So the only clutch master cylinders I like the look of are Ducati ones. These match the brake master cylinder I have, although that’s from a Cagiva Mito, not a Ducati. However, Ducati Clutch MCs with remote reservoirs are at least £60, so I thought I’d take the opportunity to set up a remote cable operated master cylinder instead, as it’s something I’ve wanted to try, and gives the cleanest possible handlebar without doing something stupid like a foot clutch (never!).
This one is from a scooter, to operate the front brake. Ducati dry clutches are heavy (if you run all 6 springs, my current bike runs four and doesn’t slip) and they are particular to master cylinder bore size. There’s a fine line between the clutch being super heavy, and not disengaging properly. Older Ducati MCs were a 13mm bore, and very heavy. Newer ones are 12mm and lighter. My current bike has a 1/2 inch (12.4mm) MC off a different make and it is light enough with only four of the six clutch springs but not amazingly light. I’d not like to get caught in heavy traffic with all six springs on there. Anyway, the bore size of this MC seems to be 11.5mm, which might be straying into too small territory, with clutch disengagement issues. Probably when it’s good and hot. We’ll see.
If these master cylinders work then great, they’re cheap and plentiful. The only other ones like this I could find were from 80’s BMW R models (expensive) or early Kawasaki Z900s or Z1s (unobtanium, or very at best very expensive).