The first thing that I would check is the crankcase breather system. There is supposed to be a hose that comes off of the valve cover to equalize the engine pressure. As the piston is going up and down, it creates both pressure and a vacuum in the crankcase. The hose from the valve cover is there to allow the engine pulses to escape and not pressurize the crankcase. However, if this hose gets blocked off, your crankcase can become pressurized and force oil out as you describe. So check this hose for blockage, kinks, etc.
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2005 Hammerhead 150
170cc BBK, PnP Big valve Head, A12 Cam, Uni Filter, Custom Exhaust, 10G rollers, 1500 Contra Spring, 2000 Clutch Springs
Just added - 2007 Joyner 250 SV - Let the fun begin
4-Dirt Bikes, Baja Bug and enough toys to keep me in the garage and out of trouble.
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