trouble shoot OVER HEATING

Overheating can be caused by several issues. Low on coolant, leaks (internal or external), clogged radiator, bad thermostat, etc. Sounds like you have fixed one of the symptoms but not identified the root cause.

would the fuel jets be a problem

Sounds like you have done major work on the engine. Time to step back and verify all of the connections are properly re-connected. Then some basic troubleshooting. You have to start with some good old fashioned troubleshooting. Is the engine turning over (cranking)? If Yes, the battery and starter are good. Does it have spark? Pull a plug wire and test. If not, you have an ignition system problem. Does it have fuel? Starting fluid is the easiest way to check (remove air filter and spray a bit in to see if it starts).