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Dry Thrust Bearing Yamaha XJ600N
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I own a 2000 Yamaha XJ600N, have done so since new and it has 29000
miles on the clock.
About three months ago after some clutch problems I dismantled the
clutch and found the thrust bearing had completely collapsed.
Thorough clean out and replaced the bearing, plates were fine within
makes specs.
A couple of weeks back the clutch started to play up again and make a
rattling noise; dismantled the clutch housing and the thrust bearing is
bone dry.
I have uploaded images (300KB) as follows;
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That looks very dry!
Is that really meant to be a dry clutch? Could you check this point out
with a dealer?
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Oh yes, level window in side of case.
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The photo looks as if the casing is not really intended to hold oil
(judging by the photos), which tends to support the dry clutch is
intentional theory.
Sorry I can't be more help.
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No problem, thanks for the interest.
Geoff Lane
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I have spoken to a few more knowledgeable persons than myself and all
feel it is splash lubrication for the bearing and are puzzled as to the
problem.
From the images I cannot see where any lubrication would feed, any
suggestions as to problem would be appreciated.
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Tell us, Geoff, how much oil is (usually) in your engine?
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About 2/3 visible in he window when standing on the centre stand.
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Are you using the correct procedure for checking the oil? Consult your
manual.
Some bikes (Yamahas...) need to be checked about a minute after
shutting the engine off.
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Geoff Lane
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Your head gasket's gone or you do 1/2 mile a day. Aren't you concerned
about all the white goo in the bottom of the engine?
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During the week my commuting journeys are short and yes I am concerned
about the white goo but at the moment I am wondering why oil is not
appearing to get to the inner part of the clutch.
Geoff Lane
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Geoff Lane
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Hi Geoff,
I believe there is a little modification to be made when fitting a new
bearing which increase its life.
Can't remember where I got the information from... think it may have been a
local mechanic.
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Thanks David, I'll continue to enquire but have already spoken to two
dealer mechanics who both concur that once the engine is turning oil
should get in to the bearing with all the splashing about.
Geoff Lane
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Hi Geoff
I think the mod involves making a drilling that allows more oil to get to
the bearing, if you are interested I can probably put you in touch with
someone that knows about this item.
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Thanks David, if there is a mod I assume there must have been a problem
along the line.
If you have the contact details to hand I would appreciate them but I
will mention it to a mate of mine who rebuilds bikes for a hobby; he may
have an idea.
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Hi Geoff
Give this company a ring, contact details at:
Ask for Stephen, I am certain it was him I saw carrying out this
modification on a XJ600 last summer.
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Thanks David.
Geoff Lane
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I have found a few mentions on the Internet of this problem and it
seems it is well a known problem of the xj600. Part of the problem is
internal condensation due to the engine not becoming hot enough when
used on short runs - the fix for this is a modified breather available
from Yamaha for £25.
There is also a problem of inadequate lubrication to the thrust
bearing, this is suggested to be helped by drilling holes in the plate.
It gave no other details - no sizes for the holes, number of holes, nor
any clues as to which plate to drill the holes in.
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HTH, David
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Geoff Lane
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HTH, David
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