You are blowing water out 2 spark plug holes a lot only on one stroke?

Not sure what your question is, but this sounds serious. You will likely need to remove the heads to inspect for cracks. ANOTHER ANSWER That sounds like a blown head gasket. Have you run a compression test?

If a head gasket has failed it's because the head warped. You'll need to have the head resurfaced to get it back into condition BEFORE you try to put a new head gasket on.