Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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It could be a blown head gasket, a crankcase breather assembly gone bad, an air leak from some other external source allowing air to enter the crankcase and develop a crankcase pressurization problem which would then blow oil out of the engine, the crankcase breather tube could be pinched causing a back pressure. So, in answer to your question, Yes, there are several other possible causes of your problem.
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The crankcase breather should be pretty easy to access, you should be able to follow the hose backwards from the air filter base over to it.
A DOHC engine will be a complicated project if you have to replace the head gaskets. Timing is everything when you put it back together.
Unfortunately, I don't have a manual for that one. I can't find anywhere online that they offer one for free download. I did find one place that offers an engine manual for sale and I am including that link here.
I hope that this helps you.