Maintenance & Technical > KX250 / KX125
One way Valve on Crankcase Breather?
jonny500:
i totaly agree with bdi's last post. i have alot of experience with 2 stroke mx bikes and by the sound of it so dose bdi
demographic:
On my carb breathers I have connected the outlet pipe to a T piece, one part of the T faces down to the bottom of the bike and the other goes up into the airbox.
That way if the bikes in water the breather can't suck water up as the top pipe doesn't allow it to get any vacuum.
I assume it wouldn't be too hard to do the same with the transmission as well if needed.
There's a picture showing the setup that I copied here...
http://books.google.co.uk/books?id=kuYFuUqzNBMC&pg=PA100&lpg=PA100&dq=carb+T+vent&source=bl&ots=wK5lV5DLii&sig=luUXDuL5Md1hNONFxcPULZ-Af3s&hl=en&ei=ugklTOTIDMaSOOK_jLkC&sa=X&oi=book_result&ct=result&resnum=8&ved=0CDQQ6AEwBzgK#v=onepage&q=carb%20T%20vent&f=false
Narkotik666:
uurugh....okay, i better get some images of what i'm talking about.
i think i might be giving the wrong info. (i hope)
or that i am giving the right info (then i'm worried)
Doom prophecy.
but, surely, there will be so "sign" that the motor is going to pop....like sloppy throttle response, low power,etc etc etc.....if the seal are cooked and the motor is going to EXPLODE.
trust me.....the thing is as responsive and snappy and snarley as a squirrel on speed. (at the moment).
but i will post pics of what i'm talking about. and a full description of symptoms. before i loose a motor...cause i am taking the bike too "hell" this weekend......
Narkotik666:
okay, attached pictures. (hopefully)
where the new WHITE hose comes from, is that the crankcase breather?
it used to be a thick black hose that pointed down, and some oil and smoke would drip out of it (little bit, after and during some hard riding...it doesn't leak though.....) (is that normal?)
with the hose pointing down setup....i used to get water in my oil, from rivers and obviously trying to kickstart it in rivers with the end of the thick black hose submerged.
The second setup i tried, was with the thick black hose pointing UP....and with that...i had BEAUTIFUL GOLD OIL, after riding rivers and mud and puddles....so, it didn't suck in any water...but i had oil all over my pants and engine....as you can see.
so, what i did, is attach a longer white hose (it had the one way valve, but i removed it)....all i did was loop it up and to the back of the mounting it higher over the chain(the end pointing down)...so in theory it would act as a chainluber (hahaha, i know its silly, but, why not).
so the question is.....IS THE PART WHERE THE WHITE HOSE GOES IN, the Crankcase Breather....and what should be the NORMAL things i should see...
at the moment....it blows a bit of smoke...and drips a bit of oil, at speed. and i guess it sucks up water when kickstarting with the end submerged. (its NOT the water pump seals....i have golden oil when it pointed UP and away from water)
Hillclimb#42:
That must be a newer 250 than mine. My bike does not have that powervalve vent. I have a Yz125 that has that powervalve breather. The crankcase breather hose is the vent hose that comes off of the top of the transmission. Usually the carb lines are clear (stained brown) and the cranckcase hose is smaller and black. The hose you are pointing out there, comes from the powervalve. My 125 that has the same breather hose, drips oil and puffs a little smoke, too, but I cannot tell you the purpose. I do know the factory has it mounted to the frame pointing down and mine does not suck water on the yz125. Its definately not crank seals leaking, but could be a seal or gasket in the powervalve assembly. :wink:
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