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250cc and Above Engine Tech Technical Discussion Forum for 250cc and up Engines

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  #1  
Old 07-20-2015, 08:18 AM
akingjeeper1 akingjeeper1 is offline
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Default cn250 excessive oil from vent?

Hi. I installed a cn250 in my baja 150. It runs great but I have a ton of oil blowing out of the crank case vent tube when wide open. I then installed an oil catch can after doing some reseach, but it blows right out that to. The can has 3 ports, 2 on the bottom 1 on the top. The vent from the head to the crankcase had a "t" in it so I assumed the open port on the "t" was for the vent to atmosphere.i hooked that to 1 port on the bottom, then the other port on the bottom back to the adapter at the oil fill. The top port on the can is open. So why am I getting so much oil still? Please help.
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Old 07-20-2015, 09:06 AM
liduno liduno is offline
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Blow by can cause a lot of crank case pressure, too much oil can too.
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Old 07-20-2015, 10:48 AM
akingjeeper1 akingjeeper1 is offline
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Thanks. I checked the oil level and that's good. I was hoping it wasn't excessive blowby, the shop I got the engine from said it was good running condition before removing it to put a larger engine in.
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Old 07-20-2015, 11:15 AM
liduno liduno is offline
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A compression test should give you the info you need
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Old 07-20-2015, 11:32 AM
akingjeeper1 akingjeeper1 is offline
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Yea, that ll be next. Any idea where to find a manual for it?
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Old 07-20-2015, 01:16 PM
liduno liduno is offline
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Never even seen a repair manual for a Chinese buggy..lol The user manuals are so generic they're mostly useless.
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Old 07-20-2015, 01:49 PM
akingjeeper1 akingjeeper1 is offline
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Ok. With that said, it runs great, and has plenty of power. So when I put a gauge on it how would I know where it should be?
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  #8  
Old 07-20-2015, 04:28 PM
liduno liduno is offline
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I think between 130 and 150 but that's just what I've read on this site.
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  #9  
Old 07-22-2015, 09:59 PM
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Miamieddie Miamieddie is offline
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May have a bad oil ring.
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