Yes it would.
timing could be off. Bad spark plugs, crossed wires bad coil. Lots of things.
Yes.
The chain can not backfire. If it is installed off time it can cause a backfire, which could conceivably damage a starter.
engine backfire during cranking.
If by "popping noise" you mean backfire, it could be crossed ignition wires, or some sort of misfire.
timing is off or firing order is off
Out of time, or spark plug wires installed on wrong plug.
you probablly have the spark plug wires crossed. check ur firing order and your new plugs. the firing order is on the intake usually by the thermostat.
Out of time. Possibly worn cam chain has jumped a tooth.
No. A worn timing chain or belt would cause timing to jump.
A motorcycle jerk or backfire can come from the choke not shutting off completely, the fuel jets might be clogged, a gasket or seal may be broken. Valves that are out of adjustment could also be the problem.
Several things could make a carburetor backfire. The engine could be out of time. the carburetor could have a stuck float, or the engine could have a stuck valve.