I have a Generac MC 5500 portable generator. It

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replace the low oil level sensor pack
it controls spark

Judy, Generac portable generator oil recommendations. Above 40°F, use SAE 30. Below 40°F and down to 10°F, use 10W-30. Below 10°F, use synthetic 5W-30. Oil should be changed after the first 8 hours of operation and every 200 hours of run time thereafter.
Check the attached links,instruction and guides, Good luck
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http://www.generac.com/service-support/faqs/portable-generator-faqs

http://www.generac.com/service-support/faqs/home-backup-faqs

Best oil for Generac generator Lawn Mower and Small Engine Bob Is The Oil...

Generac Generator Oil Change

how to put it in or how to time it??????????????http://gens.lccdn.com/generaccorporate/media/library/content/all-products/portable-recreational-power/0180710sby-portable-full-line-catalog.pdf?ext=.pdf
http://gens.lccdn.com/generaccorporate/media/library/content/all-products/portable-recreational-power/gp%20series/0196610-a-gp5500.pdf?ext=.pdf
http://gens.lccdn.com/generaccorporate/media/library/content/all-products/portable-recreational-power/gp%20series/0h8902-rev-h_gp-warranty.pdf?ext=.pdf

Cleaned and adjust carburetor per Repair Manual. then adjust governor repair manual and should take care of problem on this old generator.

https://www.generator-parts.com/manuals/generac-rv/051834.pdf

The problem with the repair service is another matter. Emergency generator and it's switch gear are there for emergency purposes. It has to be exercised periodically. The switch gear should have a toggle switch to simulate a power outage. the switch cuts power to the sensor sensing power from the utility company. This tells the switch gear that power was lost, start the engine and switch over to generator power. Run for a period where engine reached running temperature and switch back to stand by to shut down. Do this periodically, and be grateful the event was not a disaster. Think of your back up electrical system as the spare tire of your car and similar equipment and enjoy your investment. Good people brings you happiness, bad people brings you experience !.

Check that there is not a switch to activate the panel. Next, there is a fuse for the outlet panel as well or a circuit breaker. Check that. If all of that is good you will have to put a meter on all of the wiring points from beginning to end and find out where the voltage stops. Then you have found the component that went bad.

make sure magneto is VERY close to the flywheel. Like, two pieces of paper close.

First you need to identify, is there a spark at the plugs? Is there fuel getting the cylinders, it can be so many things until you define at least that, the solutions are too many to list