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Discussion Starter #1
How often is one supposed to pull the plug on the right side air cleaner (Coffin) drain tube to let accumulated water and oil blow residue out? Does anyone do this at all?
And why does the under tank air filter not have such a drain tube? Where does the accumulated water and oil blowback from the undertank air filter go to?
 

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The OEM build use a one-way PUKE valve to handle excess oil from the breather into the air box. There is a channeled area in the box and baffle that connects to this external one-way valve shown in the enclosed photos. This oily deposit would run down the front LH down tube of the stock bike as shown in the enclosed link:
 

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Discussion Starter #3 (Edited)
Thanks Allan...I understand what you say but why is there in the owners manual the instruction to regurlarly remove the drain plug on the hose connected to the coffin airfilter on the right hand side to allow it to drain? Page 6-15 of the owners manual

252624
 

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Because there are two low points. One in the coffin box manually drained and one in the airbox "puke valve"
If you find significant oil in either you are probably running your oil level a little too high.
 

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Discussion Starter #5
Because there are two low points. One in the coffin box manually drained and one in the airbox "puke valve"
If you find significant oil in either you are probably running your oil level a little too high.
Thanx Sandy.....Haven't looked if there's oil or anything in the coffin box pipe yet but anyway my original question has still not been answered...the question was" How often is one supposed to pull the plug on the right side air cleaner (Coffin) drain tube to let accumulated water and oil blow residue out? And wouldn't it be easier to also just install a puke vent hose in place of the plugged system it has now? Has anyone done that?
 

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When Yamaha dealers do oil changes or air filter changes or work on top of the motor they check/drain the right side filter case and they use shop towels to wipe any vented oil out of the undertank airbox. It's in the shop tech manual if you ever get to see one. However, it's rare there is anything in the right-side filter housing.

I have no responses to the rest.
 
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