Author Topic: clutch slave cylinder  (Read 2357 times)

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Offline VinceS

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Re: clutch slave cylinder
« Reply #2 on: 24 Feb 2010, 10:38 PM »
You have checked the Fraser's spares pricing / availability? Otherwise there are heaps of aftermarket ones around. Whatever you do you want to get one with the extended shroud and small double seal, and absolutely don't get the bellows type. These things are exposed to all the crap and solids flying around the chain, and they go in and out with this mix of grinding paste stuck to them - and the slave cylinder needs to be designed to deal with it. It didn't seem too important to the Italians for quite a while to deal with this properly, they didn't seem to see a problem with getting 15 - 20k out of a slave cylinder. The later designs have improved a lot 'though.

I don't know what was fitted to a 748 in terms of design quality, but have recently lived through an experience where the OEM replacement on a monster was not to any new design, because it seems they thought keeping the D symbol on it per original was more important than providing a later design that works (off say an ST). Fortunately the slave cylinders all seem to be basically the same except for outlet design mentioned, plus the better designed ones have a push rod that is about 1cm longer. However I know people with the short push rod just put a couple of ball bearings in the newer type slave cyl first and apparently this works fine (haven't tried it myself).

Aftermarket ones tend to be 5mm larger id which reduces clutch lever effort by 25%. However this is at the expense of 25% less travel and, whilst the reduced effort is very welcome, that CAN be a problem with engaging neutral. If you get rid of the spring plate (typically in the middle of the clutch pack) and replace it with a standard steel plate (about $12) this should solve that aspect if you need to as it shortens the take-up length to the point that the clutch will release properly when pulled in a bit less. Otherwise if you still have the problem you will need to check for flatness of all the clutch plates and make sure you have a flat set, or put up with a bit of hassle getting neutral which is not so hard to live with really.

Frasers will sell you the aftermarket STM slave cyl also you could enquire about. There are a few other sources and here are some links I have lying around with no particular purpose other than to inform: or

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Offline 748 mick

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clutch slave cylinder
« Reply #1 on: 23 Feb 2010, 07:53 PM »
hi there , chasing a new slave cylinder for a 748,can Any one help with this , thanks mick ;D


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