![]() When removing the backing plate, I immediately noticed a sliver of aluminum such as is found in machining or cross-threading a threaded connection. Oberon’s instructions state that if this hole is “exhausting fluid.this is normal as the unit needs to breathe when the piston moves back & forth.” However, I noticed that this hole was seeping oil at a noticeable rate even when NO clutch pressure (lever or pressing the unit) was active - see first photo.ġ1) realizing this constant weeping of oil was a probable concern, I reluctantly dismantled the Oberon slave cylinder further. ![]() Same result.ġ0) On the Adv Riders forum, many users seemed concerned about oil seeping from the small hole on the Oberon slave interior plate. Meanwhile, having a life & job to attend to, I once again refilled the reservoir & wrapped paper towel to let the bike sit overnight. This seems to eliminate any leaking from the banjo bolt/hose area. The next morning the reservoir was almost dry, the towelling under the slave was saturated with oil while the towel around the banjo bolt & clutch hose were dry. A couple of lever pumps & left the bike overnight. I put clean paper towel around the banjo bolt area & under the slave. I refilled the reservoir but left the cover off. NOTE: when cracking the bleed nipple I noticed the released oil would be almost frothy, indicating many tiny air bubbles).ĩ) I checked the master reservoir & it was again lower with some oil under the slave. I got less than 200 m from home before drop in clutch pressure forced an immediate U turn. Again I refilled, bled the clutch & achieved great pressure with no obvious leaks so another test ride after driveway trial. At that time I noticed significant mineral oil dripping from the bottom of the slave unit but couldn’t determine its exact source.Ĩ) once home I reread & rewatched all the Oberon install instructions & checked online forums for clues (especially Adv Riders Forum). ![]() Fortunately I had brought mineral oil & tools so after much effort, I was able to pump up enough pressure to limp home. This did expel air bubbles & some oil & I repeated the process until I had firm clutch pressure & no more air bubbles from the nipple.ĥ) I would still notice small air bubbles rising to the top of the reservoir when pumping the lever but hoped that would be a minor issue.Ħ) after checking the connections & running through the the clutch while stationary I took the bike for a test ride.ħ) I got less than 2 km from my home before I had no effective clutch pressure that would disengage the gears so I made an emergency stop in a parking lot. Once this seemed free of air, I reinstalled the banjo bolt using the new Oberon crush washers until they were slightly deformed & the nut was definitely snug.Ĥ) I then bled the clutch line by topping up the master reservoir with oil, pumping the clutch lever 6-8 times, held the lever in, then quickly released & retightened the breathing nipple on the banjo bolt. “did you put in the ball bearing?”)ġ) after removing & cleaning the slave cylinder mounting location, I inserted the ball bearing in its tube & began to install the new Oberon unit.Ģ) I did not operate the slave cylinder at any point until it was mounted & almost snug on the mounting plate using the new Oberon bolts with about 1-2mm of play.ģ) as per Oberon & other video suggestions, I added small amounts of mineral oil & pumped the unit lightly to pre-fill the cylinder with oil & expel air. Hopefully it forestalls pointless comments i.e. I proceeded as follows: (this is the text of the very detailed email I sent to the retailer, Triple Clamp, & Oberon. Installing the billet/mounting plate & new slave cylinder was straightforward. I decided this spring I’d commit to a better fix so I researched & ordered the Oberon slave cylinder & their backing plate.Īfter reading over the Oberon directions & watching a couple YouTube install videos a couple times each, I did the swap. All they did was refill & bleed the clutch, so it failed by the time I got to a friend’s place for a visit 550 km from home. Never got it to stop leaking and asked Blackfoot Motorsports (Calgary AB) to “fix the clutch leaking issues” last summer when I had an oil change & major tune up. I had replaced my original Magura slave cylinder that had worked just fine for about 60,000 km with a slightly used Magura. I received my Oberon clutch slave cylinder & mounting plate last week (shipped 2021 Apr 19) & looked forward to fixing the nagging failing clutch pressure issues I’ve had since last summer on my ‘07 KTM 990 Adventure. Sometimes the Magic works, and sometimes it does not.
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