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Old 10-06-2008, 08:28 AM
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Default Gear Shift Oil Leak

hi i'm trying to find out if the engine needs to come apart to change whatever is making oil dribble from the gear shift spline on my yz125 04?

I can do track side maintenance, but any job needing proper workshop, i take in. I have an idea its an oil seal leaking, the service manual doesn't show that part. i'm thinking perhaps i can lever an oil seal outwards and replace it? (i haven't got my bike here)

any advice would be cool
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Old 10-07-2008, 08:04 AM
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No - you can extract the seal without splitting the cases. The shaft is in the way which makes it harder but it can be done. Just be very cautious not to booger up the case. One way is to thread in a few sheet metal screws into the seal (not too far) and use them to extract the seal. It pops out pretty easily.

The easiest way is to pull the shift shaft.

Scott
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Old 10-07-2008, 10:51 AM
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hi, scott, thanks. just to make a bit more clearer, which way does the gear shifter oil seal come out from? outside or inside? do i need any gaskets? i can't find any closes ups in the service manual it doesnt show it.
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Old 10-07-2008, 11:42 AM
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It pops right out from the outside.

If you do the job with the shaft in place, you will need no gaskets.

If you plan to pull the shaft, you will need to remove the clutch, so you will need the right side cover gasket and maybe a power valve cover gasket (I usually don't replace this gasket every time).

The seal is not really in there all that tightly. You will likely be suprised how easily it comes out. Just watch out not to booger up the place where the seal goes in - there is a small ledge around the seal and if it gets crushed over it can be a chore to get a seal in there without a leak.

Scott
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Old 10-16-2008, 08:56 AM
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I finaly got a round to doing the oil seal yesterday. I was surprised how easy it came out. Thanks for explaining it!
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Old 10-16-2008, 09:02 AM
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Glad I could help and thanks for the update.

Scott
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Old 10-16-2008, 01:20 PM
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Hi there... and did ya check why the seal was leaking? did you hit with the shift lever on something hard like a...bike rock?

Vando
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