Oil and fuel filling air box up through breathing pipe

[Maffsticky]

Hi all I finally got my bandit 600 to run today but while it was running I was reving it quit hard and all of a sudden there was oil and fuel gushing out the air box so I whipped cover of the box and started it bk up again to find when reved it shoots loads of oil and fuel out through the breather pipe coming from the top of the head can someone please shed a little light on what it could be thanks maff
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M thomas

[Nobby the Bastard]

Head gasket is blown.

Probably not fuel but water...
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trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Sprint ST 1050

[Pete.]

[Nobby the Bastard]

Still the head gasket though. Nothing else could pressurise the sump to that extent.
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trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Sprint ST 1050

[stinkwheel]

Check the oil level to make sure it isn't full of fuel.

If the carb needle valves have been leaking, it could have leaked fuel into the sump.
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“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[Islander]

Float valves not sealing could dump fuel into the sump - that would pressurise things too. If it's oil and fuel that's where I'd be looking.

[jeffyjeff]

I think that high crankcase pressure is causing the oil/fuel to blow through the breather into the airbox. Loose piston fit and/or failed piston rings could result in blowby. Personally, your description of the problem leads me to believe you have a crack or hole in one of your pistons.
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History shows again and again how nature points out the folly of men - BOC

[Maffsticky]

[Maffsticky]

[stinkwheel]

[ThunderGuts]

I would imagine it'd be pretty obvious if it's petrol (or mostly petrol)? The only way I can think of that petrol can get into the engine like that is as above (I have suffered this), carb allowing a constant trickle of fuel past. As above (again) the simplest check is the oil level, assuming you did the last service, presumably you topped the oil to the "max" level but not above (or you've checked it and remember roughly where it was) - if it's leaking fuel into the oil then this level will be sky high, even after a "bit of venting". Incidentally, I wouldn't suggest turning over the engine again until you've diagnosed the issue. As Stinkwheel says, you can bend/break things very easily.
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TG.

[A100man]