so i got this raptor 660 of my friend and all it needed was a camshaft. so i bought a new stock cam and ive put it back together. i lined the I mark on the flywheel through the hole on the side cover and lined the cam with the two punch marks level with the engine head and the one punch mark facing up. i have the cam lobes are facing down. I bought new gas and carbs are cleaner then a whistle. she turns over but wont fire. what am i doing wrong someone please help me ??