yamaha 200e throwing upoil out of crankcase vent!! help!!

[yamiekid]

ok so i got a yamaha 200e shaft drive wheeler im usualy pretty good with fixing about nethign but i cant figure out why this thing is throwing oil out of the crank case i just changed oil and it comes out all murkey brown and runny help me sumone

[muthey]

your carb is flooding into your piston have you smelled the oil yet, also sounds like you might need to adjust the valves if you think there is excessive crankcase venting

[fabiodriven]

your carb is flooding into your piston have you smelled the oil yet, also sounds like you might need to adjust the valves if you think there is excessive crankcase venting

Carbs flooding into the piston? :wondering

Properly adjusted valves are always a must, but improperly adjusted valves will not cause pressure in the crank case.


Let's start with the basics.

Did it do this before the oil change?

Is there a chance you over filled the cranks case?

What kind of oil did you use?

Does that have a fuel pump? If so, there is the chance that the faulty fuel pump is allowing gas to make its way to your crank case.

[muthey]

fabio there isn't a fuel pump on a yami 200e, it is gravity fed, also if the o-ring on the float needle base is shot it will flood even if the float is set right, and fuel seeping past the rings into the crank case might cause the murky brown and watery oil effect as that is an air cooled motor. I know from experience that once the air box fills to the point it cant fill with fuel anymore it runs into the cylinder and into the crank case, had that problem till I finally found the cause of my flooding. I also have curiosity on whether it smoked or not before the oil change, as heavy crank case pressure could be the effect of bad rings. One thought that really comes to mind is that there is water in the crank case, to cream the oil like that and a definite what kind of oil are you using? I have run my 200 L without the crank breather tube and it had a light pressure but no oil blow back so my thoughts lean towards that something is shot internally. No offense Fabio just read what you were confused with lmao no a carb itself cant flood into the piston but the fuel can, and he could have put in too much oil as well we need more information definitely.

[fabiodriven]

Good call, I forgot to ask if it smoked. We do need to know that as well.