I guess there's plenty of compression or you'd have noticed with all that kicking! So that would rule out the wrong size piston or broken rings etc. You got the head on ok? Those o-rings can be devils. Also check the PV is assembled correctly and it isn't doing something daft like totally obscurring the exhaust port. Is it firing at all? Is any fuel getting ignited even if not enough to start?
Things that would be on my list of suspects would be anything electrical I had disconnected or possibly dislodged. Sometimes you can get a spark in the open air but it's too weak when under compression to ignite. It should drive a spark across a 1cm or more in the open air if you create a test rig. Forget the exact distance but sure you can Google it. Also if the rebuild took a while I've often been surprised by how much fuel can go off especially in a vented plastic tank.
Another classic schoolboy error, not that I've ever done it you understand, is leaving an exhaust bung in!
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