Apparently the recommended
grease is good for 10'000 miles, I don't know why we are not
told this when we buy the clutch. Thanks
to Stuart for the information.
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1000 miles with Castrol recommended (Tribol) grease
It's 1000 miles and the clutch is back off the
bike, the first thing that I noticed after taking the
plates off was quite a bit of sideways movement or
bearing float to the clutch centre. When the clutch
centre was pushed in or backwards, it was easy enough
to turn but with a horrible metallic scraping sound.
When the centre was pushed outwards it met with a fair
bit of resistance.
The second thing I couldn't avoid noticing was that
the three hexagon screws at the back of the clutch,
they rounded off very easily when trying to remove
them. The hex screws are soft steel and the hex is
very small, there is no tab washer so a drop of thread
lock is a sensible thing to use when you consider that
the three screws hold the whole clutch together. The clutch now in bits and the wear although slight
was obvious, predictable and is ongoing
Even if the bearings were lubricated properly, I'm
sure this clutch would still drag due to the steel
centre rubbing on the un lubricated steel bearing
insert, and alloy ring. A thin bronze bush each
side would have helped.

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500 miles more
After finding some Castrol Spheerol B2 grease (a
discontinued product), I have stripped, cleaned and
rebuilt the clutch. With the thought clearly in mind
that I have used the makers recommended grease and all
will be well from now on, I took the bike to the 2010
Bulldog bash. The weather was miserable, raining most
of the time, but the bike including the clutch worked
flawlessly, although a heavy lever operation, and it
led me to ask myself if I had been a little too harsh
in my criticism of this clutch. I got the bike home
and started to wash the Bulldog mud off the bike,
taking care not to get too much water in the direction
of the clutch. The answer to my
question regarding criticism of the clutch came only
two days later when I tried to move the bike. The
clutch had jammed up solid, I'm guessing that the
steel plates have rusted to the friction plates.
I did notice that the Castrol spheerol B2 grease does
fly off the clutch just the way the Tribol grease did,
this does not fill me with confidence, but we shall
see.
As I will soon be taking the bike some
1300 miles to Germany and back, and given the track
record of this clutch I would be a fool to just free
those plates and not rebuild the clutch completely.
Can you imagine rebuilding this thing at the side of
the road or even in a camp site? I
must point out that this is a dry, semi open, belt
primary, and the problems that I have encountered
shouldn't happen if it were used in sealed primary
cases and run in an oil bath. However this was sold to
me as an open belt primary.
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Please
note, clutch adjustment
Bob Newby recommends half a turn out of the pushrod
adjusting screw. If you are using a
Royal Enfield gearbox that has not been modified with
the new Hitchcock's outer cover, or
been modified as per the
Royal Enfield
clutch page of this website, then this
adjustment is not possible as the gearbox outer cover
flexes taking up any adjustment in the clutch. |