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Old 05-23-2006, 02:34 PM   #1
acupuncture4u OP
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KTM oil leak behind front sprocket

07702250021 OEM part number. Bike bandit nubmer 4371419-001 O-RING 25,00X2,00 SILICONE $2.10

I think is what I need but the KTM boys at Fay Myers are clueless. I replaced an oil seal behind the sproket but didn't help. What's next?

Thanks

Dustin,

ps can the oring be replaced without taking the oil seal out???
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acupuncture4u screwed with this post 05-23-2006 at 05:46 PM
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Old 05-23-2006, 02:49 PM   #2
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Quote:
Originally Posted by acupuncture4u
07702250021 OEM part number. Bike bandit nubmer 4371419-001 O-RING 25,00X2,00 SILICONE $2.10

I think is what I need but the KTM boys at Fay Myers are clueless. I replaced an oil seal behind the sproket but didn't help. What's next?

Thanks

Dustin,

ps can the oring be replaced without taking the oil seal out???
And that's news to whom?

Check out the much vaunted "MeatPoopCycle Index Thread":

http://www.advrider.com/forums/showthread.php?t=102920
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Old 05-23-2006, 02:56 PM   #3
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Dustin, which flavor of KTM? RFS or LC4? If it's the former, BTDT. Be aware that the big washer is shaped to push against the sprocket and once torqued, stays flatter than needed when reused. I always use a large socket and a vise to reshape before installing during sprocket changes and no more leaks. In short, there's supposed to be tension against the sprocket with the perimeter of the large shaped washer.
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Old 05-23-2006, 03:35 PM   #4
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Fay Myers

Quote:
Originally Posted by acupuncture4u
07702250021 OEM part number. Bike bandit nubmer 4371419-001 O-RING 25,00X2,00 SILICONE $2.10

I think is what I need but the KTM boys at Fay Myers are clueless. I replaced an oil seal behind the sproket but didn't help. What's next?

Thanks

Dustin,

ps can the oring be replaced without taking the oil seal out???

Why dont they care about ktm at Fay Myers?
I have met the manager and he seams nice enough?
He has a 950 adv and 525 exc you would think
He would stock more parts and gear.Elite has great
ktm gear.Fay Myers does not even have a fucking
ktm sticker. I was at Elite 2 weeks ago and picked up
this killer jacket.They had my size and its brand new.
scott first > 950 adv photo
Oh well Ill have to make the trip up north to go to
Elite to get all my stuff.
Please god dont let me buy a new Aprilia RXV 550
From Fay Mayers ill reget it but i really want
that bike!!!



ps I told dustin to check the fucking 640 thread index
firstworks
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Old 05-23-2006, 05:44 PM   #5
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That thread index is so huge you get lost in there. Thanks anyway for the help. So can I replace just the o-ring or do I have to do the seal again?

D

ps, nice looking crap jacket that got your elbows???
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Old 05-23-2006, 06:49 PM   #6
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Check out what Arch said, and if you have used an aftermarket countershaft sprocket (like a Renthal), you will have a leak no matter what you do.
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Old 05-23-2006, 07:18 PM   #7
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leak

I would replace both at the same time.
Less chance for problems.

hope you are ready to ride this weekend.
Its been to long.

scotty
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Old 05-23-2006, 08:49 PM   #8
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Quote:
Originally Posted by acupuncture4u
That thread index is so huge you get lost in there. ...
Noted. And thanks for the feedback. Ctrl-F allows you to search the page if the organization doesn't work for ya. I am trying to more the less essential stuff to Post #2 - someday, somehow...

Try this: "Creeper's LC4 Sprocket Seal Replacement"


There was a poor fella with the same issue (might not be from the same cause however) recently, but I don't think his fix was indexed. The problem was a non-OEM front sprocket that was too thin and... you can figure it out. Here are some threads (including that one - easy forum search):

http://www.advrider.com/forums/showthread.php?t=77903
http://www.advrider.com/forums/showthread.php?t=127299
http://www.advrider.com/forums/showthread.php?t=95969

PS - firstworks, you look far too serious in that pic.
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Old 05-24-2006, 06:13 AM   #9
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First off, I don't know squat about those LC4 bikes, but on my sans linkage 200 EXC I replaced that seal/ o-ring and it STILL leaked. Come to find out I wasn't running the chain loose enough, which put unneeded stress on the sprocket shaft, causing the leak. Again, this was on an EXC, I do not know about the 640 if this would help or not...just an idea.
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Old 05-24-2006, 01:57 PM   #10
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Quote:
Originally Posted by firstworks
I would replace both at the same time.
Less chance for problems.

hope you are ready to ride this weekend.
Its been to long.

scotty
You see the problem is that I have already replaced the seal and want to replace just the oring now. I think that can be done. But maybe this is just in vain because I went to buy a 42 tooth rear sprocket and got sold a 40. My mechanic suggested I put a 14 tooth on the front to give the desired effect.

So yes I don't have the original stock front sprocket, that could possible mean continual leaks because of weak pressure? Would a spacer help and if so any idea of the stock size sprocket???

Thanks

Dustin
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Old 05-24-2006, 02:07 PM   #11
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The stock OEM sprocket is all of $25... what's your time worth figuring out a work-around?
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Old 05-24-2006, 02:10 PM   #12
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Quote:
Originally Posted by gaspipe
and if you have used an aftermarket countershaft sprocket (like a Renthal), you will have a leak no matter what you do.
That's an old wives tale, the only difference is that the original has a dampner pad fitted, I ran the renthal for 7k miles with no problems, and I know other people that have run them much more than that, the continual leaks are down to bad fitting of seals or/and over tightening the chain.
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Old 05-24-2006, 02:17 PM   #13
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Quote:
Originally Posted by Buckster
That's an old wives tale, the only difference is that the original has a dampner pad fitted, I ran the renthal for 7k miles with no problems, and I know other people that have run them much more than that, the continual leaks are down to bad fitting of seals or/and over tightening the chain.
Here is a useful tip from Happe (from one of the threads I linked above):

Quote:
Originally Posted by Happe
...
If soething is not right you made a mistake while putting everything back together. A very famous mistake is the little O-Ring seal behind the sprocket. If the washer with the O-ring on slips out, the ring is likely to sit behind the washer and the mainshaft looks like it is to short and the nut/bolt will not fit properly. The engine will also leak oil at that point.

cheers

Stefan
Not sure if that is your issue, but it's in the ballpark so what the hey.

buckster, look here:
http://www.advrider.com/forums/showt...=127299&page=2
the fella didn't ever say which it was (perhaps it was el cheapo...), but the aftermarket ones can be too thin.
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Old 05-24-2006, 02:27 PM   #14
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That sprocket is the EXC sprocket, the splines are the same but the sprocket is thinner, fitting the wrong part is never a good idea, the Renthal for the LC4 is spaced exactly right.
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Old 05-24-2006, 03:09 PM   #15
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The KTM OEM sprockets are made by ESJOT.

Here is the LC4s:
http://www.esjot.com/uk/index.php?me...III=773&SCIPI=

And here is the EXCs:
http://www.esjot.com/uk/index.php?me...III=759&SCIPI=

8.8 vs. 11.5 - that makes sense buckster.

How cheap is the Renthal? I misquoted the KTM OEM sprocket above - it is only $16 - the rear steel is $25. Just how (bleep)ing cheap are the aftermarket sprockets that they are worth us discussing this shit ad-naseum?
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