Cr 85 overheats

Joined
Jun 30, 2019
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#1
I’m pulling my hair out over here with a cr85 it was overheating not long after I got it home so I rebuilt the top end the oil was milky and used half the coolant in ten minutes of riding. After the rebuild it did the same thing again head and base gasket were blown and cylinder full of coolant after 10 minutes. I just pull the clutch side case off and the water pump looks fine. Not sure what’s causing this. I had the cylinder and head at s machine shop and they said there was no worping
 
Joined
Jun 14, 2019
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#3
Are you torqueing down the bolts to specs? I have rebuilt quite a few 2 strokes and never had issues. Check your manual for specs, be sure you have all parts sealed up correctly, everything adjusted properly, and engine rebuilt correctly.
 
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_JOE_

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May 10, 2007
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#4
Milky oil makes me think the water pump seal is leaking. That's really the only path for coolant to get into the transmission. Also check to see that the copper washers are present under the head nuts, if there was coolant on top of the piston the head gasket was leaking.
 
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