Generator Motor runs sloppy

[R134a]

I have a Briggs 01679 standby generator using a 570 v-twin motor # 354447 0122-e1. Speed wanders and sometimes backfires. This runs on propane. Anyone have a service manual / parts list for the fuel system ?:confused2:

 

[Industrial Toys]

I think my ex GFs mother has one of those. When I was there in the spring, it was out of service and has a speed control issue. Start, rev up and then would shut down, showing overspeed.

Curious if they have some common issue.

 

[R134a]

Doesn't stall. I'm thinking deteriorated carburator gasket(s) + ??? Documentation might save me some grief. Unit is likely 15 yrs old or more.

 

[Travelover]

Could be bad ignition or an air leak causing too lean condition. I'd start with a new spark plug and check the carb manifold gasket by squirting oil on it while running.

 

[R134a]

spark plugs and coils are fine. I'm going to take the carb off and take a look at everything. No doubt the gaskets are likely dry rotted.

 

[Industrial Toys]

It's not like it's a gasoline related issue. What governs speed on those?