Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Trying to understand your problem... Your unit will not start with electric start? like the battery is not being charged?
Full model number of the Briggs engine? 850 is a series not a model number. Twin engine? Is there an electric solenoid in the base of the carburetor? Does it click if the key is turned on and off?
Spark plug gap should be 035 inch.