I personaly would never run a small master cylinder and reservoir like fitted to the CRF and CR on a road/track bike. Ive seen it before when the the fluid expands and locks the brakes on. The bigger the reservoir the better, ever seen a GP bike with a small front brake reservoir? There is a reason.

I know we are talking about the rear here but even the HRC bit of green tubes holds more fluid and air than the little stuff fitted on the MX bikes these days. Its even more important for people like myself and Andy who are rear brake abusers

lol ps its not a dig at you RC46, just something ive seen before
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If I have to take the carbs off once more...