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<blockquote data-quote="ossagp" data-source="post: 202987" data-attributes="member: 1650">Exactly.&nbsp; (As stated before.)&nbsp;&nbsp; Most bleed backs etc are on the pump or very near it rather than upstream,&nbsp; therefore makes it quite simple to trace or clear a line simply by removing the filter if there is one.&nbsp; Some filters contain a valve of sorts known as a bypass and that can keep oil from bleeding back down too.&nbsp; Having it remain up in the lines is a two edged sword:&nbsp; If it stays up in the head where it gets hot,&nbsp; and in the case of early honda xr's even in the supply tube which runs up a stud on the cylinder it ends up baking when the motor is shutoff hot.&nbsp; anyway,&nbsp;&nbsp; Joni it isn't something to stress about.&nbsp; right now honda crf's are the only bikes i know that have a &quot;one way valve&quot;.&nbsp; that one is again, not used for the purpose of holding the oil up stream (the outbound flow) of the pump.&nbsp; it rests in the bottom of the case,&nbsp; consists of a screen and a &quot;reed&quot; that keeps the oil that is scavenged (the downward force from the piston pushes the oil out) from the crank case in the tiny reservoir from drifting back to the crank cases and collecting there.&nbsp;&nbsp; It keeps it a basic dry sump in a way.</blockquote>

[QUOTE="ossagp, post: 202987, member: 1650"] Exactly. (As stated before.) Most bleed backs etc are on the pump or very near it rather than upstream, therefore makes it quite simple to trace or clear a line simply by removing the filter if there is one. Some filters contain a valve of sorts known as a bypass and that can keep oil from bleeding back down too. Having it remain up in the lines is a two edged sword: If it stays up in the head where it gets hot, and in the case of early honda xr's even in the supply tube which runs up a stud on the cylinder it ends up baking when the motor is shutoff hot. anyway, Joni it isn't something to stress about. right now honda crf's are the only bikes i know that have a "one way valve". that one is again, not used for the purpose of holding the oil up stream (the outbound flow) of the pump. it rests in the bottom of the case, consists of a screen and a "reed" that keeps the oil that is scavenged (the downward force from the piston pushes the oil out) from the crank case in the tiny reservoir from drifting back to the crank cases and collecting there. It keeps it a basic dry sump in a way. [/QUOTE]

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