firstime911
Member
Is the clutch fluid is mineral oil ?? I'm asking for the future modification..
Thank you
Thank you
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The R18 has a DRY clutch, which means that the clutch itself is much like most automotive clutches, i.e. the clutch is not wet & lubed with the oil that the transmission is bathed in. So it's called a dry clutch. Many clutches in Europen bikes (and most cars wherever they are made) have dry clutches. Most asian brands of motorcycles and modern Triumphs have "wet clutches" which are enclosed in the same part of the engine cases as the tramsmission, so they are "wet" with the same oil. With many motorcycles the clutch is OPERATED by a hydraulic system that uses a specific oil from the master cylinder [at the LH handlebar] to the slave cylinder [exterior to the engine case]. The typical tell-tale of a hydraulically operated clutch is the master cylinder and it's adjoining resevoir at the LH grip. At the far end of the system there will be a "slave cylinder" exterior of the engine case.This a very confusing thread, as previously mentioned the R18 single-plate dry clutch, no fluid. The op mentioned the clutch side reservoir which the MOM does not reference. The MOM does reference both front and rear brake use DOT4.
That is exactly why the question of what fluid to use is so important. In your case, you would like to upgrade the master cylinder, but the same issue with regard to the hydraulic fluid comes into play if a rider simply needs to top off or bleed-out the system.Reason is I want to upgrade the clutch master cylinder later to Brembo, RSD, etc.
Last time I did on my R ninet we have difficulty because All after market they use DOT4 fluid on Master cylinder clutch, but BMW using mineral oil. The oring inside Aftermarket's MC cylinder DOT4 is not happy with BMW Mineral oil.
So it seem BMW still using Mineral oil for their clutch cylinder. Very hard to find upgrade.