docc Posted July 11, 2021 Share Posted July 11, 2021 These observations make me suspect that the inside of our frame spines, that are supposed to drain the liquid oil portion of our crankcase breather, can become compromised (clogged or restricted) and force more crankcase breather oil through the left side of the airbox. Link to comment Share on other sites More sharing options...
Lucky Phil Posted July 11, 2021 Share Posted July 11, 2021 1 hour ago, docc said: Is it wet around the outside of it, or is all that oil coming from the crankcase venting and trying to get out from inside the airbox on the left side? Thats my suspicion docc. The breather into the airbox is also on the Left hand side as well. Ciao 1 Link to comment Share on other sites More sharing options...
Lucky Phil Posted July 11, 2021 Share Posted July 11, 2021 1 hour ago, docc said: These observations make me suspect that the inside of our frame spines, that are supposed to drain the liquid oil portion of our crankcase breather, can become compromised (clogged or restricted) and force more crankcase breather oil through the left side of the airbox. Nothing works perfectly docc it's a pretty crude system so some oil vapour still gets in the airbox and condenses over long periods of time. Who here periodically gets in and wipes out the airbox interior? Ciao 2 Link to comment Share on other sites More sharing options...
footgoose Posted July 11, 2021 Share Posted July 11, 2021 4 hours ago, docc said: These observations make me suspect that the inside of our frame spines, that are supposed to drain the liquid oil portion of our crankcase breather, can become compromised (clogged or restricted) and force more crankcase breather oil through the left side of the airbox. We've got a thread on this problem here back a year or so. Yes they do fill with crud over time. Was it member antmanbee that flushed his frame with kerosene ? Link to comment Share on other sites More sharing options...
Lucky Phil Posted July 11, 2021 Share Posted July 11, 2021 2 hours ago, footgoose said: We've got a thread on this problem here back a year or so. Yes they do fill with crud over time. Was it member antmanbee that flushed his frame with kerosene ? I wouldn't recommend that personally. Unless there is debris clogging something all you do is loosen up stuff you don't want to. The drain line is via a banjo fitting anyway so it's a horizontal inlet the the pipe so contaminants don't tend to enter unless there's a LOT of stuff, usually rusty stuff in the spine. Ciao 1 Link to comment Share on other sites More sharing options...
Tinus89 Posted July 11, 2021 Share Posted July 11, 2021 19 hours ago, docc said: These observations make me suspect that the inside of our frame spines, that are supposed to drain the liquid oil portion of our crankcase breather, can become compromised (clogged or restricted) and force more crankcase breather oil through the left side of the airbox. I have experienced my return line banjo, which is made of a different material compared to the steel of the frame tube, to be partially filled with corrosion product & debris. I cleaned it out when I found it. I can't confirm this would cause the leakage as described as I do run pods (came without air filter box when I bought it) and my breather line runs to the ground. 1 Link to comment Share on other sites More sharing options...
leroysch Posted July 13, 2021 Author Share Posted July 13, 2021 Inspected the plugs, intakes...cleaned out the sump and strainer...and got around to cleaning the air box which had been laying on the bench. I was surprised by the amount of fluid which had pooled inside (~ 1ml or so) and got curious. Looks like the air box has a false bottom ending near the aft end. In any event set this up to help mop up whatever cares to dribble down. Will rotate it 180 degrees and see if anything comes out from below the false bottom. I know, OCD...but might as well satisfy my curiosity while it's off the bike... 1 Link to comment Share on other sites More sharing options...
Lucky Phil Posted July 13, 2021 Share Posted July 13, 2021 5 minutes ago, leroysch said: Inspected the plugs, intakes...cleaned out the sump and strainer...and got around to cleaning the air box which had been laying on the bench. I was surprised by the amount of fluid which had pooled inside (~ 1ml or so) and got curious. Looks like the air box has a false bottom ending near the aft end. In any event set this up to help mop up whatever cares to dribble down. Will rotate it 180 degrees and see if anything comes out from below the false bottom. I know, OCD...but might as well satisfy my curiosity while it's off the bike... Pull the inlet trumpets out and get your hand or a rag on a stick in there and give it a good clean out. Ciao 2 Link to comment Share on other sites More sharing options...
docc Posted July 13, 2021 Share Posted July 13, 2021 I reckon I should add this to the Tank Off Maintenance Checklist . . . Done: [I also edited the topic title to make this more searchable. Hope this is okay with the OP, @leroysch . . .] 1 Link to comment Share on other sites More sharing options...
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