Maintenance & Technical > KX250 / KX125

Breather Hose Mod, which hoses?

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Narkotik666:
Okay, i am sure that this has been discussed to death, trust, i've been searching to death.
First things first, I ride a 2005 KX250.
I RIDE Exclusively, i do track runs as warmup.
Now, i KNOW by now that my breatherhoses suck in water when the engine hits water and cools off.
so, i end up with WHITE liquid in the Tranny, don't worry my waterpump seals are fine, and the level never ever drops, it is definitly water being suck through the breathers.

NOW, i know that i should reroute my breathers higher on the bike (even the airbox).

ALL I NEED TO KNOW IS...WHICH HOSES are infact breathers (that suck in the water)...so i can reroute, or just point up higher when crossing water (which i do all the time.....i feel let down if i don't do atleast one gnarly river crossing, and yes, i am THAT GUY that charges through every possible puddle)

i see there is a thick black hose on the left side of of the crankcase, that points down??
and the 2 transparent hoses from the carb.

AM i right in assuming that the black hose is the crankcase breather and i can point it upwards? (bending it down again for oil to drip down), which of the carb hoses need to pointed up? and is there and other hose / vent that i should be weary of?

Thanks.

Hillclimb#42:
 I ride all over, through creeks and  huge mudholes constantly when play riding, and have only had milky in there when the water pump seal goes bad. the answer to your question though is that the small black one that connects to the top of the transmission is the only one that could possibly get anything to the crankcase. the other tubes connect to the carb which would deliver contaminates to the cylinder and could never get to the transmission. They do make filters to insert into the vent lines to prevent any issues with dirt. Also, I think its Doordie that I saw had a box deal on the swing arm that all of the vent lines connect to. I think the design there was to prevent spilling fuel and/or oil onto Supermoto tracks. My money is on the seal, the vent line would be submerged regardless during a deep water crossing.

Narkotik666:
thanks,
I thought it might be the seals,but i did a whole TEST process....
First time, rode in water LOTS OF WATER...."white" over the top of sight glass(meaning, it "added" so much liquid that the "fluid" in the sightglass is WAY higher than the required 800ml to have it in the middle of the sightglass.....coolant level normal.
Changed oil, rode in little bits of water(made sure that only the hoses are under water)....WHITE over the TOP of sightglass.....coolant level (analy checked, still the same)
changed oil, rode in NO WATER....Oil level, Normal, and normal color.
So, it seems that it only happens when i go through water, and i assume that its only the breather.
another assumption, if it is infact the waterpump seal, it would happen even if i just ride in the "dry" and i would loose coolant? which it didn't.

correct me if i'm wrong. please. i am NO expert. just from what i read in the forums, and i am sure that 80% of that is wrong in anywayz.

thanks for the quick reply.

Hillclimb#42:
No, sounds like you are thinking right. It would probably be weeping coolant at the water pump shaft and hardly ever be noticeable in the radiator. It just takes a little water to make the milky color. Filling it up past the sight window seems like alot of water. I don't think there is supposed to be any vaccuum there on that vent line, so you may be chasing a crank seal problem. i am more of the guy that tears them up, than the real expert, but I agree that something is abnormal by your description.
  When my water pump seal went, I had probably 3-5 seconds of milk that poured out before oil started to drain normally, so it does get alot in there. Way strange that it doesn't do it all the time. Can you feel a vaccuum or can u test for vaccuum on the vent line (while running)? The seal is super easy to replace and fairly cheap. I don't understand how it all operates normally, let alone when there is some freaky symptoms to chase, but you could easily be leaking vaccuum from case seals and sucking crankcase oil into the other side, and sucking air and water through the vent line. A leakdown test would conform or rule out a crank seal issue.

DoldGuy:
Assume = "Ass" "U" "Me"

You have gotten good info from Hill Climb.

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