TTR600 Enduro Oil leak

G'day everyone, I have a Yamaha TTR600 trail/enduro bike that has a constant
oil leak around the front sproket. I've replaced the seal two times now and
it still continues to leak. It doesnt have a huge leak at the moment (20c
piece size oil spot overnight) but I would like to know, why does it
continue to leak like this even after having a new seal installed.

Could I cut a piece of rubber to size perhaps and jam it in there. The seal
has a bracket to stop the seal from leaving the gearcase so I was thinking
of just cutting a piece of rubber to size and shape and installing that
perhaps this might just solve the problem once and for all...

Any help would be great..

Jeremy

 

Is the leak coming from the shaft (inside hole of seal) or the seals
mounting (outside surface of seal) OR somewheres else? I think you need
to track it down more carefully to be certain of the source.

-1) Shaft to seal leak. Well as you have replaced the seal already ...

are you certain you did not damage the seal putting it on? Some times
the shaft has a sharp area and when you put th eseal on it gets cut...
either file the sharp area or place a plastic tube over that area when
you put the seal on.

The shaft can ware where the seal bears on its surface ... sometimes you
can place the new seal slightly different so it bears on to a new area.
If the shaft surface is damaged then very thin bushes are avalible (see
Complete Bearing Service I think) that can be sliped on to dammaged
shafts ...

2) Use some silastic on the outer surface ... unless the seal is
spinning in the housing!

3) This will depend on what is actually leaking .. it may just be a
gasket gone.

 

Jeremy,
keeping foremost in you mind that there are some people in this world
who should not be allowed access to spanners (and I am one of
those...)

could be the 'front sprocket shaft' could be bend (slightly). As the
front sprocket goes round and round (as is its want), the shaft it
sits on is displacing the seal and wearing it out in no time flat.

you may have a bit more luck asking a dirt-bike forum. If the TTR was
known for this, they'd probably have heard of it and have a fix.?

try : http://www.dirtbikeworld.net



daniel

 

Maybe water got into the area and corroded the surface of the shaft. The
rust and rough surface would destroy the lip of any new seal in a hurry.
Was it ok for some days after you changed the seal? Then started off again?
See above. Don't know what's invoilved cleaning up the shaft (getting onto
it, possible removing it , getting it to an engineering place to clean it
up, then use smaller-ID seal)...
cheers
pete

 

Maybe water got into the area and corroded the surface of the shaft. The
rust and rough surface would destroy the lip of any new seal in a hurry.
Was it ok for some days after you changed the seal? Then started off again?
See above. Don't know what's invoilved cleaning up the shaft (getting onto
it, possible removing it , getting it to an engineering place to clean it
up, then use smaller-ID seal)...
cheers
pete

 

How much oil are you putting into it? Over fill it and will do what you are
describing. Also, is it possible that the surfaces are damaged or not clean
when you put the new seals on/in?

The rubber idea I would use as a last resort though, as you need to get some
rubber that will be able to handle that application.

I just re-read what you said and which gasket have you replaced? Is it
possible that it isn't leaking from somewhere else and you noticing it at
the front sprocket? I know its a long shot, but if you have the bash plate
on still, it will be hard to see where that oil is coming from (unless it is
bleedingly obvious).

All the best

Hammo

 

I'm pretty sure guys that it is leaking around the inside (hole) around the
shaft. I took great care in replacing the seal, and it has started leaking
almost straight away after installing the new one. I new that overfilling
the oil tank would'nt be a good idea so I ran the bike for a while with the
oil low (not enough oil to see at sight glass) and it still leaks, from what
I've seen the shaft is clean (no corrosion or anything) and have actually
seen oil weeping around the shaft during running. I wish to hell tho that
motorcycle companies would actually build motorbikes with decent sized oil
seals tho, this one is only about 3-4mm thick and absolutely piss weak,
hence the idea of making my own seal... Ha the bike only has about 5000km's
on the clock too.

Thanks for all your help tho, its given me some things to consider.

Jeremy

 

Erm, how are you checking the oil?
Also probably better to ask 1st....what year model is it?

I have an 01 model, and it's got a weird way of checking the oil. (external
oil tank/res)

On mine, you have to warm it up 1st......then let it sit for over 30secs.
Stand bike up straight and check the sightglass/dipstick.

They didn't tell me this when I 1st purchased the bike. (had it dropped off
at my place)

So bike arrives.....I rub hands together with glee.
Guy takes bike off back of ute.
Me waits till he has gone...(don't want to look like a tool dribbling on my
new toy now do I?)

Thinks I will be smart and go over the bike 1st (like I have heard others
doing) and double check everything before the big 1st ride.

So I gets out me spanners, and whilst looking at everything on the new shiny
toy......and fiddling with it's bits.....I double check all the bolts I can
get to are tight. And there is air in the tyres.....and the chain is
oiled/correct tension....

But shock Horror.......FARK....No bloody oil in the bastard.....WTF??

Jeeebus I think to myself........lucky I actually took the time out to go
over the bike 1st !!!!

Quickly run down the road and try about 10 servo's (now it's late at night)
and finally find some oil.
Get back home and pore some in....

Check oil again....
Hmmm pore more oil in.....

still nothin?? WTF

PORE more oil in......

Ahhh can see oil in the sight glass (WHEW)
Get the level correct......start bike then go for a ride (who cares if it's
pissin down and now really late....new toy has to be ridden)

Damn scary ride that, night time, rain, NEW Knobbie tyres, roundabouts. I
was slippin and sliddin everywhere.......tight 600cc single trying to throw
me off under acceleration....then trying to either flip me over the
handlebars or kick the backwheel out at 90degrees under deceleration (talk
about compression!!!)

Anyways.....then the next day I get off early to go give the boys at the
Yamaha shop an earfull....about sending a bike out with NO friggin oil in
it.

Have a little whinge to them, and demand they please go check the oil level
now. And BTW how much oil does this bastard take?? as you didn't give me a
manual with it (forgot to bring it with them when dropping off bike).

Guy checks it and says the thing is WAY WAY overfull.....drains the excess
out then shows me the manual + shows me properly how to check the oil.

Damn I sorta felt like a tool.....but then again I didn't really no any
better cos I had NO instruction on how to check the oil level, or any manual
to go off.

Anyways.....lucky I guess I didn't blow any seals etc.....

So um yeah.....make sure you are checking it correctly dude......

Tony Platt
Stanza

 

Oh yeah, so you reckon it's just icecream, eh?

 

Yeah I think also I have overfilled the oil tank, I did the same just kept
filling and filling the oil tank while the engine was switched off and until
I could see oil at the sightglass, perhaps this had something to do with the
original oil seal problem.

My dealer did the same thing, waited until I had signed up for the bike and
handed over the cheque and then told me that they couldnt find the Handbook.

So having said that I would'nt mind knowing exactly how much oil the sump
holds, and how to drain every little bit of oil out of the tank, sump,
etc...

Fuckn stupid idea that oil tank.

Kinda wished I bought the XR650 that I was looking at when I was at the
dealer.

 

That'll be the XR650R with a dry sump,and no sightglass?
Or the XR650L with a dry sump and no sightglass?

Postman Pat