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Oberon Clutch Slave Cylinder

Started by Millietant, August 30, 2025, 02:10:19 PM

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Millietant

In preparation for my Scotland trip, I recently fitted an Oberon clutch slave cylinder to my FJ.

I'd been having to bleed air from the system every 1000 miles or so and the paint had started to peel off the oil filter cover again, so rather than just cleaning up the piston and bore and replacing the seals, I decided to splash out the £117 ($140) for the upgraded Oberon unit and I must say, i am heartily impressed.

It looked like a great quality unit, has given a slightly lighter feel at the lever and gearchanges, especially down the box, actually seem noticeably smoother.

All in all, it seems to have been a worthwhile upgrade.
Dean

'89 FJ 1200 3CV - owned from new.
'89 FJ 1200 3CV - no engine, tank, seat....parts bike for the future.
'88 FJ 1200 3CV - complete runner 2024 resto project
'88 FJ 1200 3CV - became a race bike, no longer with us.
'86 FJ 1200 1TX - sold to my boss to finance the '89 3CV I still own.

Waiex191

Dean,
That looks really good.  Although I note that they say it is not serviceable - must be returned to the UK if it needs work.  I had planned to buy a new slave from RPM the next time I need to redo my clutch.  Or even better, before the next time.
Bryan
1989 FJ1200
1981 Suzuki GN400
Poplar Grove, IL
 

Pat Conlon

1) Free Owners Manual download: https://tinyurl.com/fmsz7hk9
2) Don't store your FJ with E10 fuel https://tinyurl.com/3cjrfct5
3) Replace your old stock rubber brake lines.
4) Important items for the '84-87 FJ's:
Safety wire: https://tinyurl.com/99zp8ufh
Fuel line: https://tinyurl.com/bdff9bf3

Millietant

Quote from: Pat Conlon on August 30, 2025, 10:49:22 PMDean, don't throw away your old clutch slave.

https://fjowners.com/index.php?topic=12294.0

I won't Pat. I'm going to rebuild it anyway (as I have the kits and parts) and will likely donate it to another FJ owner at sone point, as I already have 2 spare rebuilt OE units on the shelf in the garage, from my previous spares donor bikes  :sarcastic:
Dean

'89 FJ 1200 3CV - owned from new.
'89 FJ 1200 3CV - no engine, tank, seat....parts bike for the future.
'88 FJ 1200 3CV - complete runner 2024 resto project
'88 FJ 1200 3CV - became a race bike, no longer with us.
'86 FJ 1200 1TX - sold to my boss to finance the '89 3CV I still own.

axiom-r

I too have recently fitted the Oberon Clutch Slave...  I could not be happier with the unit. In all my years of owning an FJ (from 1987 on) bleeding the clutch has always been such a pain in the ass. As you all know, there are whole threads dedicated to the tricks and methods use to try to purge all the air from the stock system.

I believe the seal design and bleed screw placement on the Oberon unit are superior to stock.

I was able to bleed the Oberon in minutes using regular methods and it has provided me with better lever feel and engagement than I have experienced in a long time with the stock set up.  My bike shifts better and I can find neutral more easily.

My conclusion is that I was not truly getting all the air out of the system so - not full lever engagement - despite thinking that the system was fully bled because no more air bubbles were appearing.

Highly recommend the Oberon
1992 FJ1200 w 2007 R1 Front & Rear
1989 FJ1200
1985 FJ1100

Waiex191

Are the materials better?  My stock slave cylinder has to be taken apart every couple of years and cleaned out.
Bryan
1989 FJ1200
1981 Suzuki GN400
Poplar Grove, IL
 

Waiex191

Bryan
1989 FJ1200
1981 Suzuki GN400
Poplar Grove, IL
 

Dads_FJ

Quote from: Waiex191 on August 31, 2025, 04:32:07 PMAre the materials better?  My stock slave cylinder has to be taken apart every couple of years and cleaned out.

You can read about them here:  https://iwt-customparts.com/en/product/clutch-slave-cylinder-black/

I fit a red one on my '89 a few years ago and have had no issues.  Actually he used my bike to promote his product on his website.
John S.

'84 Yamaha FJ1100
'89 Yamaha FJ1250 (XJR top-end)
'93 Yamaha TDM 850 (x2)
'06 Ducati ST3
'94 Yamaha WR250
'80 BMW R100S/Sidecar
'39 BSA WM20

T Legg

My clutch slave had a fair amount of corrosion when I put a rebuild kit in this spring. Now I have drips of brake fluid under my bike. I looked at the oberon slave . Since the oberon isn't rebuildable by the user I've decided to go with the oem unit while they are still available. I'm betting rebuild kits will be around for a long tume.

T Legg

FJmonkey

My last OEM slave unit lasted 20+ years, not a bad value.
The glass is not half full, it was engineered with a 2X safety factor.

'86 Ambulance - Bent frame, cracked case, due for an overhaul
'89 Stormy Blue - Suits my Dark Side

Waiex191

My original slave cylinder seemed crappy when the bike was new. I found I had to disassemble and clean it up every couple of years. I'm hoping the Oberon is an improvement. If it lasts 20+ years I'll call it a win.
Bryan
1989 FJ1200
1981 Suzuki GN400
Poplar Grove, IL
 

Millietant

My original had lasted over 100,000 miles and 36 years, but I'm happy with the Oberon one for now. Better "feel", lighter pull.
Dean

'89 FJ 1200 3CV - owned from new.
'89 FJ 1200 3CV - no engine, tank, seat....parts bike for the future.
'88 FJ 1200 3CV - complete runner 2024 resto project
'88 FJ 1200 3CV - became a race bike, no longer with us.
'86 FJ 1200 1TX - sold to my boss to finance the '89 3CV I still own.