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| Enduro Engine 4 stroke (including EFI & Exhaust) 4 stroke engine, EFI, and exhaust discussion |
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#1
03-17-2009, 09:10 AM
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Air box full of oil
I have a 05 FSE 450 if it sit for a week or more the oil drains out of tank and fills the crankcase full then flows through the breather hose into the air box.I routed a new new breather hose up over the head then down to airbox still same problem,but took about two weeks to get to airbox.Any ideas out there. Thanks
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#4
03-17-2009, 08:13 PM
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I'm surprised nobody has mentioned the obvious.... you just need to ride more, end of problem!
 Yeah, I would look for a check valve problem also. Are you going to the Desert 100 for the poker run or to race? That's your back yard.
__________________
jeff '00 XC250 (mine) LTS front and rear suspension, power valve cover, carb jet kit and rear chain glide, RB Designs head mod, BRP tall triple clamp, backyard foot-peg lowering conversion. '04 EC250 (the kids) (he can do his own mods haha!)
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#6
03-18-2009, 09:05 AM
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Because its a dry sump motor, the crank is not supposed to spin in an oil bath. Its pressure lubed from the pump and another pump (scavange pump) sucks up the oil and pumps it back into the frame resevoir. When the piston moves up and down the crankcase must vent through the breather, if there is too much oil in the crankcase it gets blown out the breather into the airbox. It doesn't fill the airbox as it sits, its when you start it after sitting awhile. If its designed to work with some oil draining back into the motor, could you have too much oil in the bike?
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#7
03-18-2009, 10:59 AM
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FYI... I read reports of Husky 610 riders experiencing this oil-in-airbox issue. It was from overfilling oil level. With proper oil fill, there was no issue.
Perhaps not your exact reason but something to consider.
__________________
Matt Current: 2009 Yamaha FZ1 Previous: 2001 GasGas TXT280, 2001 GasGas XC250, 2004 KTM 200EXC, 2007 GasGas EC250, 2007 Husqvarna SM610, 2008 Husqvarna WB165
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#8
04-01-2009, 07:28 PM
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Mine does the same.
I added the recommended 1800cc of oil.
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#10
04-02-2009, 07:09 PM
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I misswrote, 1200cc is the amount I put in. Every time I do a full oil and filter service.
Last edited by sanderjavant; 04-02-2009 at 10:04 PM.
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