metal shavings in g/box oil

Hi all, what is an acceptable level of metal particles in your gearbox oil when you drain it.Today when i drained my gearbox oil i found a couple of fine slivers of metal almost like pieces of swarfe about 0.200" long and about 0.015" thick , should i be concerned about these pices. I also usually find a small amount of small metal flakes which appear like glitter floating in the bottom of my oil drain container which i would assume is normal ( correct me if im wrong ). The bike is an 08 yz250 with 40 hrs on it , no gbox problems yet.

First few oil changes will yield some metal.. How many changes have you done?? Chunks are bad, shavings are usually ok... Likely just some debris from the clutch...

shavings are fine, if you want you could probably find a magnetic plug which will catch most shavings and hold them until you remove the plug for an oil change

You have to reinstall the drain bolt straight or it will cross thread and make shavings.

You have to reinstall the drain bolt straight or it will cross thread and make shavings.

I never thought of installing the plug straight, i thought installing the plug crooked was the correct way ( HAHA ) !

On my 06 I used a magnetic drain bolt after the first oil change. I still pick up metal.....maybe "pick up" is too strong. I can still "wipe off" metal from the magnet. I believe it comes from the clutch plates. The pieces are very small.

Even the first oil change showed few metal particles. Much less than I expected.

Thanks for the replys , another question i have is how much if any wear would you expect to see on the primary drive gear that is attached to the clutch basket after about 40hrs of use ( you can see the teeth of the gear when you remove the oil filler cap ). I have a liitle bit of wear showing on the teeth , just not sure wether this is normal or not.

Thanks .

i have an 03 and have little wear, of course it is normal for a gear inside an engine to wear, anything moving will wear overtime... unless you have broken teeth or rounded teeth it should be ok

I've just changed the oil, and some pieces (4 or 5) of the size TS describes came out (0,2" long and 0,015" thick). The surface is smooth, so I quess they are from worn teeth or something. My bike has run about 170 hours. Is this wear normal? Should I maybe split cases soon? This is my first change using a magnetic plug

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now

  • Similar Content

    • By faizakhtar125
      Hey guys I read an article saying that the 01 YZ125 has six gears. But other people are saying that it's 5. How many gears does it have? Just asking. Thanks.
    • By idratherberiding
      2006 YZ 250.. The manual calls for 10w30 (yamalube 4 stroke oil), can I use 10w50 (Motul semi sythetic 4 stroke oil) ??   I bought the bike, want to change the gear oil before I ride tomorrow but all I have at the moment is the Motul 10w50  semi synth.  Is that oil going to be too thick compared to the 10w30 or will it be fine..  Thanks
    • By faizakhtar125
      Hey guys I just wanted to show off my bike and show it to the world lol  What is your opinion on it. God or bad, please be honest. I am open to all comments and suggestions. Any upgrades I should do to make it look better and/or faster?

    • By Allooushh
      I bought a YZ250F yesterday and the previous owner said apparently it runs but they weren’t strong enough to kick it. I couldn’t kick while there so I took their word for it and bought it. I’ve been trying to get it to fire all day today, there are 2 chokes and I’m unsure if the air mixture is correct, so would be nice to know what I should do, it’s hard to adjust the air screw when the bike won’t even run. I noticed the spark is kinda low, I don’t know if it’s normally supposed to be like that or not. I can see a blue spark but it is very small and crappy, I’ve had thumpstars that generated stronger spark, I changed the plug it’s still the same, so maybe could be an electrical problem, the only ground connection I could find was for the ignition lead which I filed down to bare metal so I’m pretty sure that connection is good. Anything else I’m missing? It’s very hard to kick and I can feel the compression out of the exhaust so I don’t think compression is the issue.Just wanna know what I should do, haven’t owned a yz before so I could be not using the choke right or something. Thanks