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Iceracer07

2003 yz450f

3 posts in this topic

Hey guys I have a 2003yz450f I was out riding on ice today an when I was done an in loaded bike I noticed two drips of milky oil from the big black tube coming from top of motor. I checked engine oil and farm oil both in good condition. Any ideas?

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Hey guys I have a 2003yz450f I was out riding on ice today an when I was done an in loaded bike I noticed two drips of milky oil from the big black tube coming from top of motor. I checked engine oil and farm oil both in good condition. Any ideas?

It happens in wet conditions. There is oil residue in the tube and when you get some water/ice/snow/h20 substance of your choosing up in there it comes out milky. If all the oil in the motor and tank is good I would say your fine. If you want to be safe pull the valve cover and check the top end for milky sludge build up. If your getting water in the motor from insert source here it steams in the hot oil and collects in the top end tends to show the most signs of water contamination.

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I would guess the engine isn't getting up to temperature to help get rid of moisture. It doesn't have a positive crankcase ventilation system so all it really rely's on is the piston creating crankcase pressure and forcing moisture out. It also pulls air and moisture back in too so it's kinda sorta effective. If you have a temp gun I would shoot the head / cylinder and see what temperature it's at since you are riding in obviously cold conditions. I have had to put cardboard or tape over one radiator on 2 strokes years ago to get them up to temp when riding in snow. Getting it up to temperature should help with the milkiness some I would think. Clay

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