Built up an engine a mate got cheap. Timed it up with the marks found online. Dots on sprockets to the top and drill bits at 6 o clock, pump marker lined up and pinned and crank pinned with the torx in the front of the crank around 11 o'clock. Because the engine is an unknown quantity I don't to stick it on to find its goosed. Compression sounds good and I can get it turn over quickly on the deck but can't get it to fire off easy start. Any ideas? Massively stuck so any ideas would be good.