NEED HELP breather pouring oil into airbox!

[MX450]

Today i went to start my bike to go ride and it took FOREVER, usually its the first or second kick. It finally started running so i thought maybe i needed to adjust my valves, then i was letting it warm up and i noticed something dripping from the airbox, i take the seat off and the case breather is pouring oil into my filter!! I cant figure out why it would do that. Last time i rode it was fine... anyone had this happen before??

[Nick110]

It happens to me sometimes. I think its from it over heating. Anyways I did the breather mod and Im gonna see if it stops

[MX450]

Well i couldnt be overheating i had just started it up

[Nick110]

Do you have a stock motor? If not whats done to it?

[Chino886]

Check your oil level on both sides of the motor

[MX450]

yea tranny was low.. engine was overfilled:ermm: guess im goin into the bottom end.

its a bone stock 05 btw

[hendershot106]

Originally posted by Nick110
It happens to me sometimes. I think its from it over heating. Anyways I did the breather mod and Im gonna see if it stops

HUH??? whats the breather mod??????????????

[Chino886]

Originally posted by MX450
yea tranny was low.. engine was overfilled:ermm: guess im goin into the bottom end.

its a bone stock 05 btw

Great idea!

I am glad that you are deciding to rebuild it rather than ignore it!

[speedfreaksguy]

Originally posted by MX450
yea tranny was low.. engine was overfilled:ermm: guess im goin into the bottom end.


It's just a seal, not a big deal to change. No need to split cases.

[Chino886]

Originally posted by speedfreaksguy
It's just a seal, not a big deal to change. No need to split cases.

How do you change the seal with out splitting the cases? I want to know for future reference please.

[MX450]

Originally posted by Chino886
Great idea!

I am glad that you are deciding to rebuild it rather than ignore it!

Oh theres no ignoring it, it was dumping it into my air filter

[pro-rider46]

that sounds funny, cause normaly when it spews oil, you over fill the tranny side.

[speedfreaksguy]

Originally posted by Chino886
How do you change the seal with out splitting the cases? I want to know for future reference please.

You can easily get a seal puller between the bearing and seal. Or you can turn a screw into the seal and pull it out.

[MX450]

ok so if i need to go into the bottom end are there any special tools i need??

[Nick110]

Ever figure out what was wrong, cause my cases are getting split to fix my tranny so Im gonna fix this to?

[MX450]

yea i figured it out i think.. there was gas in my oil causing it to overflow, i guess the carb was clogged, i pulled the carb, cleaned it out and now its running fine.

[Nick110]

Originally posted by speedfreaksguy
You can easily get a seal puller between the bearing and seal. Or you can turn a screw into the seal and pull it out.

What seal is it?

[bloodmoney23]

alot of time if breather spews out oil then there is a kink in the line which in turn builds up enuf pressure to force it out.

[Nick110]

Originally posted by bloodmoney23
alot of time if breather spews out oil then there is a kink in the line which in turn builds up enuf pressure to force it out.

There is no kink. Even when I tip it up on the grabbar it pours oil into the air box. It also does it when Im riding and its not overfilled.

[bloodmoney23]

ill check the manual and get back with you because that dont sound right. Ive never seen it pour out of breather unless a bike was running. Normally you may get some gas in your airbox if you flip it up on grab bar and dont have fuel off. are you positive that you have all the hoses hooked up right? but like i said, ill check it out and see what could be causing that.

[Nick110]

Yep positive. My dealer told me it was normal when I asked them. :rolleyes:

[400exrapes]

On my old 400ex i freaked out pretty much cause my thing would take forever to start, never stay idling and when we would leave to go riding i would stall on deceleration down the street and get pulled back by the big 400 utility.... oil in airbox and spurting out air filter.... I overfilled it so i drained some and it was perfect. Drain some oil to between low and high and i think it will run perfect.

[440challenger]

If your tranny is low and your engine oil is high it can either be your large right side clutch cover gasket is torn allowing the two chambers to mix. (have you took the clutch cover off for anything recently and pinched the gasket maybe)

Or its your right hand side crank seal. If its the crank seal it usually leaves about 400-500ccs of oil in the tranny side after a few rides due to the level being below the crank seal.

To change this seal you first need to know if you have a stock non up dated crank or if you have the updated crank with collar.
The updated crank with collar uses a larger inner diameter seal.

This can be replaced in about an hour to and hour and a half.
You need to remove the large right side clutch cover,the whole clutch basket assembly and one of the gears behind it.

But before you change that seal, i would remove your oil filter and look for any shavings or pull the ign side cover and check the crank for play. Your bearings could be going causing the seal to be irregular at times.


If your oil wasnt transfering i would be saying she had a bit of blow by but that does not sound like the case

[Nick110]

Originally posted by 440challenger
If your tranny is low and your engine oil is high it can either be your large right side clutch cover gasket is torn allowing the two chambers to mix. (have you took the clutch cover off for anything recently and pinched the gasket maybe)

Or its your right hand side crank seal. If its the crank seal it usually leaves about 400-500ccs of oil in the tranny side after a few rides due to the level being below the crank seal.

To change this seal you first need to know if you have a stock non up dated crank or if you have the updated crank with collar.
The updated crank with collar uses a larger inner diameter seal.

This can be replaced in about an hour to and hour and a half.
You need to remove the large right side clutch cover,the whole clutch basket assembly and one of the gears behind it.

But before you change that seal, i would remove your oil filter and look for any shavings or pull the ign side cover and check the crank for play. Your bearings could be going causing the seal to be irregular at times.


If your oil wasnt transfering i would be saying she had a bit of blow by but that does not sound like the case

Hey thanks a lot man. Im gonna go ahead and replace both casue My motor is completly disassebled right now. I have an 06 motor and Im pretty sure it doesnt have an updated crank or anything.

Do you have the part numbers by chance?

[440challenger]

No prob. Go to www.onlinemicrofiche.com for detailed parts diagrams and part #'s

[Nick110]

Hey is the right crankcase seal part Number- 5221720-001.

And is the Clutch cover seal part number- 2914204-001.

Sorry about this man but I just wanna order the right parts.

[baker400ex]

my 07 did that....i was jus goin around the track n looked n saw my plastic was real dirty so i stopped...(white plastic showed everything) it was a hose by my airbox.....i just puta gas cap vent on it....i havent had problems since...

[440challenger]

No...

you have an 06 honda 450 correct?

11394-HP1-600 GASKET, R. COVER $18.11

91202-HP1-601 OIL SEAL (39X60X7.5) $13.15

[Nick110]

Originally posted by 440challenger
No...

you have an 06 honda 450 correct?

11394-HP1-600 GASKET, R. COVER $18.11

91202-HP1-601 OIL SEAL (39X60X7.5) $13.15

Ok dude thank you so much.