06 gsxr 600

Ment to say... I never considered myself an auto guy. Mechanical inclined... meh maybe... but I build houses for a living never been in this deep. Splitting crank cases, new crankshaft. I thought I was in over my head. Until tonight... finally got her all back together. Minus fairings... and she cranked over. Didn't start. But just the fact she cranks... super stoked... but I have an issue... so I got some fuel in the tank and hooked it all up... ready to attempt to get her to run... welll as I was cranking, it wierd it just sorta slipped and no. More engine engagement... something is Def spinning but it ain't the engine. Can anyone help. K6 600