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If you oiled the pistons and rings up well when you assembled the engine, they will have a really good seal in the bores and give maximum compression.. Something that always makes a fresh engine a bit on the stiff side to start up. It might even have oiled the plugs up before getting a chance to fire?
It should start after a revolution or two, but if it has a vacuum fuel pump that might take quite a few revolutions for the fuel to get through and fill the bowls, so it will be dragging the battery down trying to prime it.. Did you check the battery condition?
Have you tried taking the plugs out and giving it a good spin over? That could tell you if the engine is stiff or just producing lots of compression. It will also help drag the fuel through, so you can try again with freshly charged battery and clean plugs.
Once it's started and run it will probably be fine.
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