This may or may not be the issue- only suggesting this as a possible thing to eliminate.
The FEV is needed for start up- it's function is to enrich the cold engine same as a choke by allowing more fuel less air- as the valve extends it opens the airway and exposes the main jets fuel source while closing off the enrichment orfices. The resistor is usually a ceramic block type fuse/resistor. It's usually located under the electrical cover on the swingarm. After seeing many used GY6 buggies and nearly always the resistor was removed or un-hooked. Members here on this forum have talked about a manual choke conversion but I have never persued this option. Just a note:
There may be 1 or 2 resistors- I never could read the resistance values
Without the FEV on a cold day you probably wouldn't be able to start it
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