125cc pit bike wont start has spark compression and fuel

[2fast4u2]

hey guys i bought a bike that didnt start from the begiining the bike has sparks, compression , and fuel i also checked timing it was on tdc and cam position at 9 oclock. the bikes flywheel has been swapped with an inner rotor kit from ebay. it has a strong spark blue aswell. i dont know whats wrong please help. the way i did tdc was that i shined a flash light down the spark plug tube and looked at the piston coming back up i put it on tdc and checked cam timing and it as at the 9 oclock position aswell please help. ive been trying to get it started for almost 3 days now no luck.