125-200cc Countershaft Worn beyond limit?

I need a little help from someone who has used and abused their bike as much as mine has been.

I'm rocking an 09 WR125. When I purchased the bike, it had roughly 120 hrs on it. Lost the hour meter, got a new one, yadda yadda yadda... I'm thinking the bike has around 145 hrs on it now...

I noticed the countershaft seal leaking, so, I get a new one, and replaced it with an OEM seal.. This is not my first seal install. I have done it twice on my 450, so I know not to drive it in to far!

I feel I got it set just right, and cleaned everything out really well before install. Well, needless to say, it's now leaking again. Not fast, but sprocket is wet with oil.

When I installed the seal, I noticed the countershaft sprocket has some significant play on the shaft. I am heading to the garage for a day of wrenching, and will try to get a good video of the sprocket play.

I'm simply wondering, with 145 hrs on the bike, could the countershaft be worn out of spec? I have almost 200hrs on my 450, and no problems with that bike.

Thanks!

Behind your sprocket is a bushing and inside the bushing that rides on the shaft is an o ring placed inside the bushing. Replace bushing/oring and you are good as new.

will give that a try for sure! Thanks!

The loose sprocket has nothing to do with the leak...unless the shaft was not heat treated or something.

The 125 shafts last forever...the 610 has a wear issue.

Anyway, I have a spare if you need it.