well you are correct. thers 2 timing mars that we didnt notice the first time that thers 2 timing marks... theres one to set the piston at cyl 1 at tdc and 1 to set it at bdc. so on our next attempt we set it to tdc and still nothing. when it cranks over it kinda sounds like the when the starter goes bad and all it does is spin, but everything is turning (water pump, both cams, crank, and tensioner.) its got PLENTY of spark, and its got fuel.