Oil out of the breather hole

[dmdee99]

I need some help.

I have oil coming out of the breather hole on my 2004 crf250r.

The bike runs strong and I have no problems except for this.

Does anyone know what would cause this?

Any help would be appreciated.

 

[IndyMX]

Err, perhaps you overfilled the transmission?

 

[rmc_olderthandirt]

My experience is that an excessive amount of oil coming out the breather is due to an excessive amount of "blow-by" from the piston. You may need to refresh the top end.

Rod

 

[dmdee99]

I have been putting the recommended amount of oil in the tranny and in the engine. I do not fill it up to the max each time I do an oil change.

How do I know if I need a new top end on it. I got the bike last November and I ride about every 2 weeks when I get a chance. It still runs strong and starts up in about 2 kicks.

Should I just change it out to take a look?

 

[whenfoxforks-ruled]

Its past due already. It will run strong, till it will not start, or breaks. Vintage Bob

 

[2strokerfun]

My experience is that an excessive amount of oil coming out the breather is due to an excessive amount of "blow-by" from the piston.

Doesn't the Honda have separate oil for engine and trans??

 

[IndyMX]

Doesn't the Honda have separate oil for engine and trans??

Yes, you are correct.

 

[Patman]

How many hours are on the engine? I'll venture a guess it is unknown. Picking up an hour meter and a Factory Honda Service Manual will be two of the best purchases you ever make.

 

[dirt bike dave]

x2 on the overfilled transmission.

Just because it says 800ml (or whatever it says) on the sidecover does not mean to put that much in after a change. The stated capacity is probably if the thing is bone dry for initial assembly, and you never get ALL the oil of there when draining it.

 

[dmdee99]

I do not know how many hours the engine had when I purchased the bike. I know I have put on at least 30 hours since then.

I have the service manual already and I just need to get an hour meter and the piston kit.

I do not put the 800 ml in the tranny.

I put less than the required amount.

 

[Patman]

Unknown engine condition would indicate perhaps you should check your compression and plan on spenging a bit more than a piston and ring kit to get it back to a level you can feel won't end in a pile of tears and metal fragments.