the work. Fortunately I had a surplus rear brake MC which is also 12mm and sure enough the seals were the same. Switched them over and hey presto... clutch action is better than ever and £90 spent on an Oberon I didn't need.

Now I've defunct seal to tout round I'll try and find what it is exactly and hopefully save fellow Apeists a few earth quids.

[randomsquid]

The front seal was ruined - that's where the air was getting in, and the rear seal was doing all the work. Fortunately I had a surplus rear brake MC which is also 12mm and sure enough the seals were the same. Switched them over and hey presto... clutch action is better than ever and £90 spent on an Oberon I didn't need.

Now I've defunct seal to tout round I'll try and find what it is exactly and hopefully save fellow Apeists a few earth quids.

That's a handy bit of info, my clutch is starting to play up and I have a spare rear MC in the shed, thanks.