First thing to check would be the battery terminal connections. If there is corrosion they will not deliver the amps to crank. A little corrosion will do it. They must be clean and tight. Good luck.
2 possible positions
1-- tdc both valves in overlap position
2--- tdc both valves have tappet clearance
what exactly are you asking here --valve timing
check for dots on crank and cam shaft gears
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indicates a problem with the float level or blocked needle and seat hole
if you require extra air flow into the ventury to suck up the fuel to start it , that indicates that the float level is set too low and there is not enough fuel in the bowl for the normal air flow to be able to suck up the fuel
Would also account for the primer bulb not being able o push the fuel up to get it to start
