G'day Bumps,
The carby adjustment knob only affects the idle speed setting. The governed speed adjustment is the governor vacuum tube connector [Victa: vacuum control button] on the cowl - it is rotated to adjust the speed.
Victa's recommended governed speed range is pretty broad anyway; 3500-3800 rpm for catcher models; 3500-4200 for non-catcher.
For the G4 carby only, note the jet/tube installation instructions in the Service Bulletins - these carbies will run rich if the tube is bottomed in the jet, before it's screwed in. The springs don't influence the mixture.
Cheers,
Gadge
"ODK Mods can explain it to you, but they can't understand it for you..."
"Crazy can be medicated, ignorance can be educated - but there is no cure for stupid..."
| 
