My bike starts and goes fine then fails to restart

[Nahom]

So as title says I ride it nonstop for 5 mins and suddenly decide to turn throttle off and stop. But when I try to restart it it just doesn't start.
I realise I screwed up also by forgetting to put any engine oil with petrol. zippinaround helped show me that the cylinder and piston were now damaged and I will put new engine in.

1) Do you think this fiasco can damage any other parts of the bike like the carburettor which is connected to it?

However this problem started before I screwed up with no engine oil.

2)Is this restart problem common and what are the common causes?

I'd be really greatful for answers to 1) and 2).

 

[zippinaround]

did you check the magneto to see if that case is wet or even moist inside?

 

[Nahom]

I just opened it up to get the chain out from the old and about to replace it with the new engine. if the magneto is the coily yellow thing with the number written om it next to the crankshaft then I have not checked that no.
What happens if it's wet or moist?

 

[Anthony 4k]

Check for spark, clean carb,will it start choked?

 

[KTOKTO]

Is your gas cap venting?

 

[Nahom]

Is your gas gap venting?

Do you mean gas cap? If you do what do you mean by a cap venting- air is coming in and out beacause of a hole? how would I test for this please
It's too late to check this anyway I'm in the middle of changing too many components.