I would need the info off the engine (model and type numbers) as the serial number posted just comes with the SVCS466 Victa mower and Briggs Power Portal here only lists the operator manual for that consumer walk behind.
I do know on that plastic the bowl screws are not to be over-tighten or they will strip out. I done had to replace one because owner strip them out, Other they are simple to maintain even though do clog easily from bad fuel.
It does appear it is a 09P6 series and that you are missing the governor spring.
