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Post by jjoshua20213 on Dec 14, 2013 20:05:25 GMT -5
When the bike is on the stand and I take the air filter off and rev the bike to wot, I see a mist of liquids spraying out. Ive noticed oily looking liquids, almost green in color inside the stock airbox when I was using it. And I know its spraying all over my free flow filter. Is it supposed to do that?
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Post by rockynv on Dec 14, 2013 22:15:35 GMT -5
When the bike is on the stand and I take the air filter off and rev the bike to wot, I see a mist of liquids spraying out. Ive noticed oily looking liquids, almost green in color inside the stock airbox when I was using it. And I know its spraying all over my free flow filter. Is it supposed to do that? When you redline an engine and take it to the point of blowing up holding it at WOT that is what will happen. You really should not do that unless you are intentionally trying to make it fly apart. If you are just burping the throttle that will happen as intake vaccume will drop so low that the pulsing of the intake cycle will cause some backflow. With the throttle plates closed vaccuum will be in the 15 to 20 inch range however at WOT it will drop to almost zero and pulse back at you for a few moments. If you have not adjusted the valves in a while it can become more pronounced. Also most OEM air boxes have a tuned tube and port sized to minimize this. |
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Post by jjoshua20213 on Dec 15, 2013 1:36:40 GMT -5
When the bike is on the stand and I take the air filter off and rev the bike to wot, I see a mist of liquids spraying out. Ive noticed oily looking liquids, almost green in color inside the stock airbox when I was using it. And I know its spraying all over my free flow filter. Is it supposed to do that? When you redline an engine and take it to the point of blowing up holding it at WOT that is what will happen. You really should not do that unless you are intentionally trying to make it fly apart. If you are just burping the throttle that will happen as intake vaccume will drop so low that the pulsing of the intake cycle will cause some backflow. With the throttle plates closed vaccuum will be in the 15 to 20 inch range however at WOT it will drop to almost zero and pulse back at you for a few moments. If you have not adjusted the valves in a while it can become more pronounced. Also most OEM air boxes have a tuned tube and port sized to minimize this. I could rev it slow or fast, but at a curtain point in the throttle I start to see the mist. The vacuum explanation makes sense. Why would it be more pronounced if the valves need to be adjusted? |
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Post by wilds on Dec 16, 2013 0:34:14 GMT -5
There is a small overlap of the opening times of the valves and the backpressure in the exhaust is causing this.
It's normal and OK.
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