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Replacing any starter cord is usually a matter of removing the pull start assembly, pulling the cord until it is completely unwound, block the reel so it cannot retract, remove the old cord, (remember EXACTLY how it was connected), install a new cord, unblock the reel so it can retract, re-install the assembly.
It may be necessary to remove covers or engine shrouds to get to the pull start assembly. That's part of the fun of "do-it-yourself".
It sounds as though there is an issue with the carburetor. If the unit is "surging" with no load I would recommend thoroughly cleaning the carb. It would also be a good idea to test the fuel pump. Per Generac you need to disconnect the fuel line leading to the carb and pull the starter rope over to see if adequate fuel is flowing. If none of this is the issue try testing the stepper motor on top of the carb. If you unclip the wire and use an OHM meter all wires should test at 150 ohms. to test place on test lead on the blue wire and move the other lead to the remaining four wires. The should all ohm out to roughly 150ohms. if this is not the case you need to replace the stepper motor.... Before you do any of this you should check for fresh fuel, a good spark plug, and proper compression.
I have a Briggs & Stratton GENPOWER 11 generator that is electric start. The electric start will not start the motor or ever turn it over. I can turn the key on and jump across the terminals on the starter and it will run only if I continue to squirt starter fluid in the carb. My question is, if the ignition switch is bad, could that be the reason it will not stay running. My only guess is if the ignition switch is bad, the motor thinks it is in the off position at all times. Thanks, R Ray
This may sound over simplified but..... old battery cables corrode onboth ends so you have less amperage carried by the cables. (i.e. fewer strands of copper trying to carry more amperage than they are capable of. The next time you do a start cycle place your hands on the battery terminals one at a time and check to see if they are HOT to the touch. Also do the same thing for the chassis ground and the terminal lug at the starter. ANY hot terminal is a sign the cable has broke down either from age/vibration wear or corrosion. If you suspect the battery cables are bad get a VERY GOOD set of jumper cables (2 sets connected together if necessary) and do a direct from the battery to the starter connection. This is loads of amperage so be very careful and DO NOT do this alone. But, if the starter spins faster you have battery cable problems.
IF you have an external to the starter relay that too can cause the problem due to worn / defective contacts.
Is the oil sump full? Has it been run with out oil? You can do an amp draw test on the starter. Should be 60 amps or so. Can you roll the engine by hand? If engine turns free pull the starter out and bench test it with jumper cables. Positive cable to cable lug and negative cable on the starter case. Hang on to it, lots of torque. If the stater turns slow or gets hot it is probably bad.